MATLAB: I want to store all iteration value in the variable.

MATLAB

every time the loop are executing then the previous value are overwritten. so please give valuable solution.

Best Answer

Here is an example to avoid overwriting in a loop:

c=zeros(1,10); % preallocate for speed and efficiency
for i = 1:numel(c)
    c(i)= 2^(i);
end
c

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MATLAB: Store all iterations in nested for loop

A={[30;31],[],[];[18;20;24],[27;24;26],[];[13;16;18],[14;16;17],[15;16;16];5,9,8};
NewMatrix=flipud(A).';
NewMatrix=NewMatrix(:);
NewMatrix(cellfun('isempty',NewMatrix))=[];
celldisp(NewMatrix)
 
NewMatrix{1} =
 
     5

 
 
NewMatrix{2} =
 
     9

 
 
NewMatrix{3} =
 
     8

 
 
NewMatrix{4} =
 
    13
    16
    18

 
 
NewMatrix{5} =
 
    14
    16
    17

 
 
NewMatrix{6} =
 
    15
    16
    16

 
 
NewMatrix{7} =
 
    18
    20
    24

 
 
NewMatrix{8} =
 
    27
    24
    26

 
 
NewMatrix{9} =
 
    30
    31

MATLAB: Store all iteration loop outputs in a file

If the file is very large then you could use memmapfile:

https://www.mathworks.com/help/matlab/import_export/overview-of-memory-mapping.html

Or one of the other large file accessing tools:

https://www.mathworks.com/help/matlab/large-files-and-big-data.html

Or you can simply create a new file on each iteration:

 save(sprintf('name%04d.mat',k),'X')

Note: the -append option should really be named the -replace option, as the save documentation makes clear: " save(filename,variables,'-append') adds new variables to an existing file. If a variable already exists in a MAT-file, then save overwrites it. The variables argument is optional."

Best Answer

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MATLAB: Store all iterations in nested for loop

MATLAB: Store all iteration loop outputs in a file

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