glaguerre.quadrature.rules {gaussquad}

Create list of generalized Laguerre quadrature rules

Description

This function returns a list with n elements containing the order k quadrature rule data frame for the generalized Laguerre polynomials for orders k = 1,\;2,\; \ldots ,\;n.

Usage

glaguerre.quadrature.rules(n,alpha,normalized=FALSE)

Arguments

n

integer value for the highest order

alpha

numeric value for the polynomial parameter

normalized

boolean value. if TRUE rules are for orthonormal polynomials, otherwise they are for orthgonal polynomials

Details

An order k quadrature data frame is a named data frame that contains the roots and abscissa values of the corresponding order k orthogonal polynomial. The column with name x contains the roots or zeros and the column with name w contains the weights.

Value

A list with n elements each of which is a quadrature rule data frame

1

Quadrature rule for the order 1 generalized Laguerre polynomial

2

Quadrature rule for the order 2 generalized Laguerre polynomial

...

n

Quadrature rule for the order n generalized Laguerre polynomial

Author(s)

Frederick Novomestky [e-mail]

References

Abramowitz, M. and I. A. Stegun, 1968. Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, Dover Publications, Inc., New York.

Press, W. H., S. A. Teukolsky, W. T. Vetterling, and B. P. Flannery, 1992. Numerical Recipes in C, Cambridge University Press, Cambridge, U.K.

Stroud, A. H., and D. Secrest, 1966. Gaussian Quadrature Formulas, Prentice-Hall, Englewood Cliffs, NJ.

See Also

quadrature.rules, glaguerre.quadrature

Examples

###
### generate a list of quadrature rule data frames for
### the generalized orthogonal Laguerre polynomials
### of orders 1 to 5
### polynomial parameter is 1.0
###
orthogonal.rules <- glaguerre.quadrature.rules( 5, 1 )
print( orthogonal.rules )
###
### generate a list of quadrature rule data frames for
### the generalized orthonormal Laguerre polynomials
### of orders 1 to 5
### polynomial parameter is 1.0
###
orthonormal.rules <- glaguerre.quadrature.rules( 5, 1, TRUE )
print( orthonormal.rules )