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mat2
2013 May 14
0
Matrix multiplication with scattered NA values
...e(text="
24??????????????? 0.0000000??????? 0.0000000
0.0000000??????? 14??????????????? 0.0000000
0.0000000 0.0000000??????? 10
",sep="",header=FALSE))
?mat1%*%mat2
?# ??? V1? V2? V3
#[1,] 792 630 500
#[2,]? NA? NA? NA
library(Matrix)
mat1m<- as(mat1,"dgCMatrix")
?mat2m<- as(mat2,"dgCMatrix")
tcrossprod(mat1m,mat2m)
#2 x 3 sparse Matrix of class "dgCMatrix"
#???????????????
#[1,] 792 630 500
#[2,]? NA? NA 540
A.K.
>Hi,
>
>I'm looking to multiply two matrices together, one of which may
contain randomly placed NA values (i.e...