Sorry. I erred somewhere in making the original M1 matrix using sampling call
in the spMatrix function. I still don't really understand why the matrix
values do not match exactly with M1@x. If I regenerate M1 this way...
i=c(1:5,5:1)
j=c(1:5,2:6)
x=rnorm(10,2)
M1 -
Douglas Bates ba...@stat.wisc.edu writes:
On Tue, Dec 20, 2011 at 8:20 AM, Jean V Adams jvad...@usgs.gov wrote:
Hi Jean,
khai wrote on 12/19/2011 11:26:55 PM:
Hi,
I'm very new to working with sparse matrices and would like to know how
I
can column permute a sparse matrix. Here is a
khai wrote on 12/19/2011 11:26:55 PM:
Hi,
I'm very new to working with sparse matrices and would like to know how
I
can column permute a sparse matrix. Here is a small example:
M1 -
spMatrix(nrow=5,ncol=6,i=sample(5,15,replace=TRUE),j=sample(6,
On Tue, Dec 20, 2011 at 8:20 AM, Jean V Adams jvad...@usgs.gov wrote:
Hi Jean,
khai wrote on 12/19/2011 11:26:55 PM:
Hi,
I'm very new to working with sparse matrices and would like to know how
I
can column permute a sparse matrix. Here is a small example:
M1 -
Thanks very much for responses. The 2 suggestions each do a part of what I
want. Jean's proposal permutes nonzero elements within each row but shifts
the location of the nonzero element around in the j slot of each i row. And
Douglas's idea keeps the second part but permutes the entire x slot
khai wrote on 12/20/2011 01:24:10 PM:
Thanks very much for responses. The 2 suggestions each do a part of what
I
want. Jean's proposal permutes nonzero elements within each row but
shifts
the location of the nonzero element around in the j slot of each i row.
And
Douglas's idea keeps the
Hi,
I'm very new to working with sparse matrices and would like to know how I
can column permute a sparse matrix. Here is a small example:
M1 -
spMatrix(nrow=5,ncol=6,i=sample(5,15,replace=TRUE),j=sample(6,15,replace=TRUE),x=round_any(rnorm(15,2),0.001))
M1
5 x 6 sparse Matrix of class
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