| | DEFUN_DLD (gammainc, args,,"-*- texinfo -*-\n\
@deftypefn {Mapping Function} {} gammainc (@var{x}, @var{a})\n\
Compute the normalized incomplete gamma function,\n\
@iftex\n\
@tex\n\
$$\n\
\\gamma (x, a) = {\\displaystyle\\int_0^x e^{-t} t^{a-1} dt \\over \\Gamma (a)}\n\
$$\n\
@end tex\n\
@end iftex\n\
@ifnottex\n\
\n\
@smallexample\n\
x\n\
1 /\n\
gammainc (x, a) = --------- | exp (-t) t^(a-1) dt\n\
gamma (a) /\n\
t=0\n\
@end smallexample\n\
\n\
@end ifnottex\n\
with the limiting value of 1 as @var{x} approaches infinity.\n\
The standard notation is @math{P(a,x)}, e.g., Abramowitz and Stegun (6.5.1).\n\
\n\
If @var{a} is scalar, then @code{gammainc (@var{x}, @var{a})} is returned\n\
for each element of @var{x} and vice versa.\n\
\n\
If neither @var{x} nor @var{a} is scalar, the sizes of @var{x} and\n\
@var{a} must agree, and @var{gammainc} is applied element-by-element.\n\
@seealso{gamma, lgamma}\n\
@end deftypefn") |
