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annotate m-toolbox/classes/+utils/@prog/rnfield.m @ 0:f0afece42f48

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Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 function ss=rnfield(s,oldname,newname)
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2 %RNFIELD Rename Structure Fields.
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3 % RNFIELD(S,OldName,NewName) returns the structure S with the field name
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4 % denoted by the string OldName changed to NewName. Oldname must exist in S.
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5 %
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6 % If OldName and NewName are cell arrays of strings of equal length, each
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7 % field name in OldName is changed to the corresponding element in NewName.
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8 %
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9 % Examples:
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10 %
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11 % RNFIELD(S,fieldnames(S),lower(fieldnames(S))) makes all field names lower
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12 % case as long as they are unique when lowercase
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13 %
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14 % If S.a=pi; S.b=inf; then
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15 % RNFIELD(S,{'a' 'c'},{'c' 'd'}) produces S.d=pi; S.b=inf;
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16 %
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17 % See also ORDERFIELDS, RMFIELD, ISFIELD, FIELDNAMES.
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18
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19 % D.C. Hanselman, University of Maine, Orono, ME 04469
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20 % MasteringMatlab@yahoo.com
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21 % Mastering MATLAB 7
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22 % 2006-02-08, 2006-02-09
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23
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24 if nargin~=3
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25 error('rnfield:IncorrectNumberofInputArguments',...
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26 'Three Input Arguments Required.')
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27 end
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28 if ~isstruct(s)
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29 error('rnfield:IncorrectInputArgument',...
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30 'First Argument Must be a Structure.')
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31 end
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32 if ~(ischar(oldname)||iscellstr(oldname)) &&...
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33 ~(ischar(newname)||iscellstr(newname))
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34 error('rnfield:IncorrectInputArgument',...
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35 'Last Two Arguments Must be Strings or Cell Strings.')
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36 end
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37 if ischar(oldname) % convert to cell
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38 oldname=cellstr(oldname);
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39 end
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40 if ischar(newname) % convert to cell
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41 newname=cellstr(newname);
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42 end
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43 nold=length(oldname);
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44 if nold~=length(newname)
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45 error('rnfield:IncorrectInputArgument',...
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46 'OldName and NewName Must Have the Same Number of Elements.')
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47 end
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48
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49 fnames=fieldnames(s); % get field names of input structure
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50
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51 for k=1:nold % do the work and perform error checking
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52 if ~isequal(oldname{k},newname{k}) % no work if oldname==newname
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53 if ~isvarname(newname{k})
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54 error('rnfield:NewFieldNameNotValid',...
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55 'Invalid New Field Variable Name: %s',newname{k})
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56 end
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57 old=strcmp(fnames,oldname{k});
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58 if ~any(old)
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59 error('rnfield:OldFieldNameDoesNotExist',...
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60 'Structure Does Not Contain the Field: %s',oldname{k})
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61 end
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62 if any(strcmp(fnames,newname{k}))
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63 error('rnfield:NewFieldNameAlreadyExists',...
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64 'Structure Already Contains the Field: %s',newname{k})
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65 end
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66 fnames(old)=newname(k); % replace old field name with new one
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67 end
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68 end
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69 ssize=size(s);
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70 c=struct2cell(s); % convert structure to cell
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71 ss=reshape(cell2struct(c,fnames,1),ssize); % rebuild with revised fields