# MATLAB Polynomial Problem

• MATLAB
I am trying to get MATLAB to be able to produce a symbolic polynomial and am having some issues. The polynomial I would like it to produce is given a d and k,

X(k+1)-X(k-d)-X(k-d-1)-...-1

What I have so far is

Code:
k = 5;
d = 3;
syms X;

i = 0;
while (k-(d+i) >= 0)
terms(i+1) = k-(d+i);
i = i+1;
end

for j=1:i
poly = X^(k+1);
poly = inline(poly - X^(terms(j)));
end

This code is the example where k = 5, d = 3. The first while loop generates the terms of the polynomial, the second is meant to generate the polynomial, but it is not working.

In this example, the desired polynomial is

X6-X2-X-1

What the code is producing is

X6-1

Any ideas on what I can do to produce the correct polynomial?