Miscellaneous tips for MATLAB
From LiteratePrograms
Polynomials
Here is a simple function to compute the value of a polynomial function on a domain.
The polynomial coefficients are stored in a vector:
P = [1 2 3];
means:
P(X) = X2 + 2X + 3
and more generally:
simple_poly.m
function y = simple_poly(x, P)
y=(repmat(x(:),1,length(P)).^repmat(length(P)-1:-1:0,length(x),1)) * P(:);
or as an anonymous function:
f=@(x,a)((repmat(x(:),1,length(a)).^repmat(length(a)-1:-1:0,length(x),1)) * a(:))
External links
- The MATLAB built-in polyval function
| Download code |