Scaling a Single Column Vector of a Matrix in R

Question

I'm interested in scaling one column of a matrix and then returning the whole matrix.

Suppose I have the matrix:

If I do something like:

> A[,1] * 10

I'll end up with:

However, I'd like to end up with something like:

Here's the solution I've come up with so far:

> A <- cbind(A[,1]*10, A[,2])
> A

Is this the best way to accomplish what I'd like to do?

Answer 1

You can assign it to the columns that is being changed

A[,1] <- A[,1]*10
A
#     [,1] [,2]
#[1,]   10    2
#[2,]   30    4

data

A <- matrix(c(1,3,2,4), ncol=2)