DRAND, DRANDM

Portability Functions: Return double-precision random numbers in the range 0.0 through 1.0.

Module: USE DFPORT

Syntax

result = DRAND (iflag)
result = DRANDM (iflag)

iflag
(Input) INTEGER(4). Controls the way the random number is selected.

Results:

The result is of type REAL(8). Return values are:

Value of iflag	Selection process
1	The generator is restarted and the first random value is selected.
0	The next random number in the sequence is selected.
Otherwise	The generator is reseeded using iflag, then restarted, and the first random value is selected.

There is no difference between DRAND and DRANDM. Both functions are included to insure portability of existing code that references one or both of them.

Compatibility

CONSOLE STANDARD GRAPHICS QUICKWIN GRAPHICS WINDOWS DLL LIB

See Also: RANDOM_NUMBER, RANDOM_SEED

Example

USE DFPORT
REAL(8) num
INTEGER(4) f
f=1
CALL print_rand
f=0
CALL print_rand
f=22
CALL print_rand
CONTAINS
SUBROUTINE print_rand
num = drand(f)
print *, 'f= ',f,':',num
END SUBROUTINE
END