Telling MuPad that Symbolic Variable is a Matrix and not a Scalar (Symbolic Matrix Operations)

Hi,

is there a way to tell MuPad that symbolic variables A and B are matrices and not scalars? It usually sorts the variables in an alphabetic order. Hence, B*A produces A*B, which won't be correct in case of matrices.

I need to re-arrange large equations that involve matrices and would like to do this in MuPad.

Thanks in advance.

Cheers,

m

Answer 1

[Walter Roberson]

Which release do you have? If you have 2010b or later, you can do it, provided you assign specific dimensions: see the documentation for sym

That method is new for 2010b; before that you have to assign it a matrix of symbolic values, such as I show here

Answer 2

[MIchael]

Hi Walter,

sorry for the late reply. Indeed, I am using an older version, and therefore cannot use this (useful) feature.

Thanks for your reply, it has given the right answer.

Michael

Answer 3

[Jian Wang]

Hi, I am having the same problem in Mupad. The sym command given above can't be used in Mupad, right? How to do that in Mupad?

[Walter Roberson]

Jian,

You can use the MuPAD array() call,

http://www.mathworks.com/help/toolbox/mupad/stdlib/array.html