File: ouch.f

package info (click to toggle)
scilab 4.0-12
  • links: PTS
  • area: non-free
  • in suites: etch, etch-m68k
  • size: 100,640 kB
  • ctags: 57,333
  • sloc: ansic: 377,889; fortran: 242,862; xml: 179,819; tcl: 42,062; sh: 10,593; ml: 9,441; makefile: 4,377; cpp: 1,354; java: 621; csh: 260; yacc: 247; perl: 130; lex: 126; asm: 72; lisp: 30
file content (23 lines) | stat: -rw-r--r-- 985 bytes parent folder | download | duplicates (6) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
C/MEMBR ADD NAME=OUCH,SSI=0
      subroutine ouch
c!purpose
c   writes an error message when the algorithm fails to
c   converge.  there seem to be two conditions under which
c   the algorithm fails to converge: (1) the initial
c   guess for the extremal frequencies is so poor that
c   the exchange iteration cannot get started, or
c   (2) near the termination of a correct design,
c   the deviation decreases due to rounding errors
c   and the program stops.  in this latter case the
c   filter design is probably acceptable, but should
c   be checked by computing a frequency response.
c!
      common /oops/niter,iout
      write(iout,1)niter
    1 format(1x,'************ failure to converge **********',/,
     1       1x,'probable cause is machine rounding error',/,
     2       1x,'- number of iterations =',i4,/,
     3       1x,'if the number of iterations exceeds 3 the design',/
     4       1x,'may be correct, but should be verified with an fft')
      return
      end