Changes between Version 66 and Version 67 of UvmatHelp


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Timestamp:
Jun 13, 2013, 11:55:32 AM (7 years ago)
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sommeria
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  • UvmatHelp

    v66 v67  
    1 = Help for Uvmat =
     1= --- Help for Uvmat --- =
    22[[TracNav]]
    33
     
    332332In summary, the ''field structure'' is specified by the following elements:
    333333
    334  * (optional) '''!ListGlobalAttribute:''' list (cell array of character strings) of the names of global attributes  Att_1, Att_2...
    335  * (mandatory) '''!ListVarName:''' list of the variable names Var_1, Var_2....(cell array of character strings).
    336  * (mandatory) '''!VarDimName:''' list of the dimensions associated with each variable: this is a cell array whose number of element is equal to that of '''!ListVarName'''. Each element is the dimension name for a unidimensional variable, or a cell array specifying the list of dimension names for a multidimensional variable.
    337  * (optional) '''!VarAttribute:''' cell array of structures of the form !VarAttribute{ivar}.key=value, defining an attribute tag name and value for the variable #ivar (variable number in the list !ListVarName]).
     334 * (optional) '''ListGlobalAttribute:''' list (cell array of character strings) of the names of global attributes  Att_1, Att_2...
     335 * (mandatory) '''ListVarName:''' list of the variable names Var_1, Var_2....(cell array of character strings).
     336 * (mandatory) '''VarDimName:''' list of the dimensions associated with each variable: this is a cell array whose number of element is equal to that of '''ListVarName'''. Each element is the dimension name for a unidimensional variable, or a cell array specifying the list of dimension names for a multidimensional variable.
     337 * (optional) '''VarAttribute:''' cell array of structures of the form !VarAttribute{ivar}.key=value, defining an attribute tag name and value for the variable #ivar (variable number in the list !ListVarName]).
    338338 * .Att_1, Att_2... : values of the listed global attributes.
    339339 * .Var_1, .Var_2...: variables arrays whose names are listed in !ListVarName.
     
    341341In some cases, it is useful to define the field object independently from its data content. Then the variables .Var1... are replaced by the lists of dimension names and values.
    342342
    343  * '''!ListDimName:''' list of dimension names (cell array of character strings)
    344  * '''!DimValue:''' array of dimension values corresponding to !LisDimName.
     343 * '''ListDimName:''' list of dimension names (cell array of character strings)
     344 * '''DimValue:''' array of dimension values corresponding to !LisDimName.
    345345
    346346The following temporary information is added to manage projection and field substraction oerations, which must be done in general after projection:
     
