Displaying 7 results from an estimated 7 matches for "matrixexp".
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matrixes
2009 Jul 31
1
Matrix Integral
Hi,
Any help on this would be appreciated:
I need to integrate where K is a 4x4 matrix, and SIGMA is a 4x4 matrix from
say a to b, i.e. 0 to 5:
integral MatrixExp(-K * s) %*% SIGMA %*% t(SIGMA) %*% MatrixExp(t(-K) s) ds
t is tranpose , %*% : matrix mult , MatrixExp : matrix exponential
I've use integrate before on univariate functions like f(x) = x^2 which is
fine but when doing this on a matrix I run into problems. All I intuitively
need to do is do t...
2006 Jan 28
1
Complex Matrix Exponentials.
Hello,
I was curious if there was a complex valued matrix exponential function
available for R? I have some Laplace transforms of occupation times
for a hidden Markov model. The matrix exponential function in the msm
package does not seem to handle complex values. For example
> MatrixExp(diag(1i,2))
[,1] [,2]
[1,] 1 0
[2,] 0 1
Warning message:
imaginary parts discarded in coercion
Thanks in advance for your help,
Andrew Royal
University of Calgary
2008 Nov 11
3
exponential of a matrix
Is the matrix exponential available in some package?
The cannonical reference is "Nineteen dubious ways to take the exponential of a matrix". (Love that title)
Terry T.
2004 Nov 05
0
R check passes code and docs that don't match
...errors ... OK
* checking R files for library.dynam ... OK
* checking S3 generic/method consistency ... OK
* checking replacement functions ... OK
* checking foreign function calls ... OK
* checking Rd files ... OK
* checking for missing documentation entries ... WARNING
Undocumented code objects:
MatrixExp absorbing.mspath coef.mspath crudeinits.mspath deltamethod
ematrix.mspath expit expitsum expsum hazard.mspath lik.mspath logit
mspath.check.consistency mspath.check.ematrix mspath.check.model
mspath.check.qmatrix mspath.check.state mspath.check.times
mspath.form.output mspath.process.covs m...
2004 Jan 20
4
matrix exponential: M^0
> -----Original Message-----
> From: Federico Calboli
> Sent: Tuesday, January 20, 2004 5:40 PM
> To: r-help
> Subject: [R] matrix exponential: M^0
>
> I would like to ask why the zeroeth power of a matrix gives me a matrix
> of ones rather than the identity matrix:
>
> > D<-rbind(c(0,0,0),c(0,0,0),c(0,0,0))
> > D<-as.matrix(D)
> > D
>
2008 May 06
5
How do I write a sum of matrixes??
Hello best helpers,
I am a new user and I have been struggling for hours. So finally I decide to ask you:
If I have a matrix P, and P.2 = P%*%P, and P.3=P.2%*%P
is there a function to calculate the power of a matrix?? if not how can i do:
for (i in 1:10) {P.i=P^i}
after this I need to sum them up and my problem is to combine P and i to P.i can anyone help me please???
Thanks and have a nice
2007 May 06
7
A function for raising a matrix to a power?
Hi,
Is there a function for raising a matrix to a power? For example if you like to compute A%*%A%*%A, is there an abbreviation similar to A^3?
Atte Tenkanen
> A=rbind(c(1,1),c(-1,-2))
> A
[,1] [,2]
[1,] 1 1
[2,] -1 -2
> A^3
[,1] [,2]
[1,] 1 1
[2,] -1 -8
But:
> A%*%A%*%A
[,1] [,2]
[1,] 1 2
[2,] -2 -5