LCOV - code coverage report
Current view: top level - math - cylbes.f (source / functions) Hit Total Coverage
Test: combined.info Lines: 0 24 0.0 %
Date: 2019-09-08 04:53:50 Functions: 0 1 0.0 %

          Line data    Source code
       1             : !--------------------------------------------------------------------------------
       2             : ! Copyright (c) 2016 Peter Grünberg Institut, Forschungszentrum Jülich, Germany
       3             : ! This file is part of FLEUR and available as free software under the conditions
       4             : ! of the MIT license as expressed in the LICENSE file in more detail.
       5             : !--------------------------------------------------------------------------------
       6             : 
       7             :       MODULE m_cylbes     
       8             :       use m_juDFT
       9             : c********************************************************************
      10             : c generates cylindrical Bessel functions for a given x and for the orders 
      11             : c from mmax to -mmax
      12             : c                                  Y. Mokrousov
      13             : c********************************************************************
      14             :       CONTAINS
      15           0 :       SUBROUTINE cylbes(
      16             :      >                  mmax,x,
      17           0 :      <                  fJ) 
      18             : 
      19             :       IMPLICIT NONE
      20             : !     ..
      21             : !     ..Arguments ..
      22             :       INTEGER, INTENT  (IN) :: mmax
      23             :       REAL,    INTENT  (IN) :: x
      24             :       REAL,    INTENT (OUT) :: fJ(-mmax:mmax)
      25             : !
      26             : !     .. Parameters ..
      27             :       REAL,    PARAMETER :: zero = 0.0
      28             : !     ..Locals ..
      29             :       INTEGER :: m,i,mass
      30             :       REAL :: quot
      31           0 :       REAL, ALLOCATABLE :: aux(:)
      32             : !     ..
      33             : 
      34           0 :       IF (x.LT.zero)  CALL juDFT_error("cylbes2",calledby="cylbes")
      35             : 
      36           0 :       IF (x.EQ.zero) THEN
      37           0 :         fJ(0) = 1.
      38             : 
      39           0 :         DO m=1,mmax
      40           0 :          fJ(m) = 0.
      41           0 :          fJ(-m) = 0.
      42             :         END DO
      43             :         RETURN
      44             :       END IF 
      45             : 
      46           0 :       mass = INT( mmax + 50 + x )
      47           0 :       ALLOCATE ( aux(0:mass) )       
      48           0 :       aux(mass) = 0.0
      49           0 :       aux(mass-1) = 1.0e-22   
      50             :      
      51           0 :       DO i=mass-2,0,-1
      52           0 :         aux(i) = 2*(i+1)*aux(i+1)/x - aux(i+2)
      53             :       END DO
      54             : 
      55           0 :       quot = aux(0)
      56             : 
      57           0 :       DO i=1,INT( mass/2. )
      58           0 :         quot = quot + 2*aux(2*i)
      59             :       END DO  
      60             : 
      61           0 :       fJ(0) = aux(0)/quot
      62             : 
      63           0 :       DO m=1,mmax
      64           0 :         fJ(m) = aux(m)/quot
      65           0 :         fJ(-m) = ((-1)**m)*fJ(m)
      66             :       END DO
      67             : 
      68           0 :       DEALLOCATE ( aux )
      69             : 
      70           0 :       RETURN
      71             :       END SUBROUTINE cylbes
      72             :       END MODULE m_cylbes 
      73             :  
      74             : 
      75             : 
      76             : 
      77             : 
      78             : 

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