# fields, Tools for spatial data
# Copyright 2015, Institute for Mathematics Applied Geosciences
# University Corporation for Atmospheric Research
# Licensed under the GPL -- www.gpl.org/licenses/gpl.html
fields.evlpoly2 <- function(x, coef, ptab) {
    # evaluates polynomial at x values with coefficients coef[i] and powers i-1
    #
    n <- nrow(x)
    nd <- ncol(x)
    J <- nrow(ptab)
    if (length(coef) != J) {
        stop("coefficients not same length as ptab rows")
    }
    results <- rep(0, n)
    temp <- .Fortran("evlpoly2",PACKAGE="fields",
                     x = as.double(x),
                     n = as.integer(n), 
                     nd = as.integer(nd),
                     ptab = as.integer(ptab),
                     j = as.integer(J), 
                     coef = as.double(coef),
                     results = as.double(results))$results
    return(temp)
}