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49 lines
1.3 KiB
49 lines
1.3 KiB
2 years ago
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C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C------------------------------------------------------------- ************
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C ISMAX
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C ************
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INTEGER FUNCTION ISMAX(N,SX,INCX)
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C FINDS THE INDEX OF ELEMENT WITH MAX. VALUE.
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C JACK DONGARRA, LINPACK, 3/11/78.
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INTEGER I,INCX,IX,N
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REAL SX(*),SMAX
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ISMAX = 0
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IF (N .LT. 0) STOP
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IF (N .EQ. 0) RETURN
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ISMAX = 1
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IF (N .EQ. 1) RETURN
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IF (INCX .EQ. 1) GO TO 20
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C CODE FOR INCREMENT NOT EQUAL TO 1
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IX = 1
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IF (INCX .LE. 0) IX = (-N+1)*INCX + 1
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SMAX = SX(IX)
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IX = IX + INCX
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DO 10 I = 2,N
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IF (SX(IX) .LE. SMAX) GO TO 5
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ISMAX = I
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SMAX = SX(IX)
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5 IX = IX + INCX
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10 CONTINUE
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RETURN
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C CODE FOR INCREMENT EQUAL TO 1
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20 SMAX = SX(1)
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DO 30 I = 2,N,1
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IF (SX(I) .LE. SMAX) GO TO 30
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ISMAX = I
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SMAX = SX(I)
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30 CONTINUE
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RETURN
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END
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