num2str in for loop assignment

I have a matrix output(100,100) imported in matlab. I would like to creat a vector that saves every 10 col. forexample

Output_1=output(:,1);
save output_1.mat x  y

Output_2=output(:,10);
save output_2.mat x  y

Output_3=output(:,30);
save output_3.mat x  y

However, instead of doing so, I would like to create a for loop and this is how I try;

    for i= 1:10:100;
      Output_num2str(i)=output(:,i);
      save output_num2str(i).mat x  o
      end

and matlab says In an assignment A(:) = B, the number of elements in A and B must be the same.

how can I fix this. Thanks

Answer 1

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

In your case:

basename = sprintf('output_%d', i);
clear out_struct
out_struct.(basename) = output(:,i);
out_struct.x = x;
out_struct.y = y;
filename = [basename '.mat']
save(filename, 'out_struct', '-structure');

... but it would be better to use the same variable name in each file instead of using dynamic variable names.

Answer 2

[Image Analyst]

You can't do

save output_num2str(i).mat x  o

Try this:

thisColumn = output(:,i);
filename = sprintf('output_%d.mat', i);
filename = fullfile(pwd, filename);
save(filename, 'thisColumn', 'x', 'y');