GEODF
This function evaluates the discrete geometric cumulative probability distribution function.
Function Return Value
GEODF — Function value, the probability that a geometric random variable takes a value less than or equal to IX. (Output)
Required Arguments
IX — Argument for which the geometric cumulative distribution function is to be evaluated. (Input)
PIN — Probability parameter for each independent trial (the probability of success for each independent trial). PIN must be in the open interval (0, 1). (Input)
FORTRAN 90 Interface
Generic: GEODF (IX, PIN)
Specific: The specific interface names are S_GEODF and D_GEODF.
FORTRAN 77 Interface
Single: GEODF (IX, PIN)
Double: The double precision name is DGEODF.
Description
The function GEODF evaluates the discrete geometric cumulative probability distribution function with parameter p = PIN, defined
The return value is the probability that up to x trials would be observed before observing a success.
Example
In this example, we evaluate the probability function at IX = 3, PIN = 0.25.
USE UMACH_INT
USE GEODF_INT
IMPLICIT NONE
INTEGER NOUT, IX
REAL PIN, PR
CALL UMACH(2, NOUT)
IX = 3
PIN = 0.25e0
PR = GEODF(IX, PIN)
WRITE (NOUT, 99999) IX, PIN, PR
99999 FORMAT (' GEODF(', I2, ', ', F4.2, ') = ', F10.6)
END
Output
GEODF( 3, 0.25) = 0.683594
