Is it possible to extract all fields from a structure automatically?
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Mr M.
am 10 Aug. 2016
Kommentiert: Ludmila Kuncheva
am 24 Aug. 2021
I have data in the form: mydata.x = 100; mydata.s = 'abc'; mydata.Y = [1 2 3]; And I want variables x = 100; s = 'abc'; Y = [1 2 3]; How to extract variables automatically? (suppose that I don't know the names of the variables!)
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Stephen23
am 14 Nov. 2019
Bearbeitet: Stephen23
am 14 Nov. 2019
"Why anybody think that this is a dynamic variable in my example?"
Because that is exactly what load does, when called without an output argument: it dynamically creates all of the loaded variables in the caller workspace:
https://www.mathworks.com/matlabcentral/answers/335253-mat-files-not-loading-correctly#answer_262994
And of course:
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Stephen23
am 11 Aug. 2016
Bearbeitet: Stephen23
am 11 Aug. 2016
You seem intent on magically making variables pop into existence in the workspace, so here is probably the least-worst way of doing that. The trick is to change the save command by adding the '-struct' option:
>> S.name = 'anna';
>> S.data = 1:3;
>> save('temp.mat','-struct','S')
>> clear
>> load('temp.mat')
>> name
name = anna
>> data
data =
1 2 3
and you will find all of those variables in your workspace.
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Baium
am 14 Nov. 2019
Bearbeitet: Baium
am 14 Nov. 2019
Alternative, maybe this is more desired than dictating how the struct will be saved in the workspace (this will recursively unpack any struct within the struct):
function unpackStruct (structure)
fn = fieldnames(structure);
for i = 1:numel(fn)
fni = string(fn(i));
field = structure.(fni);
if (isstruct(field))
unpackStruct(field);
continue;
end
assignin('base', fni, field);
end
end
6 Kommentare
Alec Jacobson
am 9 Mai 2021
Or as a single anonymous function (which you can drop into your ide)
unpackStruct = @(s) cellfun(@(name) assignin('base',name,getfield(s,name)),fieldnames(s));
Azzi Abdelmalek
am 10 Aug. 2016
Bearbeitet: Azzi Abdelmalek
am 10 Aug. 2016
Use fieldnames function
mydata.x = 100;
mydata.s = 'abc';
mydata.Y = [1 2 3];
field=fieldnames(mydata)
Then you want to assign to each variable individually a corresponding value, which is not recommended. Read this http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F
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