A matrix is already a vector, you don't need to do the transformations,
just do the same thing directly:
> tmp <- matrix( sample(1:12), ncol=3 )
> tmp
[,1] [,2] [,3]
[1,] 11 1 6
[2,] 3 7 9
[3,] 4 12 8
[4,] 2 5 10
> tmp[tmp > 5] <- 0
> tmp
[,1] [,2] [,3]
[1,] 0 1 0
[2,] 3 0 0
[3,] 4 0 0
[4,] 2 5 0
If on the other hand, your matrix is really a data frame then functions
like lapply, sapply, transform may help.
Hope this helps,
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
[EMAIL PROTECTED]
(801) 408-8111
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Thursday, December 14, 2006 7:01 AM
To: r-help@stat.math.ethz.ch
Subject: [R] matrix - change values
Dear R Users,
I have a matrix A, and I want to change every value of this matrix if
these values are greater than an assuming value. For a vector it is
simple, e.g. a<-c(1:10); a[a>5]<-0.
Of course, I can change matrix to vector, assign a value then change
vector to matrix. But does there exist simpler way?
Any suggestion are appreciate.
Rob
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______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
