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Last change
on this file since 209 was
209,
checked in by vondreele, 13 years ago
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fortran fixes - new self contained libraries
had to change all INCLUDE copyright lines.
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File size:
1.0 KB
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| 1 | SUBROUTINE LORENTZ(DT,GAM,FUNC,DLDT,DLDG) |
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| 2 | |
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| 3 | !PURPOSE:Calculate Lorentzian function & derivatives |
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| 4 | |
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| 5 | INCLUDE 'INCLDS/COPYRIGT.FOR' |
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| 6 | |
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| 7 | !PSEUDOCODE: |
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| 8 | |
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| 9 | !CALLING ARGUMENTS: |
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| 10 | |
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| 11 | REAL*4 DT !Delta |
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| 12 | REAL*4 GAM !Coefficient |
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| 13 | REAL*4 FUNC !Function |
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| 14 | REAL*4 DLDT !df/dt |
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| 15 | REAL*4 DLDG !df/dg |
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| 16 | |
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| 17 | !INCLUDE STATEMENTS: |
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| 18 | |
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| 19 | !LOCAL VARIABLES: |
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| 20 | |
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| 21 | !SUBROUTINES CALLED: |
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| 22 | |
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| 23 | !FUNCTION DEFINITIONS: |
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| 24 | |
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| 25 | !DATA STATEMENTS: |
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| 26 | |
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| 27 | DATA PI/3.1415292654/ |
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| 28 | !CODE: |
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| 29 | |
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| 30 | FNORM = 2.0*GAM/PI |
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| 31 | DENOM = GAM**2+4.0*DT**2 |
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| 32 | IF ( ABS(GAM).GT.5.0E-6 ) THEN |
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| 33 | FUNC = FNORM/DENOM |
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| 34 | DLDT = -8.0*DT*FUNC/DENOM |
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| 35 | DLDG = (8.0*DT**2-2.0*GAM**2)/(PI*DENOM**2) |
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| 36 | ELSE |
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| 37 | FUNC = 0.0 |
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| 38 | DLDT = 0.0 |
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| 39 | IF ( ABS(DT).LT.1.0E-5 ) THEN |
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| 40 | DLDG = 0.0 |
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| 41 | ELSE |
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| 42 | DLDG = 2.0/(PI*DT**2) |
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| 43 | END IF |
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| 44 | END IF |
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| 45 | RETURN |
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| 46 | END |
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