##' Convert polar to cartesian coordinates
##'
##'
##' @param r Distance
##' @param theta Angle (default radians)
##' @param deg If specified, then theta is in degrees
##' @param recycle If specified, recycles \code{r}
##' @return Matrix of x,y coordinates
##' @export
pol2cart <- function(r, theta, deg = FALSE, recycle = FALSE) {
if (deg) theta <- theta * pi/180
if (length(r) > 1 && length(r) != length(theta) && !recycle)
stop("'r' vector different length than theta, if recycling 'r' values is desired 'recycle' must be TRUE")
xx <- r * cos(theta)
yy <- r * sin(theta)
## Account for machine error in trig functions
xx[abs(xx) < 2e-15] <- 0
yy[abs(yy) < 2e-15] <- 0
out <- cbind(xx, yy)
colnames(out) <- c("x", "y")
return( out )
}
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