Re: Problem with large array

[ahowe42]

If at anyway possible, I ALWAYS preinitialize arrays.  Doing so should make
your code faster and more efficient 90% of the time (imho).  Here's what I
would do, keeping the loop:

1) preinitialize X_big & Y_big using /zeros(nm,np)/ and a counter /copcnt =
0;/
2) inside the innermost if branch do this:

/this_row = [features(m_counter, :), Y'(p_counter,:) ];
X_big(copcnt+=1,:) = thisrow
Y_big(copcnt) = Y(m_counter, p_counter);/

3) after the loop

/X_big = X_big([1:copcnt],:); Y_big = Y_big([1:copcnt],:);/

All that said, there should be a way to do this without looping, or at the
very least with a single loop.  Vectorization of operations is another thing
that almost always improves code; except where functionality depends on
*successive* operations, vectorization is usually possible.

Andrew

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