im trying to plot this function, y= (exp(1i.*k​.*pi./10).​*(1-exp(-1​i.*k.*2.*p​i)))./(20.​*(-1+(exp(​1i.*k.*pi.​/10))));

syms y k

y= (exp(1i.*k.*pi./10).*(1-exp(-1i.*k.*2.*pi)))./(20.*(-1+(exp(1i.*k.*pi./10))));

fplot(y)

[amin yasin]

i dont know why this do not work,

i would love to have some help.

thanks in advance

[Torsten]

Does this work ?

syms x y(x)
y(x) = (exp(1i.*x.*pi./10).*(1-exp(-1i.*x.*2.*pi)))./(20.*(-1+(exp(1i.*x.*pi./10))));
fplot(abs(y(x)),[-5 5])

Answer 1

[Paul]

syms y k 
y= (exp(1i.*k.*pi./10).*(1-exp(-1i.*k.*2.*pi)))./(20.*(-1+(exp(1i.*k.*pi./10))));

y is complex valued, e.g.

subs(y,k,0.1)

ans = 

I'm not sure what fplot() tries to do with a complex valued function. But the real questions is what plot is desired. Perhaps the magnitude of y?

fplot(abs(y))