How can I have Matlab create a polynomial function from a vector of coefficients without invoking some other implemented function?

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William Tanberg
William Tanberg 2018-10-31
评论： William Tanberg 2018-10-31
Here is some of my initial thinking.
function y = f(x)
clc;
clear;
a = [0,1,1,1,1,1];
n = length(a);
y = 0;
for i = 1:n
while i<=n
y = y + a(i)*x^(i-1);
end
end
end

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回答（2 个）

Erik Keever
Erik Keever 2018-10-31
If you're asking for the most efficient way to do it, call the function Mathworks implemented for us:
>> help polyval
POLYVAL Evaluate polynomial.
Y = POLYVAL(P,X) returns the value of a polynomial P evaluated at X. P
is a vector of length N+1 whose elements are the coefficients of the
polynomial in descending powers.
Y = P(1)*X^N + P(2)*X^(N-1) + ... + P(N)*X + P(N+1)|
Which is also an m-file you can view to see how it's done
madhan ravi
madhan ravi 2018-10-31
a = [0,1,1,1,1,1]
poly2sym(a) % requires symbolic toolbox

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