mirror of
https://git.planet-casio.com/Lephenixnoir/OpenLibm.git
synced 2025-01-01 06:23:39 +01:00
60 lines
1.6 KiB
Fortran
60 lines
1.6 KiB
Fortran
*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
|