Is it possible to extract all fields from a structure automatically?

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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!)
  7 comentarios
Mr M.
Mr M. el 10 de Ag. de 2016
Why anybody think that this is a dynamic variable in my example? I think this is simple loading problem and not dynamic variable.
Stephen23
Stephen23 el 14 de Nov. de 2019
Editada: Stephen23 el 14 de Nov. de 2019

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Stephen23
Stephen23 el 11 de Ag. de 2016
Editada: Stephen23 el 11 de Ag. de 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')
and then load it like this:
>> clear
>> load('temp.mat')
>> name
name = anna
>> data
data =
1 2 3
and you will find all of those variables in your workspace.

Más respuestas (2)

Baium
Baium el 14 de Nov. de 2019
Editada: Baium el 14 de Nov. de 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 comentarios
Alec Jacobson
Alec Jacobson el 9 de Mayo de 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));

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Azzi Abdelmalek
Azzi Abdelmalek el 10 de Ag. de 2016
Editada: Azzi Abdelmalek el 10 de Ag. de 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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