# what is the equation to get this type of a curve?

what must be the equation to get this type of a curve??

the curve must increase from -infinity to 0 and then decrease again to +infinity.

Thank you

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Such a curve is not algebraic: those are by definition given by polynomials and intersect each line (or other curve) in finitely many other points by Bézout.. That is clearly not the case in your picture.. –  Joachim Aug 18 '12 at 6:45
(There used to be a tag "algebraic-curves") –  Joachim Aug 18 '12 at 8:09

You can try multiplying a $\sin$ wave with a Gaussian, e.g: $$\sin(5x)e^{-x^2/2}$$

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Related: Gabor filter, Morlet wavelet. –  Rahul Aug 18 '12 at 6:56