RALPR
This function evaluates the Rayleigh probability density function.
Function Return Value
RALPR — Function value, the value of the probability density function. (Output)
Required Arguments
X — Argument for which the Rayleigh probability density function is to be evaluated. (Input)
ALPHA — Scale parameter of the Rayleigh probability function. (Input)
FORTRAN 90 Interface
Generic: RALPR (X, ALPHA)
Specific: The specific interface names are S_RALPR and D_RALPR.
FORTRAN 77 Interface
Single: RALPR (X, ALPHA)
Double: The double precision name is DRALPR.
Description
The function RALPR evaluates the Rayleigh probability density function, which is a special case of the Weibull probability density function where GAMMA is equal to 2.0, and is defined as
Example
In this example, we evaluate the Rayleigh probability density function at X = 0.25, ALPHA = 0.5.
USE UMACH_INT
USE RALPR_INT
IMPLICIT NONE
INTEGER NOUT
REAL X, ALPHA, PR
CALL UMACH(2, NOUT)
X = 0.25
ALPHA = 0.5
PR = RALPR(X, ALPHA)
WRITE (NOUT, 99999) X, ALPHA, PR
99999 FORMAT (' RALPR(', F4.2, ', ', F4.2, ') = ', F6.4)
END
Output
RALPR(0.25, 0.50) = 0.8825
