# fields, Tools for spatial data
# Copyright 2004-2007, Institute for Mathematics Applied Geosciences
# University Corporation for Atmospheric Research
# Licensed under the GPL -- www.gpl.org/licenses/gpl.html
dyadic.2check <- function(m, n, cut.p = 2) {
    # checks that n is of the form
    # n=p*2^m where p <= cut.p
    m2 <- as.integer(m)
    n2 <- as.integer(n)
    while ((n2 > cut.p) & (m2 > cut.p)) {
        if ((m2%%2 != 0) | (n2%%2 != 0)) {
            cat(n, "and", m, "must equal p*2^L where p is less than or equal to ", 
                cut.p, fill = TRUE)
            return(FALSE)
        }
        m2 <- m2/2
        n2 <- n2/2
    }
    return(TRUE)
}