> my apologies to everyone taking the time to answer this question. i
> didn't explain myself very well.
>
> i have the indices of the elements of the matrix and the matrix won't
> necessarily have zeros everywhere else. is there a way to use the
> indices to strip the elements i need?
>
RTFM
again...mj
-Original Message-
From: Dave Roberts [mailto:[EMAIL PROTECTED]
Sent: Wednesday, November 09, 2005 12:28 PM
To: Mike Jones
Cc: r-help@stat.math.ethz.ch
Subject: Re: [R] elements in a matrix to a vector
Mike,
It's not clear whaty way you are doing it now, but t
Mike,
It's not clear whaty way you are doing it now, but this works
> x <- matrix(c(0,2,0,0,0,4,3,0,0),nrow=3)
> x
[,1] [,2] [,3]
[1,]003
[2,]200
[3,]040
> y <- as.vector(t(x))
> z <- y[y!=0]
> z
[1] 3 2 4
Dave
Mike Jones wrote:
> hi all,
>
ginal Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Mike Jones
> Sent: Wednesday, November 09, 2005 8:14 AM
> To: r-help@stat.math.ethz.ch
> Subject: [R] elements in a matrix to a vector
>
> hi all,
>
> i'm trying to get elements in a m
If you are really looking for a way to extract the non-zero elements you
can use something like the following:
> library(SparseM)
> A
[,1] [,2] [,3]
[1,]003
[2,]200
[3,]040
> as.matrix.csr(A)@ra
[1] 3 2 4
there is a tolerance parameter in the coercion
"Mike Jones" <[EMAIL PROTECTED]> writes:
> hi all,
>
> i'm trying to get elements in a matrix into a vector. i need a
> "streamlined" way to do it as the way i'm doing it is not very
> serviceable. an example is a 3x3 matrix like
>
> 0 0 3
> 2 0 0
> 0 4 0
>
> to a vector like
>
> 3 2 4
You
hi all,
i'm trying to get elements in a matrix into a vector. i need a
"streamlined" way to do it as the way i'm doing it is not very
serviceable. an example is a 3x3 matrix like
0 0 3
2 0 0
0 4 0
to a vector like
3 2 4
thanks...mj
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