Save Struct as .mat file!!!

Hello all,

I have a problem in saving Struct format in .mat file.

If I have "a" as 1x5 struct

So, in command window it looks like this:

a = 

ans =

     246

ans =

     444

ans =

     630

ans =

     810

ans =

     984
Any way that I can save it as a .mat file of 1x5?
Thanks so much for your help :)

[M G]

Here is the file:

https://dl.dropboxusercontent.com/u/19202474/matFile.zip

I want to save

 a.latency

which consists of 947 value in one mat file. I do like:

save filename.mat a.latency
... but doesn't work!!!

Answer 1

[Jan]

Of course this does not work, because "a.latency" is not a name of a variable. You need:

save('filename.mat', 'a')

The functional form is less confusing for the save command.

If you want to save the fields "latency" only:

latency = {a.latency};
save('filename.mat', 'latency')

[Carl Witthoft]

This should be reported as a significant bug in MATLAB. It's really sad that the "save" function can't parse a string "name.structelement" to save what we want saved.

[Muhammad Haryanto]

Interesting answer sir. How can I use that to save looping struck? And how can I use it for load? I want Thanks a lot sir.

[Jan]

@Muhammad Haryanto: See:

S.a = 1;
S.b = 2;
save(FileName, '-struct', 'S');
Data = load(FileName)

Now Data contains the fields 'a' and 'b'.

[Muhammad Haryanto]

I'm sorry to brother you again. I mean.

 S.a=1;
 While S.a<=5
 S.a=S.a+1;
 End

How can I save S.a? When I put

 Save('filename.mat',-struck', 'S');

Before end, at filename just a. When I load, output is

 a:[1x1 struck].

Please...

[Jan]

@Muhammad: I do not understand the question. What do you want to save? Try:

save('filename1.mat', '-struct', 'S');  % Not "struck"
save('filename2.mat', 'S');
a = S.a;
save('filename3.mat', 'a');

[Sara Fawal]

Hi Jan,

My situation is a little different. I have several .mat structures and I just want to combine all of them into one GINOURMOUS .mat structure.

The mat structures caontain similar names and different types of arrays (numbers, names, date&time stamp, etc.)

How can I combine all the .mat structures irrelevant of how long the vectors are and their type.

Thank you very much for your help.

Sara Fawal

[Walter Roberson]

If there are two .mat files that have exactly the same variable name, how do you want that to appear on output? Do you want the contents merged together into a single variable? Do you want new unique variable names generated?

[Sara Fawal]

Hello Walter,

The .mat embeded structures are all unique and do not have the same names nor the same variables.

I just want to combine them all. I have many .mat embeded structures and I want them all in one GINOURMOUS .mat embeded structure.

Thank you again for your help.

Sara Fawal

[Walter Roberson]

inputdir = 'appropriate directory path';
outputfile = 'appropriate file name';   %do not put it into inputdir !
dinfo = dir( fullfile(inputdir, '*.mat') );
filenames = fullfile( inputdir, {dinfo.name} );
for K = 1 : length(filenames)
    thisfile = load(filenames{K});
    save(outfile, '-struct', 'thisfile', '-append');
end

[Gustavo Araujo]

Is there a way to save those mat files sequentially? I mean: create a loop saving File1.mat, File2.mat and so on. I'm trying:

for i=1:3
  Ir(i) = [Ir];
end
save('Irn.mat', 'Ir');

but the Irn saves in another column the second and third variable. How to proceed correctly?

Thank you in advance.

[Walter Roberson]

for K = 1 : number_of_files
    filename = sprintf('File%d.mat', K);
    save(filename, 'Ir')
end

Answer 2

[the cyclist]

What do you mean by "a .mat file of 1x5"?

>> save filename.mat a

will save the structure, exactly as it is in the workspace.

>> load filename.mat a

will load it back into the workspace.

[M G]

https://dl.dropboxusercontent.com/u/19202474/matFile.zip

I uploaded the .mat file in here. I want to save a.latency which consists of 947 value in one mat file. I do like:

save filename.mat a.latency
   but doesn't work!!