[R] command similar to colSums for rowSums?

[Peter Ehlers]

Or maybe aperm() is faster:

  max(colSums(aperm(yourArray, c(2,1,3))))

  -Peter Ehlers

Peter Ehlers wrote:
> Does this
> 
>  max(apply(yourArray, 3, rowSums))
> 
> give you what you want?
> 
>  -Peter Ehlers
> 
> Will Carr wrote:
>> Working with an NxMxO sized matrix, currently I can do this in my code:
>>
>> 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) }
>>
>> 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.
>> Is there a faster way than using a for loop and rowSums?
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
>