Hi everyone,
I am looking to use R as a MATLAB replacement for linear algebra.
I've done a fairly good job for finding replacements for most of the
functions I'm interested in, I
John Fox wrote a program for implementing the reduced row echelon form
of a matrix (by doing the Gauss-Jordan
I'd like to have a three dimensional array of matrices. I thought I could
construct a five dimensional array to have the three dimensional array of
matrices. However, not all of the matrices in the array have the same
dimensions, which seems to mean I can't use a five dimensional array.
,]00010
[5,]00001
Thanks again for the help!
-Scott
Original message
Date: Mon, 21 May 2007 04:57:40 -0400
From: jim holtman [EMAIL PROTECTED]
Subject: Re: [R] an array of matrices
To: Scott Hyde [EMAIL PROTECTED]
Cc: r-help
was up to date.
-Scott
Original message
Date: Wed, 16 May 2007 09:32:44 +0200
From: Martin Maechler [EMAIL PROTECTED]
Subject: Re: [R] Reshape a sparse matrix
To: Scott Hyde [EMAIL PROTECTED]
Cc: r-help@stat.math.ethz.ch
Scott == Scott Hyde [EMAIL PROTECTED]
on Tue, 15 May 2007 17
Hi,
I'd like to reshape a sparse matrix generated from the Matrix package. I can't
seem to do it with the command
dim(A) - c(6,9)
which works perfectly with the base package matrices, but with the sparse
matrices it errors with
Error in dim(A) = c(6, 9) : dim- : invalid first argument
I wrote a function to reshape a sparse matrix of type dgTmatrix
It is as follows:
reshape.matrix - function(A,r,c) {
## Reshape a matrix from the Matrix package
## of type dgTmatrix
##
r_old - [EMAIL PROTECTED]
c_old - [EMAIL PROTECTED]
if(as.numeric(r_old*c_old) !=
