Thanks a lot for your help
marco
2011/5/27 Thomas Lumley
> On Fri, May 27, 2011 at 10:06 AM, marco milella wrote:
> > Hi to everybody
> > I have an array with dimensions 2,4,3,3.
> > Wanting to sum the matrices in the first two dimensions, I'm trying to
> use
> > the "apply" function, but with
Thanks a lot for your hint
marco
2011/5/27 Erich Neuwirth
> > arr<-1:72
> > dim(arr)<-c(2,4,3,3)
> > apply(arr,1:2,sum)
> [,1] [,2] [,3] [,4]
> [1,] 297 315 333 351
> [2,] 306 324 342 360
> > apply(arr,3:4,sum)
> [,1] [,2] [,3]
> [1,] 36 228 420
> [2,] 100 292 484
> [3,]
> arr<-1:72
> dim(arr)<-c(2,4,3,3)
> apply(arr,1:2,sum)
[,1] [,2] [,3] [,4]
[1,] 297 315 333 351
[2,] 306 324 342 360
> apply(arr,3:4,sum)
[,1] [,2] [,3]
[1,] 36 228 420
[2,] 100 292 484
[3,] 164 356 548
>
apply(arr,1:2,sum)
will sum all elements arr(i1,i2,..)
for each
On Fri, May 27, 2011 at 10:06 AM, marco milella wrote:
> Hi to everybody
> I have an array with dimensions 2,4,3,3.
> Wanting to sum the matrices in the first two dimensions, I'm trying to use
> the "apply" function, but with no results. Have to say I'm quite new with R
> syntax.
Tell apply() whi
Hi to everybody
I have an array with dimensions 2,4,3,3.
Wanting to sum the matrices in the first two dimensions, I'm trying to use
the "apply" function, but with no results. Have to say I'm quite new with R
syntax.
tx in advance
marco
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