mirror of
https://git.planet-casio.com/Lephenixnoir/OpenLibm.git
synced 2025-01-01 06:23:39 +01:00
38 lines
1.1 KiB
Fortran
38 lines
1.1 KiB
Fortran
*DECK CDSCL
|
|
SUBROUTINE CDSCL (HMAX, N, NQ, RMAX, H, RC, RH, YH)
|
|
C***BEGIN PROLOGUE CDSCL
|
|
C***SUBSIDIARY
|
|
C***PURPOSE Subroutine CDSCL rescales the YH array whenever the step
|
|
C size is changed.
|
|
C***LIBRARY SLATEC (SDRIVE)
|
|
C***TYPE COMPLEX (SDSCL-S, DDSCL-D, CDSCL-C)
|
|
C***AUTHOR Kahaner, D. K., (NIST)
|
|
C National Institute of Standards and Technology
|
|
C Gaithersburg, MD 20899
|
|
C Sutherland, C. D., (LANL)
|
|
C Mail Stop D466
|
|
C Los Alamos National Laboratory
|
|
C Los Alamos, NM 87545
|
|
C***ROUTINES CALLED (NONE)
|
|
C***REVISION HISTORY (YYMMDD)
|
|
C 790601 DATE WRITTEN
|
|
C 900329 Initial submission to SLATEC.
|
|
C***END PROLOGUE CDSCL
|
|
INTEGER I, J, N, NQ
|
|
COMPLEX YH(N,*)
|
|
REAL H, HMAX, RC, RH, RMAX, R1
|
|
C***FIRST EXECUTABLE STATEMENT CDSCL
|
|
IF (H .LT. 1.E0) THEN
|
|
RH = MIN(ABS(H)*RH, ABS(H)*RMAX, HMAX)/ABS(H)
|
|
ELSE
|
|
RH = MIN(RH, RMAX, HMAX/ABS(H))
|
|
END IF
|
|
R1 = 1.E0
|
|
DO 10 J = 1,NQ
|
|
R1 = R1*RH
|
|
DO 10 I = 1,N
|
|
10 YH(I,J+1) = YH(I,J+1)*R1
|
|
H = H*RH
|
|
RC = RC*RH
|
|
RETURN
|
|
END
|