By default, R operations on matrices, vectors, etc are elementwise like .* in
Matlab. If you want matrix multiplication use %*%
Hope this helps and good luck with R!
Feel free to write back if I can help further.
Michael Weylandt
On Aug 6, 2011, at 4:35 PM, smajor wrote:
> Hi all, I'm lea
You need to learn that R syntax is not the same as Matlab syntax.
If you want to use R, learn R. Read the basic introductory material,
readily available from the R web site.
In particular R treats multiplication --- i.e. "*" --- as multiplication.
Arrays are multiplied entry by entry when they
Hi,
You are using the regular multiplication operator, when you want the
matrix multiplication operator. Compare:
> M * v2
[,1] [,2] [,3]
[1,]000
[2,]456
[3,]000
> M %*% v2
[,1]
[1,]2
[2,]5
[3,]8
See ?"*" and ?"%*%"
HTH,
Josh
On Sat,
On Aug 6, 2011, at 4:35 PM, smajor wrote:
Hi all, I'm learning R. I'm used to Matlab and am having the
following issue:
I define a column vector and matrix and then multiply them. The
result is
not what I expect:
v2 <- c(0,1,0)
M <- cbind(c(1,4,7),c(2,5,8),c(3,6,9))
M*v2
[,1] [,2] [
Hi all, I'm learning R. I'm used to Matlab and am having the following issue:
I define a column vector and matrix and then multiply them. The result is
not what I expect:
v2 <- c(0,1,0)
M <- cbind(c(1,4,7),c(2,5,8),c(3,6,9))
M*v2
[,1] [,2] [,3]
[1,]000
[2,]456
[3,]
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