Accessing multiple fields in nested structures for string comparison

Question

Bob photonics 2018-5-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/398462-accessing-multiple-fields-in-nested-structures-for-string-comparison

评论： Bob photonics 2018-5-2

采纳的回答： Jos (10584)

在 MATLAB Online 中打开

I want to be able to access a specific field within my structure across multiple nested structures.

Let me explain what I want by an example:

I have a structure called

libinfo

This structure is a library where I'm going to save information and standard conventions for a specific toolbox. this structure has a substructure called:

raithinfo

raithinfo will contain multiple structure and be the general container for all the elements that my toolbox needs to draw/plot. (csf output file type)

Now what I want is to access a specific field in each of the sub-structures under raithinfo, I want to compare the string belonging to the field "Raithstrucname" to a specific string, so that I can find out what the index of the structure is within the raithinfo (so that I can extract specific information). My libinfo.raithinfo looks somhting like below if I type this into matlab

libinfo.raithinfo

ans =

[1x1 struct] [1x1 struct] [1x1 struct]

libinfo.raithinfo{:}

ans =

    Raithstrucname: 'YsplitRef_ID_0003_L'
        Raithstruc: [1x1 Raith_structure]
    centerposition: {[0]  [0]}
       workingarea: {[-50]  [-50]  [50]  [50]}
       boundingbox: {2x4 cell}
      positionlist: 0
             ports: [1x1 struct]

ans =

    Raithstrucname: 'CouplerRef_ID_WG0.5_P0.46_DC0.59_padw8_f10_g10_T250_DF1_L'
        Raithstruc: [1x1 Raith_structure]
    centerposition: {[0]  [0]}
       workingarea: {[-140]  [-9]  [140]  [9]}
       boundingbox: {2x1 cell}
      positionlist: 0
             ports: [1x1 struct]

ans =

    Raithstrucname: 'CouplerRef_ID_0002_L'
        Raithstruc: [1x1 Raith_structure]
    centerposition: {[0]  [0]}
       workingarea: {[-140]  [-9]  [140]  [9]}
       boundingbox: {2x1 cell}
      positionlist: 0
             ports: [1x1 struct]

Now later on I will have to do the same for the positionlist, I will also need to check those values (check wether 0 or 1). Keep in mind that raithinfo might be quite a big list, a 1000 sub-structures wouldn't be weird, so I would like to use a method that's not really slow and if possible only 1 or 2 lines of code and not a for-loop, IF POSSIBLE.

I tried this

IndexC=find(ismember(libinfo.raithinfo{:}.Raithstrucname(:),couplername));

But that of course didn't work as it won't let me access them all at once

Currently I initialize my libinfo (library information) like this:

if isempty(libinfo)
  libinfo(1).raithinfo{1}=struct('Raithstrucname',{nameL},'Raithstruc',{coupler_structL},...
  'centerposition',{{0,0}},'workingarea',{WA},'boundingbox',{BD},'positionlist',{0},...
  'ports',struct('in', struct('amount',{0},'positions',{},'angles',{}),...
  'out',struct('amount',{1},'positions',{{cpl_length/2,0}},'angles',{{0}})));
elseif isempty(isempty(libinfo(1).raithinfo{1}))
  libinfo(1).raithinfo{1}=struct('Raithstrucname',{nameL},'Raithstruc',{coupler_structL},...
  'centerposition',{{0,0}},'workingarea',{WA},'boundingbox',{BD},'positionlist',{0},...
  'ports',struct('in', struct('amount',{0},'positions',{},'angles',{}),...
  'out',struct('amount',{1},'positions',{{cpl_length/2,0}},'angles',{{0}})));
else
  libinfo(1).raithinfo{end+1}=struct('Raithstrucname',{nameL},'Raithstruc',{coupler_structL},...
  'centerposition',{{0,0}},'workingarea',{WA},'boundingbox',{BD},'positionlist',{0},...
  'ports',struct('in', struct('amount',{0},'positions',{},'angles',{0}),...
  'out',struct('amount',{1},'positions',{{cpl_length/2,0}},'angles',{{0}})));
end

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Answer 1

Jos (10584) 2018-5-1

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/398462-accessing-multiple-fields-in-nested-structures-for-string-comparison#answer_318142

在 MATLAB Online 中打开

Assuming libinfo is a scalar structure, and hence libinfo.Raithinfo is a cell array, you may benefit from using cellfun (or arrayfun)

tf1 = cellfun(@(C) ismember(C.Raithstrucname, couplername), libinfo.Raithinfo)
tf2 = arrayfun @(k) ismember(libinfo.Raithinfo{k}.Raithstrucname, couplername), 1:numel(libinfo.Raithinfo))