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Gain a Major 50% in int integral

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Thomas Applencourt 2015-05-05 19:58:33 +02:00
parent 17155b5ec1
commit bd95f3f86e
1 changed files with 11 additions and 10 deletions
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21
src/Pseudo_integrals/int.f90
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@ -1905,7 +1905,8 @@ double precision function int_prod_bessel(l,gam,n,m,a,b,arg)
double precision int,intold,sum,coef_nk,crochet,u,int_prod_bessel_large,freal,arg
double precision dump
double precision, allocatable :: temp_array(:)
double precision, allocatable :: temp_array_a(:)
double precision, allocatable :: temp_array_b(:)
logical done
@ -1935,22 +1936,21 @@ double precision function int_prod_bessel(l,gam,n,m,a,b,arg)
done=.false.
kcp=0
allocate( temp_array(0:101))
allocate( temp_array_a(0:100))
allocate( temp_array_b(0+m:200+m))
do while (.not.done)
kcp=kcp+1
sum=0.d0
dump = a**n
do k=q,q+1
temp_array(k) = coef_nk(n,k)*dump*(a**(2*k))
enddo
temp_array_a(q) = coef_nk(n,q)*(a**(n+2*q))
temp_array_b(m+2*q) = coef_nk(m,q)*b**(m+2*q)
do k=0,q
sum=sum+temp_array(k)*coef_nk(m,q-k)*b**(m-2*k+2*q)
sum=sum+temp_array_a(k)*temp_array_b(m-2*k+2*q)
enddo
int=int+sum*crochet(2*q+n+m+l,gam)
if(dabs(int-intold).lt.1d-15)then
@ -1963,14 +1963,15 @@ double precision function int_prod_bessel(l,gam,n,m,a,b,arg)
enddo
deallocate(temp_array)
deallocate(temp_array_a)
deallocate(temp_array_b)
int_prod_bessel=int*freal
if(kcp.gt.100)then
print*,'**WARNING** bad convergence in int_prod_bessel'
endif
return
endif