[R] to print system.time always

[jim holtman]

Here is a faster solution to your 'apply'; use 'sapply' instead:

> str(x)
 num [1:1000000, 1:30] 0.0346 0.4551 0.66 0.8528 0.5494 ...

> system.time(y <- apply(x, 1, cumsum))
   user  system elapsed
  13.24    0.61   14.02
> system.time(ys <- sapply(1:col, function(a) cumsum(x[,a])))
   user  system elapsed
   1.40    0.14    1.59


On Sat, Nov 3, 2012 at 11:52 AM, mrzung <mrzung46 at gmail.com> wrote:
> Hi all;
>
> I want to print system.time whenever I execute any command.
>
> It takes too much time to type "system.time()" function to all command.
>
> is there any solution on it?
>
> And,
>
> apply(matrix,1,cumsum) command is too slow to some large matrix.
>
> is there any function like rowCumSums ?
>
> thank u!
>
>
>
> --
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-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.