dxpqnu.f
SUBROUTINE DXPQNU (NU1, NU2, MU, THETA, ID, PQA, IPQA, IERROR)
C***BEGIN PROLOGUE DXPQNU
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Warning: this routine is not intended to be user-callable.
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C***SUBSIDIARY
C***PURPOSE To compute the values of Legendre functions for DXLEGF.
C This subroutine calculates initial values of P or Q using
C power series, then performs forward nu-wise recurrence to
C obtain P(-MU,NU,X), Q(0,NU,X), or Q(1,NU,X). The nu-wise
C recurrence is stable for P for all mu and for Q for mu=0,1.
C***LIBRARY SLATEC
C***CATEGORY C3A2, C9
C***TYPE DOUBLE PRECISION (XPQNU-S, DXPQNU-D)
C***KEYWORDS LEGENDRE FUNCTIONS
C***AUTHOR Smith, John M., (NBS and George Mason University)
C***ROUTINES CALLED DXADD, DXADJ, DXPSI
C***COMMON BLOCKS DXBLK1
C***REVISION HISTORY (YYMMDD)
C 820728 DATE WRITTEN
C 890126 Revised to meet SLATEC CML recommendations. (DWL and JMS)
C 901019 Revisions to prologue. (DWL and WRB)
C 901106 Changed all specific intrinsics to generic. (WRB)
C Corrected order of sections in prologue and added TYPE
C section. (WRB)
C 920127 Revised PURPOSE section of prologue. (DWL)
C***END PROLOGUE DXPQNU