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authorJoseph Hunkeler <jhunkeler@gmail.com>2015-07-08 20:46:52 -0400
committerJoseph Hunkeler <jhunkeler@gmail.com>2015-07-08 20:46:52 -0400
commitfa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 (patch)
treebdda434976bc09c864f2e4fa6f16ba1952b1e555 /math/slalib/random.F__win
downloadiraf-linux-fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4.tar.gz
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+ REAL FUNCTION sla_RANDOM (XSEED)
+*+
+* - - - - - - -
+* R A N D O M
+* - - - - - - -
+*
+* Generate pseudo-random real number in the range 0 <= X < 1.
+*
+* (single precision)
+*
+* !!! Microsoft Fortran dependent !!!
+*
+* Given (but used first time only):
+* XSEED real an arbitrary real number
+*
+* The value returned is a pseudo-random number such that
+* 0 <= sla_RANDOM < 1.
+*
+* Called: RANDOM (Microsoft run-time library)
+*
+* P.T.Wallace Starlink 7 November 2003
+*
+*
+* License:
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program (see SLA_CONDITIONS); if not, write to the
+* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+* Boston, MA 02110-1301 USA
+*
+*-
+
+ IMPLICIT NONE
+
+ REAL XSEED
+
+ REAL X
+ LOGICAL FIRST
+ SAVE FIRST
+ DATA FIRST /.TRUE./
+
+
+ IF (FIRST) THEN
+ CALL SEED(NINT(MOD(XSEED*1.234E7,32E3))) ! Microsoft Fortran
+ FIRST=.FALSE.
+ END IF
+ CALL RANDOM(X) ! Microsoft Fortran
+ sla_RANDOM=X
+
+ END