[Rd] x-axis label in persp() (PR#1161)

[rolf@maths.uwa.edu.au]

If the surface to be plotted by persp() is supplied as
a list, the x-axis label defaults to the name, in the call,
of this list --- which is usually silly.

I would suggest changing the first four lines of
persp.default() (where the x-axis label gets set) from

if (is.null(xlab))
        xlab <- if (!missing(x))
            deparse(substitute(x))
        else "X"

to

if (is.null(xlab))
        xlab <- if (!missing(x) && !is.list(x) && !is.matrix(x))
            deparse(substitute(x))
        else "X"

which makes the x-axis label default to "X" if the surface
is specified as a list.


					cheers,

						Rolf Turner

Current email address: rolf@maths.uwa.edu.au
Usual email address:   rolf@math.unb.ca

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