How can the output be written in a new column (without overwriting the previous one)

I am processing several images and use loop for the series. I need to write the output of each loop in a new line beside the previous column.

for example: for the first loop I want data in column 2, for the second loop I want data in column 3 beside column 2

would you help me please?

Answer 1

[M]

You can use cell for that. You can try and adapt the following example:

a=cell(3,1);
for i=1:3
    a{i}=ones(i,1);
end

a =

  3×1 cell array

    {[       1]}
    {2×1 double}
    {3×1 double}

[Shel]

thanks for your kind help. but I think I did not explain correctly.

I have 2000 image for each series and the loop is for a command to be done on each of these images that will be written in column 2. for the second loop the output should be written in column 3 but automatically it is written in the same column which mean for 30 loops I have 1 column and I want to have it in 30 loops seperately.

Thanks

[M]

I still don't get what you want. Did you try something? Can you provide a small example?

[Shel]

this is the shape of what I need to do.

for example comand1 is mean value of image

comand 2= maximum value of image

column 1 (number of image) col2(command1) col3(command2) ....

1 mean img 1 maximum img1 ...

... ... ...

2000 mean img 2000 maximum img 2000

[M]

And what is the part thtat is not working ?

You can load each image in a cell. You would have a cell of size 2000 x 1, one for each image.

Then you simply have to loop over the number of images and save the results:

n = 3; % for the 2 commands + the first column
M=zeros(number_of_images,n)
for idx = 1:number_of_images
    M(idx,1) = idx;
    M(idx,2) = mean(Images{idx}); 
    M(idx,3) = max(Images{idx});
end

[Shel]

Thank you very much.

so as I see the output file should be filled out horizontally and it is not possible to do it vertically (first col1, then col2 and ...), right?

[Shel]

here is my code of the loop:

for thresh=240:300
    fprintf(file1, '%10s %2.5f    \r\n', 'Threshold', thresh);
	for i=1:totalfile
		fname=['8--7-',num2str(i), '.dcm'];
		indicom=dicomread(fullfile(source_dir, fname));
		T=thresh;
		indicom(find(indicom<T))=0;
		img_NB=length(indicom(indicom==0));
           fprintf(file1,' %2.0f  %10s %2.5f    \r\n', i,  '   ', img_NB);
        end
   end 
fclose(file1);

[M]

the output file should be filled out horizontally and it is not possible to do it vertically

You can do it both ways, you have to adapt the indexing.