CATAN(3) Linux Programmer's Manual CATAN(3)NAME
catan, catanf, catanl - complex arc tangents
double complex catan(double complex z);
float complex catanf(float complex z);
long double complex catanl(long double complex z);
Link with -lm.
The catan() function calculates the complex arc tangent of z. If
y = catan(z), then z = ctan(y). The real part of y is chosen in the
catan(z) = 1 / 2i clog((1 + iz) / (1 - iz))
These functions first appeared in glibc in version 2.1.
SEE ALSOccos(3), clog(3), complex(7)COLOPHON
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