is there any way to replace this code part with an equivalent part that runs faster?
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Walter Roberson on 21 May 2019
As you appear to be running those in a loop, move the
to outside the loop.
You do not appear to be doing implicit expansion, so size(yy_abs)appears to be the same as that 300, 500, so you can probably move the zeros(size(yy_abs)) to outside the loop too.
You can probably replace the loop with a cumsum() followed by zeroing the first row of the result.
I have to say that it looks odd that you would want row 2 to be the sum of row 1 and 2 of yy_abs, and row 3 to be the sum of rows 1, 2, 3 of yy_abs, and so on, but that you want row 1 of the output to be left at zero from the initialization to 0, instead of being the same as the first row of yy_abs.