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55 lines
1.4 KiB
55 lines
1.4 KiB
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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SUBROUTINE INDEXI_FQ (NMAX, IARRAY, N, INDX)
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C***********************************************************************
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C INDEXI - SORT THE N ELEMENTS OF IARRAY WHOSE POSITION IS STORED
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C IN INDX. ONLY THE ORDER OF THE INDEX ARRAY, INDX, IS
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C MODIFIED
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C***********************************************************************
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DIMENSION IARRAY(NMAX), INDX(N)
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L = N/2 + 1
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IR = N
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100 CONTINUE
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IF (L .GT. 1) THEN
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L = L - 1
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INDXT = INDX(L)
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JQ = IARRAY(INDXT)
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ELSE
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INDXT = INDX(IR)
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JQ = IARRAY(INDXT)
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INDX(IR) = INDX(1)
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IR = IR - 1
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IF (IR .EQ. 1) THEN
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INDX(1) = INDXT
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RETURN
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END IF
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END IF
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I = L
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J = L + L
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110 CONTINUE
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IF (J .LE. IR) THEN
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IF (J .LT. IR) THEN
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IF (IARRAY(INDX(J)) .LT. IARRAY(INDX(J + 1))) J = J + 1
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END IF
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IF (JQ .LT. IARRAY(INDX(J))) THEN
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INDX(I) = INDX(J)
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I = J
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J = J + J
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ELSE
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J = IR + 1
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END IF
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GO TO 110
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END IF
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INDX(I) = INDXT
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GO TO 100
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END
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