ploting function that has the summation sign in it.

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ploting function that has the summation sign in it. - ploting function that has the summation sign in it.

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Pe1bjt		#1 Posted : 11 August 2023 21:47:51(UTC)
Rank: Newbie Groups: Registered Joined: 11/08/2023(UTC) Posts: 1 Location: brabant		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 (10kb) downloaded 5 time(s). Please help. Best regards Sonya


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Razonar		#2 Posted : 11 August 2023 22:26:31(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,356 Was thanked: 815 time(s) in 516 post(s)		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 (8kb) downloaded 20 time(s). Best regards. Alvaro.

1 user thanked Razonar for this useful post.		on 12/08/2023(UTC)
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Jean Giraud		#3 Posted : 12 August 2023 16:18:38(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Pe1bjt 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 (12kb) downloaded 12 time(s).


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