Evaluating polynomials in Matlab

[qubits135]

I defined x as a syms, then work with polynomials involving x. But then I can't find an evaluation command for these polynomials at some x value. Anyone knows how I can get it to work? Thank you in advance.

There's another system where you can define polynomials just like matrices, e.g. x^2+1 as [1 0 1]. But they only have elementary manipulation, and it becomes really cumbersome doing integral or derivative. (that was why I went the traditional way, which is the one mentioned above).

Thanx

 

[Wrichik Basu]

For evaluating symbolic expressions, you need to use the subs function. Refer to this:
https://in.mathworks.com/help/symbolic/use-subs-to-evaluate-expressions-and-functions.html

 

[osilmag]

The command polyval(h,x), where 'h' is a vector of the coefficients of an nth degree polynomial, evaluates a polynomial at each point 'x'.