MATLAB: Printing original matrix after loop

displayfor loopmatrixprint

I made a uniformly distributed random matrix, then ran it through a loop to replace all numbers less than 0.34 with -1. After the loop is complete, I want to print both the original matrix, and the modified matrix after the loop with a disp command. I can print the modified matrix but how do I print the original from before the loop?

Best Answer

You need to save a copy of the original in order to print it afterwards.

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MATLAB: Does MATLAB copy large input parameters or does it operate on pointers

Matlab takes a copy of a matrix only when you make a change to that matrix, so even though it does not use pass by reference (except for handle-derived classes) it will not take a copy of an array if you pass it to another function and use it for read-only purposes. The copy will happen when you make a change to the array in your function. i.e. essentially it uses copy-on-write semantics.

MATLAB: Printing Axes

With export_fig you can specify a list of handles of the axes to print, and only these axes will be printed. E.g.:

figure;
for a = 1:4
   hax(a) = subplot(2,2,a);
   plot(rand(3));
end
export_fig(hax([1 3]), 'test.png');

It essentially implements Daniel's suggestion, so you don't have to. However, it may not work perfectly with GUIs as they tend to behave differently. Try it, though.

Best Answer

Related Solutions

MATLAB: Does MATLAB copy large input parameters or does it operate on pointers

MATLAB: Printing Axes

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