Extract data from struct array (2024)

dt = 1/1000;

T = 5;

t = 0:dt:T;

data = struct([]);

for it = 1:length(t)

data(it).t = t(it);

data(it).sys = genStruct(t(it));

end

function sOut = genStruct(t)

sOut = struct;

sOut.sys1 = struct;

sOut.sys2 = struct;

sOut.sys1.sub1 = genSubsystemStruct(t);

sOut.sys1.sub2 = genSubsystemStruct(t);

sOut.sys2.sub1 = genSubsystemStruct(t);

sOut.sys2.sub2 = genSubsystemStruct(t);

end

function sOut = genSubsystemStruct(t)

sOut = struct;

sOut.t = t;

sOut.dataPoint1 = randn();

sOut.dataPoint2 = randn();

end

sFieldsOfInterest = struct; % Data map

sFieldsOfInterest.data = ["t"]; % Fields listed under data are saved to a row

sFieldsOfInterest.sys = struct;

sFieldsOfInterest.sys.sys1 = struct('sub1', struct('data', ["dataPoint1", "dataPoint2"]), ...

'sub2', struct('data', ["dataPoint1", "dataPoint2"]));

sFieldsOfInterest.sys.sys2 = struct('sub1', struct('data', ["dataPoint1", "dataPoint2"]), ...

'sub2', struct('data', ["dataPoint1", "dataPoint2"]));

dataArray = [];

for ii = 1:length(data)

dataArray(end+1,:) = getDataFromStructArray(data(ii), sFieldsOfInterest);

end

function row = getDataFromStructArray(dataStruct, structure)

row = [];

f = fields(structure);

for ii = 1:length(f)

if f{ii} == "data"

fois = structure.(f{ii}); % Fields of interest

for foi = fois

row = [row dataStruct.(foi)];

end

else

row = [row getDataFromStructArray(dataStruct.(f{ii}), structure.(f{ii}))];

end

end

end

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  https://de.mathworks.com/matlabcentral/answers/1976894-extract-data-from-struct-array#answer_1248524

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