element wise multiplication in r
23,916
Yes, normal multiplication with b_
as a vector:
a_*as.vector(b_)
[,1] [,2]
[1,] 2 8
[2,] -2 -3
[3,] 3 2
Comments
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Humble Debugger almost 2 years
Is there an inbuilt function or operator to do the following in R :
ElementwiseMultiply <- function ( a_, b_ ) { c_ = a_ ; for ( i in 1:ncol(a_) ) { c_[,i] = ( a_[,i] * b_ ) ; } return ( c_ ); }
For instance
> a_ [,1] [,2] [1,] 1 4 [2,] 2 3 [3,] 3 2 > b_ [,1] [1,] 2 [2,] -1 [3,] 1 > ElementwiseMultiply ( a_, b_ ) [,1] [,2] [1,] 2 8 [2,] -2 -3 [3,] 3 2