    415415== 6 - Projection objects == #ProjObject
    416416=== 6.1 Definition and editing with the uvmat interface ===
    417 These are geometrical objects used to define cuts along lines or planes, to interpolate fields on a regular grid, to restrict the analysis or visualisation to field subregions. When a 2D or 3D field is opened by uvmat, a default projection plane object is created. New objects are created by the menu bar command  '''[Projection object]''' in '''uvmat.fig'''.  The creation of a new object ('''points''', '''line'''....) can be initiated by selecting the corresponding item in the menu. Alternatively, an existing xml object file can be opened by selecting the menu option '''[browse...]'''.
    418 
    419 In each case an auxiliary GUI '''set_object.fig''' describing the object properties appears, see next [#a6.2Objectproperties sub-section] for their definitions. This GUI can be directly edited and object coordinates can be set by mouse drawing on the plot. In the latter case, refresh the plots by pressing''' [PLOT] ''' in '''set_object.fig''' . Objects can be saved as xml files with the button ''' [SAVE]''' of '''set_object.fig'''.
    420 
    421 The projection of fields on objects is performed by the function ''proj_field.m'', which can be used also in data processing. The projected field from a projection object drawn in the main plotting window of uvmat will be plotted in the secondary plotting GUI '''view_field.fig'''. The list of currently opened projection objects is displayed in the menus '''[!ListObject]''' and '''[!ListObject_1]''' at the bottom right of '''uvmat.fig'''.  One object can be selected in each of these menus: the projection on the object selected in '''[!ListObject]''' is viewed in '''uvmat.fig''' while that of the object selected in '''[!ListObject_1]''' is viewed in '''view_field.fig'''. All the created objects are sketched in both views, except the one generating the currently plotted field (see [subsection 6.4->#sec6.4] for object representation). The active objects are plotted in magenta, while the inactive ones are in blue.
    422 
    423 Objects can be viewed, edited, deleted...Also extracted as a Matlab structure using the menu bar command '''[Export]'''.
     417These are geometrical objects used to define cuts along lines or planes, to interpolate fields on a regular grid, to restrict the analysis or visualisation to field subregions. The projection of fields on objects is performed by the function ''proj_field.m'', which can be used as well in data processing outside the GUI '''uvmat''', using for instance [#a10-Processingfieldseries series.fig]).
     418
     419When a 2D or 3D field is opened by '''uvmat;fig''', a default projection object called 'plane' is created, so that all field plots (in 2D and 3D) are considered as the result of a projection. New objects are created by the menu bar command  '''[Projection object]''' in '''uvmat.fig'''.  The creation of a new object ('''points''', '''line'''....) can be initiated by selecting the corresponding item in the menu. Alternatively, an existing xml object file can be opened by selecting the menu option '''[browse...]'''. In each case an auxiliary GUI '''set_object.fig''' describing the object properties appears, see next [#a6.2Objectproperties sub-section] for their definitions. This GUI can be directly edited and object coordinates can be set by mouse drawing on the plot, see [#a6.4Objectrepresentation section 6.4]. To validate edition on the GUI '''set_object.fig''', refresh the plots by pressing '''[REFRESH]'''. Objects can be saved as xml files with the (upper right) button '''[SAVE]''' of '''set_object.fig'''.
     420
     421The names of the created objects are listed in the menu '''[!ListObject]'''. The properties of the object selected in this menu can be viewed by activating the check box '''[CheckViewObject]'''. Check '''[CheckEditObject]''' to allow object editing with '''set_object.fig'''.  The selected object is plotted in magenta, while the inactive ones are in blue. The field plot resulting from projection can be viewed in the GUI view_field.fig by activating '''[CheckViewField]'''. This option is automatically selected when a new object is created. Then the projection object used for the main plotting window in uvmat can be selected by the menu '''[!ListObject_1]''' which reproduces the list of available objects. The active objects are plotted in magenta, while the inactive ones are in blue.The object can be deleted by pressing '''[DeleteObject]'''.
     422
     423The properties of the projection objects can be extracted as a Matlab structure using the menu bar command '''[Export/field in workspace]''' of '''uvmat.fig'''. Those are contained in the cell of structures ''Data_uvmat.ProjObject''.
    424424
    425425=== 6.2 Object properties ===
     
    482482
    483483=== 6.4 Object representation ===
    484 Projections objects are drawn in magenta color when they are selected for creation or edition, and in blue otherwise.
    485484
    486485 * 'points' are represented by dots surrounded by a dashed circle showing the range of projection.
    487  * 'line' , 'polyline' are plotted as lines, surrounded by two dashed lines showing the range of projection, when applicable (i.e. not in the case !ProjMode='interp').
    488  * 'polygon', 'rectangle', 'ellipse' are drawn. In the case ProjMode ='inside' or 'outside' the corresponding area is painted in magenta (or blue when they are not selected).
    489  * 'plane' are shown by their axis. These axis are limited to their range of selection  (RangeX and RangeY) when applicable. Otherwise they end at the edge of the figure with an arrow. **
     486 * 'line' , 'polyline' are plotted as lines, surrounded by two dashed lines showing the range of projection, when applicable (i.e. not in the case !ProjMode='interp...').
     487 * 'polygon', 'rectangle', 'ellipse' are drawn as lines. In the case !ProjMode ='inside' or 'outside' the corresponding area is painted in magenta (or blue when they are not selected).
     488 * 'plane' are shown by their axis ending with arrows. When the projection is limited to a sub-domain, by [RangeX] or [RangeY], the bounds are indicated by dashed lines.
    490489 * 'volume' are shown like 'plane', except that they are painted in magenta (or blue) **
    491490
    492 -''' {Creating and editing objects with the mouse:} '''
    493 
    494   Object can be interactively drawn with the mouse on the GUI '''uvmat.fig ''' . First activate the creation mode by selecting the appropriate item in the menu bar Tools.
    495 
    496  * 'points': mark points with mouse left button. Use right click to end the series. The list of coordinates appear on the set_object interface.  These can be then manually edited, use plot on the GUI '''set_object.fig''' to validate. The range of action  can be set on the GUI '''set_object.fig''' by the edit box '''[YMax] ''' (only needed in the ProjMode 'projection'). This range is visualised by dashed circles around each point. The set of points can be determined from successive images (to track a feature for instance): for that purpose use the keyboard keys 'p' and 'm' to increament or decrement fields  without the mouse.
    497  * 'line': just draw a line, keeping the mouse left button pressed, release to end. The range of action, set by '''[YMax]''', is visualised by two dashed lines (only if ProjMode='projection').
    498  * 'polyline': draw a line with several segments, press and release the mouse left button to mark each summit, press the right button to end the line.
    499  * 'rectangle': defined by its center, half width and half height.
    500  * 'polygon': closed line made of n consecutive segments (defined by n points)
    501  * 'ellipse': defined by its center, half width and half height.
    502  * 'plane': plane with associated cartesian coordinates
    503  * 'volume': volume with associated cartesian coordinates
     491Object can be interactively drawn with the mouse on the GUI '''uvmat.fig ''' . First activate the creation mode by selecting the appropriate item in the menu bar Tools, and possibly adjust parameters on the GUI '''set_object.fig'''. Then mark the set of point coordinates by pressing (then release) the left mouse button. Those appear in the table '''[Coord]''' of '''set_object.fig'''. For 'polyline' or 'polygon', press the right hand mouse button to end the line. 'Plane' and 'volume' cannot be created or modified with the mouse.
     492
     493In edit mode, the position of each defining point can be adjusted with the mouse: press the left button and maintain it to drag the point. The object can be similarly translated by selecting a defining line.
     494
    504495-----------------
    505496== 7 - Netcdf files and the GUI get_field ==
     
