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Problems plotting the polygon of n-th complex roots


From: Tobal
Subject: Problems plotting the polygon of n-th complex roots
Date: Thu, 31 Oct 2013 02:23:55 -0700 (PDT)

Hi! I'm trying to plot the polygon of x^11=-1 but the polygon isn't drawn
correctly. I suspect the problem is about precision. Here's the code:

n=11;
for k=0:10
        x(k+1)=cos(((2*k+1)*pi)/n);
        y(k+1)=sin(((2*k+1)*pi)/n);
end

t=0:pi/30:2*pi;
x1=cos(t);
y1=sin(t);

clf();
plot(x,y,'b',x1,y1,'r')

And here is an image:

<http://octave.1599824.n4.nabble.com/file/n4658678/unidad.png> 



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