Hi Gerrit
I did the following: access the function via
graphics:::sunflowerplot.formula, and then commented some lines to see,
where the problem lies. I guess that it is the chunk with "mf <- eval(m,
parent.frame())", but to be honest, I do not know why. My workaround is as
follows:
sunflowerplot.formula2 <- function (formula, data = NULL, xlab = NULL, ylab
= NULL, ...,
subset, na.action = NULL)
{
if (missing(formula) || (length(formula) != 3L))
stop("formula missing or incorrect")
## >> replaced all the part where "m" is defined, and write instead:
mf <- model.frame(formula, data)
require(stats, quietly = TRUE)
if (NCOL(mf) != 2L)
stop("'formula' should specify exactly two variables")
if (is.null(xlab))
xlab <- names(mf)[2L]
if (is.null(ylab))
ylab <- names(mf)[1L]
sunflowerplot(mf[[2L]], mf[[1L]], xlab = xlab, ylab = ylab,
...)
}
I know, the solution is cheap and not as sophisticated as the original
function, but it does the job (for your example).
Best,
Sina
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