Using array as a for loop

I need to solve the polynomial x^4+nx^3-1 for n=-1,0,1 (without using for loop)

What I did is:

n=(-1:1:1);
co_poly=[1 n 0 0 -1];
roots(co_poly)

but it just put the array n inside the coefficients array.

Answer 1

[Geoff Hayes]

Harel - why don't you just iterate over each n and calculate the roots for that particular n? For example,

 for n=-1:1:1
     co_poly=[1 n 0 0 -1];
     roots(co_poly) 
 end

[Harel Harel Shattenstein]

I forgot, I should not use for

[Geoff Hayes]

Why can't you use for? Does the assignment prevent you from using that?