mtlb_legendre

Matlab legendre emulation function

Calling Sequence

P = mtlb_legendre(n,X)
P = mtlb_legendre(n,X[,normflag])

Arguments

:X a scalar, vector, matrix or hypermatrix with elements in [-1,1] :

:n a positive scalar integer :

:normflag a string (‘sch’ or ‘norm’) :

Description

Matlab and Scilab legendre behave differently in some particular cases:

• Scilab legendre(m,n,X) evaluates the legendre function of degree n and order n for the X elements. Matlab legendre(n,X) evaluates the Legendre functions of degree n and order m`=0,1,...,n. (emulated by mtlb_legendre) for the `X elements.
• The option normflag= ‘sch’ does not exist for Scilab legendre (emulated)
• If X is a hypermatrix then Scilab legendre(n,X) does not work (emulated)

The function mtlb_legendre(n,X[,normflag]) is used by mfile2sci to replace legendre(n,X[,normflag]) when it was not possible to know what were the inputs while porting Matlab code to Scilab. This function will determine the correct semantic at run time. If you want to have a more efficient code it is possible to replace mtlb_legendre call:

• If X is a scalar, a vector or a matrix mtlb_legendre(n,X[,’norm’])`may be replaced by `legendre(n,0:n,X[,’norm’])

Caution: mtlb_legendre has not to be used for hand coded functions.