Function evaluates a polynomial

Hello All,

I have an assignment that I'm having difficulty with. If someone would help me out that would be awesome.

Write a function that evaluates a polynomial. This function takes two arguments, coeff and s. coeff is a vector of any size and represents the coefficients of a polynomial in descending order. s is a scalar and represents the variable in the polynomial.

For example, POLY([ 2 4 0 -9], 3) outputs the value 2 * 3^3 + 4 * 3^2 – 9 POLY([ 2 0 4 0 -9], 3) outputs the value 2*3^4 + 4* 3^2 – 9

Write a main program that asks the user to enter a vector for the coefficients and plot the polynomial.

This is what I have so far: I have figured out the pseduocode for the for loop.

for i:[length(coeff)-1]
sum = vec[i] * X.^(L-1)
total = sum + total;

But I am having difficulty writing the code as I don't understand plots in Matlab. Any help or advise would be greatly appreciated.

Thanks, Ryan

[Guillaume]

Read this.

What is the problem you're having?

[Ryan Wu]

Hi Guillaume,

So I figured out the formula that goes in the for loop to evaluate a polynomial. But I have problem writing the code for the main program and plotting the polynomial.

I would really appreciate any help or guidance.

Thanks, Ryan

for i:[length(coeff)-1] sum = vec[i] * X.^(L-1) total = sum + total;