How to doulbe all the value on a matrix

Is there an expression to double the values of a matrix - without using a
loop?
 

Why so complicated?
Dieter

m = matrix(rep(1,20),nrow=4)
m

[,1] [,2] [,3] [,4] [,5]
[1,]    1    1    1    1    1
[2,]    1    1    1    1    1
[3,]    1    1    1    1    1
[4,]    1    1    1    1    1

m*3

[,1] [,2] [,3] [,4] [,5]
[1,]    3    3    3    3    3
[2,]    3    3    3    3    3
[3,]    3    3    3    3    3
[4,]    3    3    3    3    3

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