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[Help-gsl] sign in gsl_sf_legendre_Plm / gsl_sf_legendre_sphPlm
From: |
Denis Davydov |
Subject: |
[Help-gsl] sign in gsl_sf_legendre_Plm / gsl_sf_legendre_sphPlm |
Date: |
Wed, 29 Oct 2014 19:33:05 +0100 |
Dear all,
I am trying to use the associated Legendre polynomials,
but I am confused about the sign.
I would expect P_1^1(cos(phi)) = sin(phi) > 0 and
therefore to have the normalised polynomial also positive.
However, it seems that there is a (-1)^m multiplier
compared to the expression I see in several books.
Could someone please clarify this issue for me?
Kind regards,
Denis
- [Help-gsl] sign in gsl_sf_legendre_Plm / gsl_sf_legendre_sphPlm,
Denis Davydov <=