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piscal/dataassim/math/numrec/f77_sources/hypdrv.for
T
2016-02-03 18:52:05 +00:00

10 lines
264 B
Fortran

SUBROUTINE hypdrv(s,y,dyds)
REAL s
COMPLEX y(2),dyds(2),aa,bb,cc,z0,dz,z
COMMON /hypg/ aa,bb,cc,z0,dz
z=z0+s*dz
dyds(1)=y(2)*dz
dyds(2)=((aa*bb)*y(1)-(cc-((aa+bb)+1.)*z)*y(2))*dz/(z*(1.-z))
return
END