Calculating exp() of each element in matrix using R

Question

how can I take exp() of each element in a matrix? I have mymatrix = matrix(c(2, 4, 3, 1, 5, 7), 3,2) and tried using res<-expm(mymatrix) but it requires mymatrix to be square. Is there another way to calculate each element so res is matrix(c(exp(2), exp(4), exp(3), exp(1), exp(5), exp(7), 3,2) ?

Btw, there is no expm in R. You should be clear about what packages you're using. — Frank
– Frank, Commented Apr 3, 2017 at 18:44
I tried the command on the dummie matrix in this example and it works perfect! However when I try it on my bigger matrix I get following error message Error in expm(Matrix(x)) : Matrix exponential requires square, non-null matrix Yes my matrix is not square, but neither is my dummie matrix. I have looked at each cell of the matrix and there are no cells=0. I'm confused — Orongo
– Orongo, Commented Apr 3, 2017 at 19:00
You're confusing a matrix exponential with taking the exp() of each element. These are different operations. A matrix exponential is defined by a power series, and powers are only defined for square matrices. — Matthew Lundberg
– Matthew Lundberg, Commented Apr 3, 2017 at 19:57

thc · Accepted Answer · 2017-04-03 19:53:38Z

res <- mymatrix res [] <- exp(res) > res [,1] [,2] [1,] 7.389056 2.718282 [2,] 54.598150 148.413159 [3,] 20.085537 1096.633158

Here you go.

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