Re: [R] interpolation function

From: tom wright <tom_at_maladmin.com>
Date: Fri 05 Aug 2005 - 21:10:59 EST

On Fri, 2005-05-08 at 12:12 +0000, 吴 昊 wrote:
> Hi,
> I have a sparse matrix.I want to fill values into the entries whose value
> is 0.The new generated values should come from the interpolation of the
> values have existed.Does R provide such interpolation functions which
> operate on Matrix, for example ,such a matrix below
> 0 0 0 0 2.3 0 0 0 0
> 0 0 3.1 0 0 0 0 1.4 0
> 0 0 0 0 0 0 0 0 0
> 1.1 0 0 0 0 0 0 0 0
> 0 0 0 4 0 0 0 0 6
> 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 7 0 0 0
> 0 3 0 0 0 0 6 0 0
> 0 0 0 0 9 0 0 0 0
> thanks a lot
> hao wu

Does this look like an answer? If anyone knows a better way please tell me.

> d<-c(0,2,3,2,0,3,4,0,0,0,0,0)
> d.mat<-matrix(data=d,nrow=4,ncol=3,byrow=TRUE)
> for(i in 1:length(d.mat[1,])){


+ d.mat[,i][d.mat[,i]==0]<-mean(d.mat[,i][d.mat[,i]>0]) + }

Thanks
Tom



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