    528519
    529520=== 7.2 The GUI get_field ===
    530 This GUI '''get_field.fig''' is aimed at browsing a NetCDF file, showing all its variables, attributes and variable dimensions. Variables can be selected for input in '''uvmat''' or '''series'''. The GUI is opened by selecting the option '''get_field...''' in the menu '''[FieldName]''' of '''uvmat''' or '''series'''. This option is automatically selected when the input NetCDF file is not recognised as CIV data.
     521This GUI '''get_field.fig''' is aimed at browsing a NetCDF file, showing all its variables, attributes and variable dimensions. Variables can be selected for input in '''uvmat''' or '''series'''. The GUI is opened by selecting the option '''get_field...''' in the menu '''[!FieldName]''' of '''uvmat''' or '''series'''. This option is automatically selected when the input NetCDF file is not recognised as CIV data.
    531522
    532523<doc62|center>
    533524
    534 When a NetCDF input file opened, its full name, including path, is displayed in the upper window '''[inputfile]'''. The names and value of the global attributes are listed in the left column '''[attributes]''', the list of variables in the central column '''[variables]''', and the list of dimension names and values in the right column '''[dimensions]'''. By selecting one of the variables in the central column, the corresponding variable attributes and dimensions are displayed in the left and right columns respectively. Note that the whole content of the Netcdf file can be obtained by the function ''nc2struct.m''. Input fields can be selected according to three options, chosen by the menu '''[FieldOption]'''.
     525When a NetCDF input file opened, its full name, including path, is displayed in the upper window '''[inputfile]'''. The names and value of the global attributes are listed in the left column '''[attributes]''', the list of variables in the central column '''[variables]''', and the list of dimension names and values in the right column '''[dimensions]'''. By selecting one of the variables in the central column, the corresponding variable attributes and dimensions are displayed in the left and right columns respectively. Note that the whole content of the Netcdf file can be obtained by the function ''nc2struct.m''. Input fields can be selected according to three options, chosen by the menu '''[!FieldOption]'''.
    535526
    536527-'''1D plot:''' to plot a simple graph, ordinate versus abscissa. Select by the menu '''[ordinate]''' the variable(s) to plot as ordinate (use the key '''Ctrl''' for multiple selection). Then select the corresponding abscissa in the column '''[abscissa]'''.  If the variable is indexed with more than one dimension, each component is plotted versus the first index (like with the plot Matlab function ''plot.m''). If the option '''[matrix index]'''('''[CheckDimensionX]''') is selected, the ordinate variable is plotted versus its index.
     
