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- *DECK I1MERG
- SUBROUTINE I1MERG (ICOS, I1, M1, I2, M2, I3)
- C***BEGIN PROLOGUE I1MERG
- C***SUBSIDIARY
- C***PURPOSE Merge two strings of ascending integers.
- C***LIBRARY SLATEC
- C***TYPE INTEGER (S1MERG-S, D1MERG-D, C1MERG-C, I1MERG-I)
- C***AUTHOR Boland, W. Robert, (LANL)
- C Clemens, Reginald, (PLK)
- C***DESCRIPTION
- C
- C This subroutine merges two ascending strings of integers in the
- C array ICOS. The first string is of length M1 and starts at
- C ICOS(I1+1). The second string is of length M2 and starts at
- C ICOS(I2+1). The merged string goes into ICOS(I3+1).
- C
- C***ROUTINES CALLED ICOPY
- C***REVISION HISTORY (YYMMDD)
- C 920202 DATE WRITTEN
- C***END PROLOGUE I1MERG
- INTEGER I1, I2, I3, M1, M2
- REAL ICOS(*)
- C
- INTEGER J1, J2, J3
- C
- C***FIRST EXECUTABLE STATEMENT I1MERG
- IF (M1.EQ.0 .AND. M2.EQ.0) RETURN
- C
- IF (M1.EQ.0 .AND. M2.NE.0) THEN
- CALL ICOPY (M2, ICOS(I2+1), 1, ICOS(I3+1), 1)
- RETURN
- ENDIF
- C
- IF (M1.NE.0 .AND. M2.EQ.0) THEN
- CALL ICOPY (M1, ICOS(I1+1), 1, ICOS(I3+1), 1)
- RETURN
- ENDIF
- C
- J1 = 1
- J2 = 1
- J3 = 1
- C
- 10 IF (ICOS(I1+J1) .LE. ICOS(I2+J2)) THEN
- ICOS(I3+J3) = ICOS(I1+J1)
- J1 = J1+1
- IF (J1 .GT. M1) THEN
- CALL ICOPY (M2-J2+1, ICOS(I2+J2), 1, ICOS(I3+J3+1), 1)
- RETURN
- ENDIF
- ELSE
- ICOS(I3+J3) = ICOS(I2+J2)
- J2 = J2+1
- IF (J2 .GT. M2) THEN
- CALL ICOPY (M1-J1+1, ICOS(I1+J1), 1, ICOS(I3+J3+1), 1)
- RETURN
- ENDIF
- ENDIF
- J3 = J3+1
- GO TO 10
- END
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