Cholesky factorization on symbolic matrix

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Chien-Chia Huang
Chien-Chia Huang 2011-5-16
Hi all,
I want to use Cholesky factorization on some symbolic matrices but I am still working with R2007b, quite an old version.
I met error message when I did it.
Is there any other way out to do this in R2007b?
--
I do have an authorized R2011a but the toolboxes are not included. (I have no idea why my school did not purchase the full version.)
So guess I cannot, for this time being, work with R2011a unless I know how to transfer all the toolboxes from my current version to the latest one.
Could anyone tell me how to do this? (Just copy all the files?)
Thanks in advance.

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采纳的回答

Kai Gehrs
Kai Gehrs 2011-5-17
If you want to do the computation inside of MuPAD, you can use
n:= 4:
A:= matrix([[c.i.j $ i = 1..n] $ j = 1..n]):
linalg::factorCholesky(A,NoCheck)
The option 'NoCheck' means that it is not checked whether A is symmetric and positive definite.
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Chien-Chia Huang
Chien-Chia Huang 2011-5-17
Thanks, Kai. But MuPad is contained in new Matlab version. I did not found it in my "antique" R2007b.

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更多回答（1 个）

Walter Roberson
Walter Roberson 2011-5-16
Toolboxes cannot be transferred between versions.
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Chien-Chia Huang
Chien-Chia Huang 2011-5-17
Thanks Walter. I did exactly what you say in your comment and got what I wanted.
Also to Andrei, I have tried and it works. But the answer is not as "pretty" as that in Maple. What should "C" be? what I input is C = [1 a b c;a 1 d e;b d 1 f;c e f 1].
Walter Roberson
Walter Roberson 2011-5-17
I would suggest
maple('Chol := C->LinearAlgebra[LUDecomposition](Matrix(C,form=symmetric),method=Cholesky)':);
syms a b c d e f
C = [1 a b c;a 1 d e;b d 1 f;c e f 1];
maple('Chol', C);

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