    540531-'''vectors:''' to plot vector fields. The x and y vector components are selected in the first (...) and second columns, while the coordiantes are selected in '''[coord_x_vector] ''' and '''[coord_y_vector]'''. If no variable is selected in '''[coord_x_scalar] '''  or '''[coord_y_scalar] ''' ( blank selected at first line), the index is used as coordinate. A scalar, set in ..., can be represented as vector color.
    541532
    542 The attribute or variable considered as 'time' can be also chosen in the Panel '''[Time]'''. From the menu '''[SwitchVarIndexTime]''', the time can be considered as the ''file index'', a global ''attribute'', a dimension ''variable'', or a ''dimension index''. Selection of ''attribute'' gives way to a list of global attribute tags in the menu '''[TimeName]'''. Selection of variable gives way to a list of vartiables, while selection of ''dimension'' gives a list of dimension names.
     533The attribute or variable considered as 'time' can be also chosen in the Panel '''[Time]'''. From the menu '''[!SwitchVarIndexTime]''', the time can be considered as the ''file index'', a global ''attribute'', a dimension ''variable'', or a ''dimension index''. Selection of ''attribute'' gives way to a list of global attribute tags in the menu '''[!TimeName]'''. Selection of variable gives way to a list of vartiables, while selection of ''dimension'' gives a list of dimension names.
    543534
    544535In the case of a 3D input field, the fig is set to uvmat. A middle plane of cut is automatically selected. This can be moved then with the slider on the interface set_object (see section 5). The default cuts are made at constant z coordiante, but any of the three initial coordiantes can be used as z coordinate, using the menu coord_z.
     
