How to get smith form of a matrix in matlab

When i tried this code: syms x A = [x^2 + 3, (2*x - 1)^2; (x + 2)^2, 3*x^2 + 5] S = smithForm(A) I got following error: Undefined function or method 'smithForm' for input arguments of type 'sym'. How to resolve this.

Answer 1

[Roger Stafford]

Use 'smithform' only in mupad. See

http://www.mathworks.com/help/symbolic/mupad_ref/linalg-smithform.html

[sakshi ahuja]

As i don't have mupad so how can i resolve this. For instance when i used the same example as in the following link: http://in.mathworks.com/help/symbolic/smithform.html I have got that error (I am using matlab 2011).

[sakshi ahuja]

When i used mupad, then it is succesfully givivng me smith form but when i tried to evaluate [S, U, V]; it is showing error. Error is in this line: [S, U, V] := linalg::smithForm(A, All)

[Walter Roberson]

The MATLAB interface to smithform is available only from R2015b. Before that you need to interface into the MuPAD linalg routine.

sakshi, are you executing those commands inside a MuPAD notebook? If you are then what error message are you receiving?