UNDF
This function evaluates the uniform cumulative distribution function.
Function Return Value
UNDF — Function value, the probability that a uniform random variable takes a value less than or equal to X. (Output)
Required Arguments
X — Argument for which the uniform cumulative distribution function is to be evaluated. (Input)
A — Location parameter of the uniform cumulative distribution function. (Input)
B — Value used to compute the scale parameter (B – A) of the uniform cumulative distribution function. (Input)
FORTRAN 90 Interface
Generic: UNDF (X, A, B)
Specific: The specific interface names are S_UNDF and D_UNDF.
FORTRAN 77 Interface
Single: UNDF (X, A, B)
Double: The double precision name is DUNDF.
Description
The function UNDF evaluates the uniform cumulative distribution function with location parameter A and scale parameter (B – A). The function definition is
Example
In this example, we evaluate the probability function at X = 0.65, A = 0.25, B = 0.75.
USE UMACH_INT
USE UNDF_INT
IMPLICIT NONE
INTEGER NOUT
REAL X, A, B, PR
CALL UMACH(2, NOUT)
X = 0.65
A = 0.25
B = 0.75
PR = UNDF(X, A, B)
WRITE (NOUT, 99999) X, A, B, PR
99999 FORMAT (' UNDF(', F4.2, ', ', F4.2, ', ', F4.2, ') = ', F6.4)
END
Output
UNDF(0.65, 0.25, 0.75) = 0.8000
