5000'  NAME--NORDEV
5010'
5020'  DESCRIPTION--A SUBROUTINE WHICH GENERATES RANDOM NORMAL
5030'  DEVIATES WITH MEAN 0 AND VARIANCE 1.
5040'
5050'  SOURCE--UNKNOWN
5060'
5070'  INSTRUCTIONS--THIS SUBROUTINE USES THE VARIABLES Z9,Z8, AND Z7.
5080'  THE VARIABLE R0 IS THE DEVIATE. AVOID USING THESE VARAIBLES
5090'  IN THE MAIN PROGRAM.
5100'
5110'
5120'  *  *  *  *  *  *   SUBROUTINE    *  *  *  *  *  *  *
5130'
5140  IF Z7 = 2.347 THEN 5210
5150  LET Z7 = 2.347
5160  LET Z9 = SQR(-2*LOG(RND))
5170  LET Z8 = 6.2831853*RND
5180  LET R0 = Z9*COS(Z8)
5190  LET Z9 = Z9*SIN(Z8)
5200  GOTO 5230
5210  LET R0 = Z9
5220  LET Z7 = 1
5230 RETURN