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Topic: determinant of a matrix of functions
Replies: 2   Last Post: Oct 7, 2013 10:16 AM

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Bruno Luong

Posts: 8,785
Registered: 7/26/08
Re: determinant of a matrix of functions
Posted: Oct 7, 2013 2:28 AM
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"Mohsen Rajaei" <mrajaei87@gmail.com> wrote in message <l2rpsf$lrd$1@newscl01ah.mathworks.com>...
> Dear all,
>
> I have a 2-by-2 matrix and want to get the determinant. This is easy when the elements are numbers. For example, when we have
> A=[1 2 ; 3 4]
> det(A) returns -2.
>
> But if I have a matrix of functions, for example
> A=@(x) [x x+1 ; x+2 x],
> I expect that det(A) returns a function which is -3*x-2; however, MATLAB cannot evaluate this and returns this error:
>
> Undefined function 'det' for input arguments of type 'function_handle'.
>
> How can I find the determinant of this matrix? Is there another way to solve this problem??


@d det(A(x))



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