catan, catanf, catanl

Retrieves the arctangent of a complex number with branch cuts outside the interval [-1; +1] along the imaginary axis.


_Dcomplex catan( _Dcomplex z );
_Fcomplex catanf( _Fcomplex z );
_Lcomplex catanl( _Lcomplex z );
_Fcomplex catan( _Fcomplex z );  // C++ only
_Lcomplex catan( _Lcomplex z );  // C++ only


A complex number that represents an angle, in radians.

Return value

The arctangent of z, in radians. The result is unbounded along the imaginary axis, and in the interval [-π/2; +π/2] along the real axis.


Because C++ allows overloading, you can call overloads of catan that take and return _Fcomplex and _Lcomplex values. In a C program, catan always takes and returns a _Dcomplex value.


Routine C header C++ header
catan, catanf, catanl <complex.h> <ccomplex>

For more compatibility information, see Compatibility.

See also

Alphabetical function reference
catanh, catanhf, catanhl
ctanh, ctanhf, ctanhl
csinh, csinhf, csinhl
casinh, casinhf, casinhl
ccosh, ccoshf, ccoshl
cacosh, cacoshf, cacoshl
cacos, cacosf, cacosl
ctan, ctanf, ctanl
csin, csinf, csinl
casin, casinf, casinl
ccos, ccosf, ccosl
csqrt, csqrtf, csqrtl