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//example(3.8)
//a,b & e are the modulus coeff of x^0,x^1,x^4
c=[-1 1 -1 -1 1]
a=1;
b=1;
e=1;
n=4
p4=poly(c,'x','coeff')
p=n*a/b
q=(a/e)^(1/n)
roots(p4)
//from here we found that only 2 real roots,other two are complex roots
xset('window',0);
x=-2:0.1:3; // defining the range of x.
deff('[y]=f(x)','y=x^4-x^3-x^2+x-1'); //defining the function
y=feval(x,f);
a=gca();
a.y_location = "origin";
a.x_location = "origin";
plot(x,y) // instruction to plot the graph
title(' y =x^4-x^3-x^2+x-1')
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