# I need help with waves

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I know that I can generate waves using waves equation. Using: y = A * sinf((1/wavelenght)*angle + offset) This equation generates waves all along lets say x, and goes up and dawn in y. But I would like to generate single wave instead of many waves. Here is an exsample how it would look like: -------------------o ----------------o-----o --> --------------o---------o oooooooooooooo-----------oooooo ooo is the wave. How can I do that? Maybe I could modify wave equation or use something else?

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Hmm that looks like a gaussian curve. You can do it like a gaussian curve with mean value which corresponds to the maximum of that wave.

http://en.wikipedia.org/wiki/Gaussian_curve

Also if you want the limits of your wave to be lets say a and b, you can write a condition which will multiply your function with 0 in all places except between a and b.

Depends on where do you want to use it.

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The Gaussian courve looks a little cumbersome, I would like something simpler.
Good idea to multiply the wave outside [a,b] with 0, i could try that.

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I might be out of my league now ( I'm a beginner ) but if you want one wave, that is a wave shape, so the graph of a 2nd degree function ( not sure how to say it in english )... so basically you would have something like
[Source] f(x) = a*(x^2) + b*(x) + c [/Source]
.

Then you have y = f(x)

- Correct me if I am wrong please -

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Well, thats another way.
I think Ill use wave equation and restrict it on [a,b].

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that is general a second degree approximation to a curve. That is still not zero outside the bounds a-b. It cuts the x axis at its two roots (say a-b) but then it tends to infinity or minus infinity as long as you let it go. So you still need to multiply that by zero for all other places except between a-b.

Gaussian curve is not that cumbersome I suppose and pretty controlable in fact

"The parameter a is the height of the curve's peak, b is the position of the center of the peak, and c controls the width of the "bell"."

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cool, I never new that abaut gaussian curve

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