Unable to use "cholupdate" in a Simulink Matlab function made for C code generation

I have made a model in Simulink that contains a Matlab function block. When I try to use "cholupdate" I only get the following error: "Undefined function or variable 'cholupdate'."

Is it not possible to use cholupdate in a Simulink Matlab function (made for automatic C code generation)? I use Matlab R2013a and I can use cholupdate outside of Simulink.

"Chol" seems to work and I also get the help text for cholupdate in the editor.

If it is not possible to use cholupdate I would appreciate if someone could show me / post a link on how to implement it myself! I am looking for the Cholesky factor of then rank 1 downdate.

Answer 1

[Ryan Livingston]

CHOLUPDATE is not supported for code generation. You can see an exhaustive list of functions which are supported here:

http://www.mathworks.com/help/coder/ug/functions-supported-for-code-generation--alphabetical-list.html

Answer 2

[Mohd Aifaa]

try this for cholesky factor rank 1 update/downdate without using cholupdate

R1=chol(R'*R+x*x'); (update) R1=chol(R'*R-x*x'); (downdate)