R-alpha: R 0.50.a1: patch for NChisquare documentation

[Kurt Hornik]

The patch below fixes the NChisquare documentation problem that I've
been mentioning for some time now.

NOTE:  There is one DEQN where the LaTeX part contains real LaTeX code,
because I did not see how to get a sum sign (and a roman math font)
otherwise.  Seems to work, though ... MARTIN?

-k

**********************************************************************
*** src/library/base/man/NChisquare.orig	Sat Jul 26 10:50:54 1997
--- src/library/base/man/NChisquare	Sat Jul 26 11:26:23 1997
***************
*** 1,26 ****
  TITLE(NChisquare @@ The Non-Central Chi-Square Distribution)
  USAGE(
! dnchisq(x, df)
! pnchisq(x, df)
! qnchisq(x, df)
! rnchisq(x, df)
  )
  ALIAS(dnchisq)
  ALIAS(pnchisq)
  ALIAS(qnchisq)
  ALIAS(rnchisq)
  DESCRIPTION(
! These functions provide information about the non-central
! chi-square distribution with LANG(df) degrees of freedom.
! LANG(dnchisq) gives the density, LANG(pnchisq) gives the
! distribution function LANG(qnchisq) gives the quantile
  function and LANG(rnchisq) generates random deviates.
  PARA
! The non-central chi-square distribution with EQN(n)
! degrees-of-freedom has density
! DEQN(f(x) =
! OVER(1 @@ SUP(2@@n/2) greekGamma (n/2))
! SUP(x@@n/2-1) SUP(e@@-x/2)
! @@f(x) = 1 / (2^(n/2) Gamma(n/2))  x^(n/2-1) e^-x/2)
  for EQN(x GE 0).
  )
--- 1,28 ----
  TITLE(NChisquare @@ The Non-Central Chi-Square Distribution)
  USAGE(
! dnchisq(x, df, lambda)
! pnchisq(x, df, lambda)
! qnchisq(x, df, lambda)
! rnchisq(x, df, lambda)
  )
  ALIAS(dnchisq)
  ALIAS(pnchisq)
  ALIAS(qnchisq)
  ALIAS(rnchisq)
  DESCRIPTION(
! These functions provide information about the non-central chi-square
! distribution with LANG(df) degrees of freedom and non-centrality
! parameter LANG(lambda).  LANG(dnchisq) gives the density, LANG(pnchisq)
! gives the distribution function LANG(qnchisq) gives the quantile
  function and LANG(rnchisq) generates random deviates.
  PARA
! The non-central chi-square distribution with EQN(df) degrees of freedom
! and non-centrality parameter EQN(greeklambda) has density
! DEQN(f(x) = SUP(e @@ -\lambda / 2)
!   \sum_{r=0}^\infty \frac{\lambda^r}{2^r r!} \mathrm{pchisq}(x, df + 2r) 
!   @@
!   f(x) = exp(-lambda/2) SUM_{r=0}^infty (lambda^r / 2^r r!)
!   pchisq(x, df + 2r)
! )
  for EQN(x GE 0).
  )
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