    563554
    564555=== 8.2 The GUI geometry_calib.fig} ===
    565 -''' {Opening the GUI:} ''' it is made visible  from the GUI '''uvmat.fig''' by  the menu bar command '''[Tools/Geometric calibration] '''.  If calibration data already exist in the current file <code>ImaDoc </code>, the corresponding list of reference points is displayed  in the central window '''[ListCoord] ''' of '''geometry_calib.fig'''. The three first columns indicate the physical coordinates and the two last ones the corresponding image coordinates. Calibration points can be alternatively introduced by opening any <code><ImaDoc></code> xml file with the menu bar command''' [Open] ''' of '''geometry_calib.fig'''.
    566 
    567 -''' {Plotting calibration points:} ''' press the menu bar command button '''[Plot] ''' to visualise the list of calibration points. The physical or image coordinates will be used in the list '''[ListCoord]''', depending on the option 'phys' or 'px' in the menu '''[transform_fct]''' of ''' uvmat.fig''' .
    568 
    569 -''' {Appending  calibration points with the mouse:} ''' Calibration points can be manually picked out by the mouse (left button click) after a calibration image has been opened by '''uvmat.fig''' (with the option '' or 'px' in the popup menu '''[transform_fct]'''), and the option '''[mouse_active]''' (at the very bottom) has been selected. Zoom can be used to improve the precision, but must be desactivated for mouse selection (then move across the image by the key board directional arrows). The coordinates in pixel of the selected points get listed in the box '''[ListCoord]''' of '''geometry_calib.fig'''. A calibration point can be later adjusted by selecting it with the mouse and moving it while pressing the left mouse button. Points can be accumulated from several images (use the key board short cuts 'p' and 'm' to move in the image series without monopolising the mouse).''
    570 
    571 -''' {Editing the  coordinates:} '''
     556-''' Opening the GUI: ''' it is made visible  from the GUI '''uvmat.fig''' by  the menu bar command '''[Tools/Geometric calibation] '''.  If calibration data already exist in the current file <code>ImaDoc </code>, the corresponding list of reference points is displayed  in the central window '''[!ListCoord] ''' of '''geometry_calib.fig'''. The three first columns indicate the physical coordinates and the two last ones the corresponding image coordinates. Calibration points can be alternatively introduced by opening any <code><!ImaDoc></code> xml file with the menu bar command''' [Open] ''' of '''geometry_calib.fig'''.
     557
     558-''' Plotting calibration points: ''' press the menu bar command button '''[Plot] ''' to visualise the list of calibration points. The physical or image coordinates will be used in the list '''[!ListCoord]''', depending on the option 'phys' or 'px' in the menu '''[transform_fct]''' of ''' uvmat.fig''' .
     559
     560-''' Appending  calibration points with the mouse: ''' Calibration points can be manually picked out by the mouse (left button click) after a calibration image has been opened by '''uvmat.fig''' (with the option 'blank' in the popup menu '''[transform_fct]'''), and the option '''[mouse_active]''' (at the very bottom) has been selected. Zoom can be used to improve the precision, but must be desactivated for mouse selection (then move across the image by the key board directional arrows). The coordinates in pixel of the selected points get listed in the box '''[!ListCoord]''' of '''geometry_calib.fig'''. A calibration point can be later adjusted by selecting it with the mouse and moving it while pressing the left mouse button. Points can be accumulated from several images (use the key board short cuts 'p' and 'm' to move in the image series without monopolising the mouse).''
     561
     562-''' Editing the  coordinates: '''
    572563
    573564For editing the physical coordinates of a calibration point, select it in the list '''[ListCoord]''', and use the edit boxes '''[XObject]''', '''[YObject]''', '''[ZObject] ''' (for 3D calibration). The image coordinates can be also edited by '''[XImage]''', '''[YImage]''', although they are preferably set directly by the mouse. Type 'return carriage' to validate the edition. The reference point can be suppressed by typing the 'backward' arrow on the key-board, or by filling the five boxes with blank values.
    574565
    575 -''' {Creating a physical grid:} ''' This tool '''[Tools/Create grid]''' in the  menu bar command provides the whole set of physical coordinates of a cartesian grid, after all their image coordinates have been picked out by the mouse. In the  GUI '''Create_grid.fig''' which appears, set the first and last x and y values and the meshes for the physical grid corresponding to the points already selected by the mouse. The physical coordinates of all the grid points then appears on '''[ListCoord]'''.
    576 
    577 -''' {Detecting a physical grid:} ''' This tool '''[Tools/Detect grid]''' provides the same result as '''[Tools/Create grid]''', but it automatically recognises the grid points on the image, provided the four corners of the grid have been previously selected by the mouse. The calibration points are detected either as image maxima (option 'white markers'), or as black crosses (option 'black markers'). Their position can be adjusted by selection with the mouse.
    578 
    579 -''' {Translation and rotation of calibration points:} '''
     566-''' Creating a physical grid: ''' This tool '''[Tools/Create grid]''' in the  menu bar command provides the whole set of physical coordinates of a cartesian grid, after all their image coordinates have been picked out by the mouse. In the  GUI '''Create_grid.fig''' which appears, set the first and last x and y values and the meshes for the physical grid corresponding to the points already selected by the mouse. The physical coordinates of all the grid points then appears on '''[ListCoord]'''.
     567
     568-''' Detecting a physical grid: ''' This tool '''[Tools/Detect grid]''' provides the same result as '''[Tools/Create grid]''', but it automatically recognises the grid points on the image, provided the four corners of the grid have been previously selected by the mouse. The calibration points are detected either as image maxima (option 'white markers'), or as black crosses (option 'black markers'). Their position can be adjusted by selection with the mouse.
     569
     570-''' Translation and rotation of calibration points: '''
    580571
    581572A translation or rotation (in physical space) can be introduced by the menu bar commands '''[Tools/Translate points]''' and '''[Tools/Rotate points]'''.  In the case of rotation, the origin of the rotation, as well as the angle (in degree) must be introduced. The resulting coordinates appear in the list '''[ListCoord]'''.
    582573
    583 -''' {Recording calibration parameters:} '''
     574-''' Recording calibration parameters: '''
    584575
    585576Once the list of calibration points has been completed, press '''[APPLY]''', after selecting the appropriate option in '''[calib_type]'''. (see the previous sub-section 7.1). Note that the more advanced Tsai options  require a sufficient number of calibration points (typically > 10) spread over the image. Calibration coefficients are recorded in the xml file <code><ImaDoc> </code> associated with the image currently opened by uvmat. If previous calibration data already exist, the previous xml file is updated, but  the original one is preserved with the extension .xml~.  If no xml file already exists, it is created. The image transformation to phys coordinates can be directly seen on the '''uvmat.fig''' interface after completion of the command '''[APPLY]'''.
     
    592583The coefficients are recorded in the xml element <code><ImaDoc/GeometryCalib></code> as follows:
    593584
    594  * <CalibrationType>: type of calibration ('rescale', 'linear', '3D...')
     585 * <!CalibrationType>: type of calibration ('rescale', 'linear', '3D...')
    595586
    596587 * <fx_fy>: focal length along each coordinate of the image sensor, expressed in pixel interval.
     
