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

mupad

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,

Best Answer

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

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MATLAB: How to create a Mupad symbolic variable as a matrix

Do you need to do this at the MATLAB level or at the MuPAD level?

Is there a particular data type that the matrix will hold (e.g., numbers only), or do you need a general symbolic matrix?

MATLAB: Problem using solve (Symbolic Toolbox)

syms qv positive real;

and

syms L t positive real;

and when you solve for qv, you say you are expecting the answer

-2*t*L^3/15

but t and L are positive, so 2*t*L^3/15 would be positive, and negative of that would be negative. So if L and t are positive, qv would have to be negative. But you told it that qv is positive. So there is no solution for qv.

The -(2*L^2*t)/15 that madhan came up with has the same problem, that it would be negative.

Best Answer

Related Solutions

MATLAB: How to create a Mupad symbolic variable as a matrix

MATLAB: Problem using solve (Symbolic Toolbox)

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