acess struct data without typing file name

in

http://www.mathworks.com/matlabcentral/answers/33824-access-struct-data-using-filename-given-by-u-load-filepath-filename

you answered my question offering as option U=load(); but unfortunately this doesn't solve my problem.

by using uigetfile I can select the .mat file that contains my structured data. this is good. I have multiple files named, i.e. bending0001, bending0002, bending0003 and so on

to access the data, I'm doing this, for example:

Analog_SG_full = bending0001.Analog.Data(1,:);

as I have multiple files and multiple fields from which I want to extract data, I don't want to type the name bending000X for each access.

Thanks,

Carolina

Answer 1

[Walter Roberson]

for K = 1 : 3
  fileName = sprintf('bending%04d.mat', K);
  U = load(fileName);
  fprintf('\nData for file %d\n', K);
  U.Analog.Data(1,:)
end

[Carolina Brum Medeiros]

Thanks Walter,

it's a good approach for loading multiple files. However, by doing U = load(fileName), a struct 1x1 is attributed to U.

Then, when I try to use U.Analog.Data(1,:), is points that U has no field Analog.

wow, this was supposed to be single, no?

thanks for your contribution

[Image Analyst]

Tell us all the fields that it does have.

[Carolina Brum Medeiros]

BENDING0001.File,

BENDING0001.Frames,

BENDING0001.FrameRate,

BENDING0001.Trajectories,

BENDING0001.Analog

and other fields inside them

[Walter Roberson]

That shouldn't be the case for load() of .mat files unless the "BENDING0001" is part of what is stored in the file. You can use whos() to see the names of the variables in the file. If the BENDING001 is part of what is stored in the file, then when you create those files you might want to consider using save() with the -struct flag instead of plain save()

Anyhow, the work around is like this:

for K = 1 : 3

rootname = sprintf('bending%04d', K);

fileName = [rootname '.mat'];

U = load(filename);

fields = fieldnames(U);

if length(fields) > 1

clear T

T.(rootname) = U;

U = T;

else

rootname = fields{1};

end

fprintf('\nData for file %d\n', K);

U.(rootname).Analog.Data(1,:)

end

[Carolina Brum Medeiros]

Dear Walter, this really works good!!!

thank you so much!