Nothing
magcurve=function (expr, from = NULL, to = NULL, n = 101, add = FALSE,
type = "l", xname = "x", xlab = xname, ylab = NULL, log = NULL,
xlim = NULL, ...)
{
sexpr <- substitute(expr)
if (is.name(sexpr)) {
expr <- call(as.character(sexpr), as.name(xname))
}
else {
if (!((is.call(sexpr) || is.expression(sexpr)) && xname %in%
all.vars(sexpr)))
stop(gettextf("'expr' must be a function, or a call or an expression containing '%s'",
xname), domain = NA)
expr <- sexpr
}
if (dev.cur() == 1L && !isFALSE(add)) {
warning("'add' will be ignored as there is no existing plot")
add <- FALSE
}
addF <- isFALSE(add)
if (is.null(ylab))
ylab <- deparse(expr)
if (is.null(from) || is.null(to)) {
xl <- if (!is.null(xlim))
xlim
else if (!addF) {
pu <- par("usr")[1L:2L]
if (par("xaxs") == "r")
pu <- extendrange(pu, f = -1/27)
if (par("xlog"))
10^pu
else pu
}
else c(0, 1)
if (is.null(from))
from <- xl[1L]
if (is.null(to))
to <- xl[2L]
}
lg <- if (length(log))
log
else if (!addF && par("xlog"))
"x"
else ""
if (length(lg) == 0)
lg <- ""
if (grepl("x", lg, fixed = TRUE)) {
if (from <= 0 || to <= 0)
stop("'from' and 'to' must be > 0 with log=\"x\"")
x <- exp(seq.int(log(from), log(to), length.out = n))
}
else x <- seq.int(from, to, length.out = n)
ll <- list(x = x)
names(ll) <- xname
y <- eval(expr, envir = ll, enclos = parent.frame())
if (length(y) != length(x))
stop("'expr' did not evaluate to an object of length 'n'")
if (isTRUE(add))
lines(x = x, y = y, type = type, ...)
else magplot(x = x, y = y, type = type, xlab = xlab, ylab = ylab,
xlim = xlim, log = lg, ...)
invisible(list(x = x, y = y))
}
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