source: trunk/src/calc_field_interp.m @ 980

Last change on this file since 980 was 977, checked in by g7moreau, 4 years ago
  • Update Copyright 2008-2017 notice
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1%'calc_field_interp': calculate fields (velocity, vort, div...) using linear interpolation if requested
2%---------------------------------------------------------------------
3% [VarVal,ListVarName,VarAttribute,errormsg]=calc_field_interp(Coord,Data,FieldName,XI,YI)
4%
5% OUTPUT:
6% VarVal: array giving the values of the calculated field
7% ListVarName: corresponding list of variable names
8% VarAttribute: corresponding list of variable attributes, each term #ilist is of the form VarAttribute{ilist}.tag=value
9%
10% INPUT:
11% Coord(nbpoints,2): matrix of x,y coordinates of the input data points
12% Data: inputfield structure
13% FieldName: string representing the field to calculate, or cell array of fields (as displayed in uvmat/FieldName)
14% XI, YI: set of x and y coordinates where the fields need to be linearly interpolated,
15%        if XI, YI are missing, there is no interpolation (case of colors in vector plots)
16
17%=======================================================================
18% Copyright 2008-2017, LEGI UMR 5519 / CNRS UGA G-INP, Grenoble, France
19%   http://www.legi.grenoble-inp.fr
20%   Joel.Sommeria - Joel.Sommeria (A) legi.cnrs.fr
21%
22%     This file is part of the toolbox UVMAT.
23%
24%     UVMAT is free software; you can redistribute it and/or modify
25%     it under the terms of the GNU General Public License as published
26%     by the Free Software Foundation; either version 2 of the license,
27%     or (at your option) any later version.
28%
29%     UVMAT is distributed in the hope that it will be useful,
30%     but WITHOUT ANY WARRANTY; without even the implied warranty of
31%     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
32%     GNU General Public License (see LICENSE.txt) for more details.
33%=======================================================================
34
35function [VarVal,ListVarName,VarAttribute,errormsg]=calc_field_interp(Coord,Data,FieldName,XI,YI)
36
37%% initialization
38VarVal={};
39ListVarName={};
40VarAttribute={};
41errormsg='';
42InputVarList={};
43if ischar(FieldName),FieldName={FieldName};end
44check_skipped=zeros(size(FieldName));% default, =1 to mark the variables which can be calculated
45check_interp=ones(size(FieldName));% default, =1 to mark the variables which can be interpolated (not ancillary)
46Operator=cell(size(FieldName));
47
48%% analyse the list of input fields: needed variables and requested operations
49for ilist=1:numel(FieldName)
50    Operator{ilist}='';%default empty operator (vec, norm,...)
51    r=regexp(FieldName{ilist},'(?<Operator>(^vec|^norm|^curl|^div|^strain))\((?<UName>.+),(?<VName>.+)\)$','names');% analyse the field name
52    if isempty(r) % no operator: the field name is a variable itself
53        ivar=find(strcmp(FieldName{ilist},Data.ListVarName));
54        if isempty(ivar)% the requested variable does not exist
55            check_skipped(ilist)=1; %variable not found
56        elseif isempty(find(strcmp(FieldName{ilist},InputVarList), 1));% the variable exists and has not been already selected
57            if exist('XI','var')&& isfield(Data.VarAttribute{ivar},'Role') &&...
58                    (strcmp(Data.VarAttribute{ivar}.Role,'ancillary')||strcmp(Data.VarAttribute{ivar}.Role,'warnflag')||strcmp(Data.VarAttribute{ivar}.Role,'errorflag'))
59                check_interp(ilist)=0; % ancillary variable, not interpolated ?????
