Andrew's Sine

The function

$$\psi(z)=\cases{ \sin\left({z\over c}\right)& $\vert z\vert<c\pi$\cr 0, & $\vert z\vert>c\pi$\cr}$$

which occurs in estimation theory.

See also Sine

References

Press, W. H.; Flannery, B. P.; Teukolsky, S. A.; and Vetterling, W. T. Numerical Recipes in FORTRAN: The Art of Scientific Computing, 2nd ed. Cambridge, England: Cambridge University Press, p. 697, 1992.