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Commit | Line | Data |
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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1996/04/01 15:02:24 mclareni | |
6 | * Mathlib gen | |
7 | * | |
8 | * | |
9 | #include "gen/pilot.h" | |
10 | SUBROUTINE RLSQP2(N,X,Y,A0,A1,A2,SD,IFAIL) | |
11 | IMPLICIT DOUBLE PRECISION (A-H,O-Z) | |
12 | REAL X,Y,A0,A1,A2,SD | |
13 | ||
14 | DIMENSION X(*),Y(*) | |
15 | ||
16 | PARAMETER (R0 = 0) | |
17 | ||
18 | A0=0 | |
19 | A1=0 | |
20 | A2=0 | |
21 | SD=0 | |
22 | IF(N .LE. 2) THEN | |
23 | IFAIL=1 | |
24 | ELSE | |
25 | FN=N | |
26 | XM=0 | |
27 | DO 1 K = 1,N | |
28 | XM=XM+X(K) | |
29 | 1 CONTINUE | |
30 | XM=XM/FN | |
31 | SX=0 | |
32 | SXX=0 | |
33 | SXXX=0 | |
34 | SXXXX=0 | |
35 | SY=0 | |
36 | SYY=0 | |
37 | SXY=0 | |
38 | SXXY=0 | |
39 | DO 2 K = 1,N | |
40 | XK=X(K)-XM | |
41 | YK=Y(K) | |
42 | XK2=XK**2 | |
43 | SX=SX+XK | |
44 | SXX=SXX+XK2 | |
45 | SXXX=SXXX+XK2*XK | |
46 | SXXXX=SXXXX+XK2**2 | |
47 | SY=SY+YK | |
48 | SYY=SYY+YK**2 | |
49 | SXY=SXY+XK*YK | |
50 | SXXY=SXXY+XK2*YK | |
51 | 2 CONTINUE | |
52 | DET=(FN*SXXXX-SXX**2)*SXX-FN*SXXX**2 | |
53 | IF(DET .GT. 0) THEN | |
54 | D2=(SXX*(FN*SXXY-SXX*SY)-FN*SXXX*SXY)/DET | |
55 | D1=(SXY-SXXX*D2)/SXX | |
56 | D0=(SY-SXX*D2)/FN | |
57 | IFAIL=0 | |
58 | ELSE | |
59 | IFAIL=-1 | |
60 | ENDIF | |
61 | ENDIF | |
62 | IF(IFAIL .EQ. 0 .AND. N .GT. 3) | |
63 | 1 SD=SQRT(MAX(R0,SYY-D0*SY-D1*SXY-D2*SXXY)/(N-3)) | |
64 | A0=D0+XM*(XM*D2-D1) | |
65 | A1=D1-2*XM*D2 | |
66 | A2=D2 | |
67 | RETURN | |
68 | END |