File: dcosti.f

package info (click to toggle)
python-scipy 0.5.2-0.1
  • links: PTS
  • area: main
  • in suites: etch, etch-m68k
  • size: 33,888 kB
  • ctags: 44,231
  • sloc: ansic: 156,256; cpp: 90,347; python: 89,604; fortran: 73,083; sh: 1,318; objc: 424; makefile: 342
file content (19 lines) | stat: -rw-r--r-- 476 bytes parent folder | download | duplicates (9) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
      SUBROUTINE DCOSTI (N,WSAVE)
      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
      DIMENSION       WSAVE(1)
      DATA PI /3.14159265358979323846D0/
      IF (N .LE. 3) RETURN
      NM1 = N-1
      NP1 = N+1
      NS2 = N/2
      DT = PI/FLOAT(NM1)
      FK = 0.0D0
      DO 101 K=2,NS2
         KC = NP1-K
         FK = FK+1.0D0
         WSAVE(K) = 2.0D0*SIN(FK*DT)
         WSAVE(KC) = 2.0D0*COS(FK*DT)
  101 CONTINUE
      CALL DFFTI (NM1,WSAVE(N+1))
      RETURN
      END