1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
*DECK SYBWIJ
SUBROUTINE SYBWIJ (NREG,MAXPTS,SIGW,PIJ)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Scattering reduction for collision probabilities.
*
*Copyright:
* Copyright (C) 2002 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): A. Hebert
*
*Parameters: input
* NREG total number of regions.
* MAXPTS first dimension of matrix PIJ.
* SIGW P0 within-group scattering macroscopic cross sections
* ordered by volume.
*
*Parameters: input/output
* PIJ reduced collision probability matrix on input and
* scattering-reduced collision probability matrix at output.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NREG,MAXPTS
REAL SIGW(NREG),PIJ(MAXPTS,NREG)
*----
* LOCAL VARIABLES
*----
REAL, ALLOCATABLE, DIMENSION(:,:) :: WIJ
*
ALLOCATE(WIJ(NREG,2*NREG))
DO 20 I=1,NREG
DO 10 J=1,NREG
WIJ(I,NREG+J)=PIJ(I,J)
WIJ(I,J)=-PIJ(I,J)*SIGW(J)
10 CONTINUE
WIJ(I,I)=1.0+WIJ(I,I)
20 CONTINUE
CALL ALSB(NREG,NREG,WIJ,IER,NREG)
IF(IER.NE.0) CALL XABORT('SYBWIJ: SINGULAR MATRIX.')
DO 40 J=1,NREG
DO 30 I=1,NREG
PIJ(I,J)=WIJ(I,NREG+J)
30 CONTINUE
40 CONTINUE
DEALLOCATE(WIJ)
RETURN
END
|
