Matlab subplot in a double loop

Question

I have a double loop where I wish to also return a subplot:

for j = 1:tileno 
    for k = 1:tileno 

    imsub{j,k} = imgquant(rowdiv*(j-1)+1:rowdiv*j, coldiv*(k-1)+1:coldiv*k);
    subplot(tileno, tileno, ???); hist(imsub{j,k}(:), n_bins);

    end 
end

So the code stores some rowdiv*coldiv images in imsub{j,k} and during that loop I wish to plot a histogram of each of these stored images. I tried running a loop over that double loop:

for j = 1:tileno 
    for k = 1:tileno 
        for p = 1:tileno^2

    imsub{j,k} = imgquant(rowdiv*(j-1)+1:rowdiv*j, coldiv*(k-1)+1:coldiv*k);
    subplot(tileno, tileno, p); hist(imsub{j,k}(:), n_bins);

        end 
    end
end

but this returned the same histogram tileno^2 times, so I think it does a histogram of imsub{1,1} for instance and then subplots this for each p, rather than for each p returning a distinct hist(imsub{j,k}). Many thanks for any help.

Actually I just noticed I can do subplot(tileno, tileno, tileno*(j-1)+k) and that gives a unique index for each subplot. — Mike Miller
– Mike Miller, Commented Jun 8, 2015 at 16:11

Potaito · Accepted Answer · 2015-06-08 16:12:09Z

1

You need to compute the index manually:

for j = 1:tileno 
    for k = 1:tileno 
    plot_index = (j-1)*tileno+k;
    imsub{j,k} = imgquant(rowdiv*(j-1)+1:rowdiv*j, coldiv*(k-1)+1:coldiv*k);
    subplot(tileno, tileno, plot_index hist(imsub{j,k}(:), n_bins);

    end 
end

answered Jun 8, 2015 at 16:12

Potaito

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1 Comment

Mike Miller Over a year ago

Spotted that just before your answer! Thanks :)

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