re [R] matrix^(-1/2)
re the discussion in November on this thread. I don't know about expm but
the problem must be equivalent to solve(B^(1/2)) and a solution will exist
iff B is invertible and has a square root A with A%*%A = B. For 2x2
matrices necessary and sufficient conditions for B to have
On Oct 31, 2009, at 9:33 PM, David Winsemius wrote:
On Oct 31, 2009, at 4:39 PM, Kajan Saied wrote:
Dear R-Help Team,
as a R novice I have a (maybe for you very simple question), how do
I get
the following solved in R:
Let R be a n x n matrix:
\mid R\mid^{-\frac{1}{2}}
solve(A) gives
A question, a comment, and an alternative answer to matrix^(-1/2):
QUESTION:
What's the status of the expm package, mentioned in the email you
cited from Martin Maechler, dated Apr 5 19:52:09 CEST 2008? I tried both
install.packages('expm') and
On Sun, 1 Nov 2009, spencerg wrote:
A question, a comment, and an alternative answer to matrix^(-1/2):
QUESTION:
What's the status of the expm package, mentioned in the email you cited
from Martin Maechler, dated Apr 5 19:52:09 CEST 2008? I tried both
install.packages('expm') and
Hi, Chuck:
Thanks very much, but why do I get package 'expm' is not
available from
install.packages(expm,repos=http://R-Forge.R-project.org;)?
Best Wishes,
Spencer Graves
Charles C. Berry wrote:
On Sun, 1 Nov 2009, spencerg wrote:
A question, a comment, and an
On Nov 1, 2009, at 1:46 PM, spencerg wrote:
Hi, Chuck:
Thanks very much, but why do I get package 'expm' is not
available from install.packages(expm,repos=http://R-Forge.R-project.org
)?
In my case I think it was it is because there is no 2.10 branch to
either the:
On Sun, 1 Nov 2009, David Winsemius wrote:
On Nov 1, 2009, at 1:46 PM, spencerg wrote:
Hi, Chuck:
Thanks very much, but why do I get package 'expm' is not available
from install.packages(expm,repos=http://R-Forge.R-project.org;)?
In my case I think it was it is because there is no
On Nov 1, 2009, at 3:12 PM, Charles C. Berry wrote:
On Sun, 1 Nov 2009, David Winsemius wrote:
On Nov 1, 2009, at 1:46 PM, spencerg wrote:
Hi, Chuck:
Thanks very much, but why do I get package 'expm' is not
available
from install.packages(expm,repos=http://R-Forge.R-
Dear R-Help Team,
as a R novice I have a (maybe for you very simple question), how do I get
the following solved in R:
Let R be a n x n matrix:
\mid R\mid^{-\frac{1}{2}}
solve(A) gives me the inverse of the matrix R, however not the ^(-1/2) of
the matrix...
Thank you very much in advance!
On Oct 31, 2009, at 4:39 PM, Kajan Saied wrote:
Dear R-Help Team,
as a R novice I have a (maybe for you very simple question), how do
I get
the following solved in R:
Let R be a n x n matrix:
\mid R\mid^{-\frac{1}{2}}
solve(A) gives me the inverse of the matrix R, however not the
10 matches
Mail list logo
