Is there an element-by-element multiplication in R, like the .* operator in Matlab?
eg: A (2x3)
B (2x3)
C=A.*B
C (2x3)
C = [[a11*b11 a12*b12 a13*b13]; [a21*b21 a22*b22 a23*b23]]
I can't find one
Thanks
-Mike Gates
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See:

11/9/05, Gates, Michael BGI SF <Michael.Gates (AT) barclaysglobal (DOT) comwrote:
Is there an element-by-element multiplication in R, like the .* operator in Matlab?

eg: A (2x3)
B (2x3)
C=A.*B
C (2x3)
C = [[a11*b11 a12*b12 a13*b13]; [a21*b21 a22*b22 a23*b23]]

I can't find one

Thanks

-Mike Gates

R-help (AT) stat (DOT) math.ethz.ch mailing list

PLEASE do read the posting guide!

R-help (AT) stat (DOT) math.ethz.ch mailing list

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11/9/2005 2:26 PM, Gates, Michael BGI SF wrote:
Is there an element-by-element multiplication in R, like the .* operator in Matlab?

eg: A (2x3)
B (2x3)
C=A.*B
C (2x3)
C = [[a11*b11 a12*b12 a13*b13]; [a21*b21 a22*b22 a23*b23]]

I can't find one

Just use "*". If you want matrix multiplication, you'd use %*%.

Duncan Murdoch

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Is there an element-by-element multiplication in R, like the .* operator in Matlab?
How about *?
a <- matrix(1:4, 2, 2)
b <- matrix(4:7, 2, 2,)
a * b
Hadley
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Gates, Michael BGI SF wrote:

>Is there an element-by-element multiplication in R, like the .* operator in Matlab?
>
>eg: A (2x3)
B (2x3)
>C=A.*B
>C (2x3)
>C = [[a11*b11 a12*b12 a13*b13]; [a21*b21 a22*b22 a23*b23]]
>
>I can't find one

mym <- matrix(1:4,2)
myt <- matrix(5:8,2)

mym
[,1] [,2]
[1,] 1 3
[2,] 2 4
myt
[,1] [,2]
[1,] 5 7
[2,] 6 8
mym * myt
[,1] [,2]
[1,] 5 21
[2,] 12 32

HTH,
Tobias

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Wed, 9 Nov 2005, Gabor Grothendieck wrote:

See:

That is a really beautiful page. If the author is willing to update it to
include some of the new functionality -- specifically N-dimensional
arrays -- I'm sure I can help out. If there is new R functionality to
include, I probably wouldn't know about it (I'm still learning R) but
maybe someone else on the list would know.

Mike

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