Sine curve - variable frequency

Hello everyone!

I am trying to create what is described in the title, I already browsed the forum and found definitions for variable amplitude sine curve, but nothing for variable frequency. Anyone knows how that could be done?

Thanks!

Replies to This Discussion

Permalink Reply by Ethan Gross on January 16, 2017 at 2:05pm

There's a lot of ways to vary the frequency by using the 'right' function inside the sine. Could you draw what you'd like yours to look like.

Permalink Reply by Katerina K on January 16, 2017 at 2:35pm

thanks for the response! something like that (see attached picture)

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image1.JPG, 566 KB

Permalink Reply by Laurent DELRIEU on January 16, 2017 at 2:27pm

You didn't find enough !

I joke I add also difficulties finding what I did not so long !!

http://www.grasshopper3d.com/forum/topics/sine-wave-along-a-curve-a...

A variable frequency sinus(f(x)) is quite simple to make, if f(x) is a monotonous function, it just increases or dicreases when x increase. If first derivative is constant, frequency is constant. If derivative changes frequency changes. You could use graph mapper followed by mass addition (same as integral). Example here

Permalink Reply by Katerina K on January 16, 2017 at 2:38pm

wow thanx Laurent! Excellent contribution!

Permalink Reply by Laurent DELRIEU on January 16, 2017 at 3:04pm

Here another example

Permalink Reply by Katerina K on January 16, 2017 at 3:03pm

on second thought i think i am doing something wrong. the curve appears to be discontinuous. I used the polyline output from david's part, what am i missing? I am looking for a result exactly like the smooth sine line on the last graph you sent above.

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