save the loop data in a if else statement

I have an if statement

 for ind = 1:MAX_ITER
  if(mod(ind, 1500) == 0)
     h = findobj(gca,'Type','line');                    
     x=get(h,'Xdata');                                     
     y=get(h,'Ydata');                                      
     z=[x,y];                                              
     H_XX = z{2,1};
     H_YY = z{2,2};
     filename=['test',num2str(ind),'.mat'];                     
   save(filename)
 end
end

How can i save the 'H_XX' and 'H_YY' of the entire loop in a single file ?

Answer 1

[KSSV]

count = 0 ;
iwant = cell([],1) ;
for ind = 1:MAX_ITER
  if(mod(ind, 1500) == 0)
     h = findobj(gca,'Type','line');                    
     x=get(h,'Xdata');                                     
     y=get(h,'Ydata');                                      
     z=[x,y];                                              
     H_XX = z{2,1};
     H_YY = z{2,2};
     count = count+1 ;
     iwant{count,1} = [H_XX H_YY] ;
 end
end
iwant = cell2mat(iwant) ;

iwant gives you data when the loop goes inside if. You can save it into a file you want.

[SUSHMA MB]

thanks for the code...but i am not able to view the file 'iwant'

[KSSV]

iwant is a variable...not a file. YOu can save it using save.

[SUSHMA MB]

Thank you for the answer....

Answer 2

[Stephen23]

It is simpler to avoid generating too many values (and then using mod to select which values you want to use) because then you can trivially preallocate an output array of the correct size:

vec = 1500:1500:MAX_ITER;
out = cell(numel(vec),2);
for k = 1:numel(vec)
    ...
    out(k,:) = [x,y];
end
save('test.mat','out')

This trivially avoids expanding the output array on each iteration:

https://www.mathworks.com/help/matlab/matlab_prog/preallocate-memory-for-a-cell-array.html

[SUSHMA MB]

Thank you. But its a part of an entire code....i just want to save the 'H_XX' 'H_YY' in a single file.

[Stephen23]

@SUSHMA MB: sure, that is what my code shows you.

[SUSHMA MB]

Thank you for the answer....