Hi guys,

I'm trying to plot a function that has the sigma operator in it.
I'm unable to do it with Smath.
I made a worksheet to demonstrate this issue.
It is a simple example that plots a square wave as function of the harmonics added to a sinusoidal wave.
First part is to show I plot a sinus function, which works just fine.
However when I try the square wave function with the summation operator in the function I does not work that way.
What I'm I doing wrong?

See attachment.square_wave.sm (9,48 KiB) scaricato 1093 volta(e).

Please help.
Best regards Sonya

Hi. You are not doing nothing wrong, just SMath sometimes requires for some functions the line() instruction as a wrapper for delay de evaluations. And I don't know a general rule for that.

square_wave.sm (7,87 KiB) scaricato 1117 volta(e).



Best regards.
Alvaro.

Wrote

What I'm I doing wrong ?

Indirectly, the argument of Sum is over the vector xc.
If you vectorize that argument, no need local definition
Mesh finer xc for higher maximum.
By same token, your system is ordinary Fourier.
You may want experiment Fourier/Fejer/Lanczos.
Please, confirm it works.
Cheers ... Jean.

Fourier Fejer Lanczos.sm (11,35 KiB) scaricato 1147 volta(e).