Writing program to evaluate a polynomial at point x=c
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function [output] = function_1(a,c) a=[a0 a1 ... an]; c=x; output=polyval(a,x);
This is the program I tried running, but will not work. I am having trouble how to have c as an input equal to x, and also my output polyval(a,x) is wrong.
回答（2 个）
Wayne King
2012-1-23
Hi Brianne, Your problem is that in polyval(), the first element in the input a is expected to be the coefficient for the N-th power of x. It looks like you have it listed from the 0-th order to the N-th order.
polyval([1 2 2],2)
evaluates x^2+2*x+2 at x=2
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