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- *DECK C1MERG
- SUBROUTINE C1MERG (TCOS, I1, M1, I2, M2, I3)
- C***BEGIN PROLOGUE C1MERG
- C***SUBSIDIARY
- C***PURPOSE Merge two strings of complex numbers. Each string is
- C ascending by the real part.
- C***LIBRARY SLATEC
- C***TYPE COMPLEX (S1MERG-S, D1MERG-D, C1MERG-C, I1MERG-I)
- C***AUTHOR (UNKNOWN)
- C***DESCRIPTION
- C
- C This subroutine merges two ascending strings of numbers in the
- C array TCOS. The first string is of length M1 and starts at
- C TCOS(I1+1). The second string is of length M2 and starts at
- C TCOS(I2+1). The merged string goes into TCOS(I3+1). The ordering
- C is on the real part.
- C
- C***SEE ALSO CMGNBN
- C***ROUTINES CALLED CCOPY
- C***REVISION HISTORY (YYMMDD)
- C 801001 DATE WRITTEN
- C 891214 Prologue converted to Version 4.0 format. (BAB)
- C 900402 Added TYPE section. (WRB)
- C 910408 Modified to use IF-THEN-ELSE. Make it look like MERGE
- C which was modified earlier due to compiler problems on
- C the IBM RS6000. (RWC)
- C 920130 Code name changed from CMPMRG to C1MERG. (WRB)
- C***END PROLOGUE C1MERG
- INTEGER I1, I2, I3, M1, M2
- COMPLEX TCOS(*)
- C
- INTEGER J1, J2, J3
- C
- C***FIRST EXECUTABLE STATEMENT C1MERG
- IF (M1.EQ.0 .AND. M2.EQ.0) RETURN
- C
- IF (M1.EQ.0 .AND. M2.NE.0) THEN
- CALL CCOPY (M2, TCOS(I2+1), 1, TCOS(I3+1), 1)
- RETURN
- ENDIF
- C
- IF (M1.NE.0 .AND. M2.EQ.0) THEN
- CALL CCOPY (M1, TCOS(I1+1), 1, TCOS(I3+1), 1)
- RETURN
- ENDIF
- C
- J1 = 1
- J2 = 1
- J3 = 1
- C
- 10 IF (REAL(TCOS(J1+I1)) .LE. REAL(TCOS(I2+J2))) THEN
- TCOS(I3+J3) = TCOS(I1+J1)
- J1 = J1+1
- IF (J1 .GT. M1) THEN
- CALL CCOPY (M2-J2+1, TCOS(I2+J2), 1, TCOS(I3+J3+1), 1)
- RETURN
- ENDIF
- ELSE
- TCOS(I3+J3) = TCOS(I2+J2)
- J2 = J2+1
- IF (J2 .GT. M2) THEN
- CALL CCOPY (M1-J1+1, TCOS(I1+J1), 1, TCOS(I3+J3+1), 1)
- RETURN
- ENDIF
- ENDIF
- J3 = J3+1
- GO TO 10
- END
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