Compute the normalized incomplete gamma function, with the limiting value of 1 as x approaches infinity. The standard notation is P(a,x), e.g. Abramowitz and Stegun (6.5.1).
If a is scalar, then
gammainc (
x,
a)
is returned for each element of x and vice versa.If neither x nor a is scalar, the sizes of x and a must agree, and gammainc is applied element-by-element.