    600591 * <kc>: coefficient of quadratic deformation (=1 for the options calib_lin and calib_rescale)
    601592
    602  * <CoordUnit>: coordinate unit in physical space.
     593 * <!CoordUnit>: coordinate unit in physical space.
    603594
    604595 * <Tx_Ty_Tz></code>: translation, (Tz=1 for the options calib_lin and calib_rescale)
     
    653644The processing function is chosen in the menu '''[!ActionName]'''. The first option ''check_data_files'' lists the selected input file series and checks their existence. This is a good first test before starting a processing operation since all actions operate on the same input file series. The option ''aver_stat'' calculates  a global average on the successive fields, while ''time_series'' provides a time series. The option ''merge_proj'' is used to project a whole series on a given grid, or to create a file series by concatenation of different fields. These processing functions are described with more details in next sub-sections. The option ''civ_series'' gives access to the PIV processsing, see section [#a11PIV:ParticleImagingVelocimetry section 11].  Finally any additional function can be called and included in the menu by selecting the option ''more...'' . The corresponding path is displayed in '''!ActionPath'''.
    654645
    655 The action function is first activated when it is selected in the menu '''[ActionName]'''. This first activation checks input data and sets the visibility of input GUI uicontrols.
     646The action function is first activated when it is selected in the menu '''[!ActionName]'''. This first activation checks input data and sets the visibility of input GUI uicontrols.
    656647
    657648The actual start of the processing is triggered by pressing the button '''[RUN]'''. It can be run in local mode, i.e. on the current Matlab session, or as ''background'', by selecting this option in '''!RunMode'''. In mode ''background'', calculation is performed in a new Matlab session (without graphics) so that the current Matlab session is free for new operations. If a cluster system has been detected, a third option ''cluster'' appears in the menu, allowing to dispatch parallel computations on a computer cluster. For the latter option, a compiled version of the action function is useful, to avoid installing Matlab on each node of the cluster. This is achieved by selecting the option ''.sh'' in the menu '''!ActionExt'''. If the compiled version is not yet available, or outdated, the GUI proposes a new compilation of the selected function (launching the function ''compile.m'').
     
    659650The series of file indices is set in the frame '''[!IndexRange]'''. Any action is performed from field index '''[num_first_i]''' to '''[num_last_i] ''' with increment '''[num_incr_i]''' . If this increment is empty (or not an integer number), operation is performed on all available files between ''first_i'' and ''last_i''. In case of double indexing, action is similarly performed from field index''' [num_first_j]''' to '''[num_last_j]''' with increment '''[num_incr_j]'''. Succesive file names are ordered as a matrix {j,i} with the index j varying the fastest. The box '''num_NbSlice''' can be introduced to scan the ''i'' index modulo !NbSlice.
    660651
    661 When input files are indexed by pairs i1-i2 or j1-j2, as resulting from PIV, the pair indexing is chosen by the panel '''[Set Pairs]'''. The popup menu [mode] provides the choice between 'bursts', 'Di','Dj'. In mode 'bursts' a single j index pair is selected in the menu '''[ListPairs]'''. In mode 'Di' and 'Dj' it selects a given index interval in i or j respectively. Then the first_i and last_i refer to the ''reference indices''. With the option '*-*' in '''[!ListPairs]''', available pairs are automatically chosen. In case of multiple input lines, the selection from '''[Set pairs]''' refers to the line number displayed in [ListView]. It is  transfered to the corresponding line in the table '''[PairString]'''.
     652When input files are indexed by pairs i1-i2 or j1-j2, as resulting from PIV, the pair indexing is chosen by the panel '''[Set Pairs]'''. The popup menu [mode] provides the choice between 'bursts', 'Di','Dj'. In mode 'bursts' a single j index pair is selected in the menu '''[!ListPairs]'''. In mode 'Di' and 'Dj' it selects a given index interval in i or j respectively. Then the first_i and last_i refer to the ''reference indices''. With the option '*-*' in '''[!ListPairs]''', available pairs are automatically chosen. In case of multiple input lines, the selection from '''[Set pairs]''' refers to the line number displayed in [ListView]. It is  transfered to the corresponding line in the table '''[!PairString]'''.
    662653
    663654The velocity type and field are automatioally chosen by default, but can be specified by the menus '''[!VelType]''' and '''[!FieldName]'''. In case of multiple input file series, these menus only refer to the first line. Then the menus '''[!VelType_1]''' and '''[!FieldName_1]''' refer to the second line, consistently with the input for the GUI '''uvmat'''.