C **********************************************************************
C *                                                                    *
C *                                SOFTWARE LICENSING                  *
C *                                                                    *
C *                This program is free software; you can redistribute *
C *                it and/or modify it under the terms of the GNU      *
C *                General Public License as published by the Free     *
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C **********************************************************************

      SUBROUTINE MAXMIN (F, FMASK, IX, JY, FMAX , FMIN)
C     VERSION(09/27/90)
C
      SAVE
      DIMENSION F(IX,JY),FMASK(IX,JY)
C
      BIG=1.E20
C
      FMAX=-BIG
      FMIN=BIG
      DO 220 J=1, JY
      DO 220 I=1, IX
      IF(FMASK(I,J).EQ.0.) GO TO 220
      FMAX=AMAX1(FMAX,F(I,J))
      FMIN=AMIN1(FMIN,F(I,J))
  220 CONTINUE
C
      RETURN
      END