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66 lines
1.9 KiB
Fortran
66 lines
1.9 KiB
Fortran
*DECK S1MERG
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SUBROUTINE S1MERG (TCOS, I1, M1, I2, M2, I3)
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C***BEGIN PROLOGUE S1MERG
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C***SUBSIDIARY
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C***PURPOSE Merge two strings of ascending real numbers.
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C***LIBRARY SLATEC
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C***TYPE SINGLE PRECISION (S1MERG-S, D1MERG-D, C1MERG-C, I1MERG-I)
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C***AUTHOR (UNKNOWN)
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C***DESCRIPTION
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C
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C This subroutine merges two ascending strings of numbers in the
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C array TCOS. The first string is of length M1 and starts at
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C TCOS(I1+1). The second string is of length M2 and starts at
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C TCOS(I2+1). The merged string goes into TCOS(I3+1).
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C
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C***SEE ALSO GENBUN
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C***ROUTINES CALLED SCOPY
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C***REVISION HISTORY (YYMMDD)
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C 801001 DATE WRITTEN
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C 891214 Prologue converted to Version 4.0 format. (BAB)
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C 900402 Added TYPE section. (WRB)
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C 901120 Modified to use IF-THEN-ELSE. Previous spaghetti code did
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C not compile correctly with optimization on the IBM RS6000.
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C (RWC)
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C 920130 Code name changed from MERGE to S1MERG. (WRB)
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C***END PROLOGUE S1MERG
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INTEGER I1, I2, I3, M1, M2
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REAL TCOS(*)
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C
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INTEGER J1, J2, J3
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C
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C***FIRST EXECUTABLE STATEMENT S1MERG
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IF (M1.EQ.0 .AND. M2.EQ.0) RETURN
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C
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IF (M1.EQ.0 .AND. M2.NE.0) THEN
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CALL SCOPY (M2, TCOS(I2+1), 1, TCOS(I3+1), 1)
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RETURN
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ENDIF
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C
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IF (M1.NE.0 .AND. M2.EQ.0) THEN
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CALL SCOPY (M1, TCOS(I1+1), 1, TCOS(I3+1), 1)
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RETURN
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ENDIF
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C
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J1 = 1
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J2 = 1
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J3 = 1
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C
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10 IF (TCOS(I1+J1) .LE. TCOS(I2+J2)) THEN
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TCOS(I3+J3) = TCOS(I1+J1)
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J1 = J1+1
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IF (J1 .GT. M1) THEN
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CALL SCOPY (M2-J2+1, TCOS(I2+J2), 1, TCOS(I3+J3+1), 1)
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RETURN
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ENDIF
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ELSE
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TCOS(I3+J3) = TCOS(I2+J2)
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J2 = J2+1
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IF (J2 .GT. M2) THEN
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CALL SCOPY (M1-J1+1, TCOS(I1+J1), 1, TCOS(I3+J3+1), 1)
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RETURN
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ENDIF
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ENDIF
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J3 = J3+1
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GO TO 10
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END
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