60                check_skipped(ilist)=1; %variable not used
61            else
62                InputVarList=[InputVarList FieldName{ilist}];% the variable is added to the list of input variables
63            end
64        end
65    else
66        if ~isfield(Data,r.UName)||~isfield(Data,r.VName)%needed input variable not found
67            check_skipped(ilist)=1;
68        elseif strcmp(r.Operator,'curl')||strcmp(r.Operator,'div')||strcmp(r.Operator,'strain')
69            Operator{ilist}=r.Operator;
70            switch r.Operator
71                case 'curl'% case of CivX data format
72                    if ~isfield(Data,'DjUi'), errormsg='field DjUi needed to get curl through linear interp: use ProjMode=interp_tps'; return; end
73                    UName{ilist}='vort';
74                    Data.vort=Data.DjUi(:,1,2)-Data.DjUi(:,2,1);
75                case 'div'
76                    if ~isfield(Data,'DjUi'), errormsg='field DjUi needed to get div through linear interp: use ProjMode=interp_tps'; return; end
77                    UName{ilist}='div';
78                    Data.div=Data.DjUi(:,1,1)+Data.DjUi(:,2,2);
79                case 'strain'
80                    if ~isfield(Data,'DjUi'), errormsg='field DjUi needed to get strain through linear interp: use ProjMode=interp_tps'; return; end
81                    UName{ilist}='strain';
82                    Data.strain=Data.DjUi(:,1,2)+Data.DjUi(:,2,1);
83            end
84            InputVarList=[InputVarList UName{ilist}]; %the variable is added to the list if it is not already in the list
85        else % case  'norm' for instance
86            UName{ilist}=r.UName;
87            VName{ilist}=r.VName;
88            if isempty(find(strcmp(r.UName,InputVarList)));
89                InputVarList=[InputVarList UName{ilist}]; %the variable is added to the list if it is not already in the list
90            end
91            if isempty(find(strcmp(r.VName,InputVarList), 1));
92                InputVarList=[InputVarList VName{ilist}]; %the variable is added to the list if it is not already in the list
93            end
94            Operator{ilist}=r.Operator;
95        end
96    end
97end
98
99%% create interpolator for each variable to interpolate
100if exist('XI','var')
101    for ilist=1:numel(InputVarList)
102        F.(InputVarList{ilist})=TriScatteredInterp(Coord,Data.(InputVarList{ilist}),'linear');
103    end
104end
105
106%% perform the linear interpolation for the requested variables
107for ilist=1:numel(FieldName)
108    if ~check_skipped(ilist)
109        nbvar=numel(ListVarName);
110        switch Operator{ilist}
111            case 'vec'
112                if exist('XI','var')
113                    if check_interp(ilist)
114                    VarVal{nbvar+1}=F.(UName{ilist})(XI,YI);
115                    VarVal{nbvar+2}=F.(VName{ilist})(XI,YI);
116                    end
117                else
118                    VarVal{nbvar+1}=Data.(UName{ilist});
119                    VarVal{nbvar+2}=Data.(VName{ilist});
120                end
121                ListVarName{nbvar+1}=UName{ilist};
122                ListVarName{nbvar+2}=VName{ilist};
123                VarAttribute{nbvar+1}.Role='vector_x';
124                VarAttribute{nbvar+2}.Role='vector_y';
125            case 'norm'
126                if exist('XI','var')
127                    if check_interp(ilist)
128                    U2=F.(UName{ilist})(XI,YI).*F.(UName{ilist})(XI,YI);
129                    V2=F.(VName{ilist})(XI,YI).*F.(VName{ilist})(XI,YI);
130                    end
131                else
132                    U2=Data.(UName{ilist}).*Data.(UName{ilist});
133                    V2=Data.(VName{ilist}).*Data.(VName{ilist});
134                end
135                VarVal{nbvar+1}=sqrt(U2+V2);
136                ListVarName{nbvar+1}='norm';
137                VarAttribute{nbvar+1}.Role='scalar';
138            case {'curl','div','strain'}
139                if exist('XI','var')
140                    if check_interp(ilist)
141                    VarVal{nbvar+1}=F.(UName{ilist})(XI,YI);
142                    end
143                else
144                    VarVal{nbvar+1}=Data.(UName{ilist});
145                end
146                ListVarName{nbvar+1}=UName{ilist};
147                VarAttribute{nbvar+1}.Role='scalar';
148            otherwise
149                if ~isempty(FieldName{ilist})
150                    if exist('XI','var')
151                        if check_interp(ilist)
152                        VarVal{nbvar+1}=F.(FieldName{ilist})(XI,YI);
153                        end
154                    else
155                        VarVal{nbvar+1}= Data.(FieldName{ilist});
156                    end
157                    ListVarName{nbvar+1}=FieldName{ilist};
158                    VarAttribute{nbvar+1}.Role='scalar';
159                end
160        end
161    end
162end
163
164%% put an error flag to indicate NaN data
165% if exist('XI','var')&&~isempty(VarVal)
166%     nbvar=numel(VarVal);
167%     ListVarName{nbvar+1}='FF';
168%     VarVal{nbvar+1}=isnan(VarVal{nbvar});
169%     VarAttribute{nbvar+1}.Role='errorflag';
170% end
171
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