image processing - how to place functions in main file in matlab? -

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i have small question, have created functions zoom, nni, bilenear displaying picture is:

zoom.m 

function [out]= zoom(n,factor) ----- --- ---- end

nni.m

function [out]= nni(n,factor) ----- --- ---- end

bilenear.m

function [out]= bilenear(n,factor) ----- --- ---- end

what trying: main.m

function [out]= answer(n, factor) clc function [out]= zoom(n,factor) function [out]= nni(n,factor) function [out]= bilenear(n,factor) end

i want main function display zoomed picture, nni pic , bilenear separately

to build on schorsch's answer since mention want main function display these images try following: 

function [out] = compare_interpolations(n,factor) clc zoomed = zoom(n,factor); nearest= nni(n,factor); bilinterp=bilinear(n,factor);  figure; subplot(1,3,1);imshow(zoomed);title('zoomed'); subplot(1,3,2);imshow(nearest);title('nearest neighbor'); subplot(1,3,3);imshow(bilinterp);title('bilinear');   end

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