On Nov 30, 2009, at 11:10 AM, Will Carr wrote:
Working with an NxMxO sized matrix, currently I can do this in my
code:
What are M, N, and O? All the same magnitude?
if (max(colSums(array)) >= number)
But to get an equivalent result using rowSums, I have to do:
for (i in 1:10)
{
if (max(rowSums(array[,,i])) >= number)
What are you doing based on that if( ) determination?
}
I'm running both in a much larger loop that loops millions of times,
so
speed and such is quite a big factor for me. Currently, the colSums
line
uses about 1/10th as much time as the rowSums' for loop, and the for
loop
actually took as much time as the rest of my code combined took to
execute.
Are you sure you are interpreting your profile results correctly?
Is there a faster way than using a for loop and rowSums?
It may depend on what you are trying to do, which at the moment is
most unclear.
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