Hello,
I want to plot the following truncated powr series with trigonometric coefficients:
sum(-y2*y3+8*(-1)^((k-1)*(1/2))*sinh(y2*Pi*k)*sin(k*Pi*y3)/(Pi^3*k^3*cosh((1/2)*k*Pi)), k = 1 .. 10)
but I get some strange terms with a strange term "I" in it which causes strange plots. I removed and it seems ok, why does this happen and what can I do to avoid it?
Thanks,
best regards,
Daniel
