Reducing array size, discarding data

Question

Ben Twill 2021-3-23

评论： Ben Twill 2021-3-23

采纳的回答： DGM

I am trying to reduce the size of an array and discard any data that happens to fall out of the new bounds.

I currently have a loop where 'Array' is an array of larger size then 'Array_Temp'

    for w=1:W
        for h=1:H
            Array_Temp(w,h) = Array(w,h);
        end
    end
    newArray(:,:,k) = myArrayPart_temp;

I am wondering if there is a better way to do this as going through each element one by one is very slow!

KSSV 2021-3-23

discard any data that happens to fall out of the new bounds

This may not keep your matrix intact. Are you okay with that? You want to remove the entire row/ column?

Answer 1

DGM 2021-3-23

编辑：DGM 2021-3-23

No need for loops. Assuming these are mxnxk arrays:

childarray=parentarray(1:H, 1:W, :);

Or if you don't want to start in the corner:

childarray=parentarray(startrow:endrow, startcol:endcol, :);

You could also use imcrop(), though that's a bit frustrating to use in my opinion.

Ben Twill 2021-3-23

Thanks, thats works!