R/createIntegrationGrid.R

In SparseGrid: Sparse grid integration in R

# Copyright (C) 2011 Jelmer Ypma. All Rights Reserved.
# This code is published under the GPL.
#
# File:   createIntegrationGrid.R
# Author: Jelmer Ypma
# Date:   17 May 2011
#
# Input: 
# Output: 
#
# 14/05/2011: Removed check on argument 'type', because checking is done in createSparseGrid and createProductRuleGrid.

# return grid with the least number of nodes, either sparse grid or product rule grid
createIntegrationGrid <- function( type, dimension, k, sym = FALSE ) {
    
    integration.grid <- createSparseGrid( 
                                type=type, 
                                dimension=dimension, 
                                k=k )
    if ( length( integration.grid$weights ) > k^dimension ) {
        integration.grid <- createProductRuleGrid( type=type, dimension=dimension, k=k )
    }
    
    return( integration.grid )
}