[R] pb with Date format using filled.contour

[Xavier Bodin]

Hi R-help community,

Can anyone tell me why, while using :
    x <- seq(as.Date("2001-01-01"),as.Date("2001-01-01") +
nrow(volcano)-1,1)
    y <- seq(1, ncol(volcano),1)

when I plot the volcano matrix with that command :
    filled.contour(x,y,volcano)
the graph has a Date format on X-axis, ok ...

... but when adding a contour plot to the filled contour, using this
command:
    filled.contour(x,y,volcano,
plot.axes={axis(1);axis(2);contour(x,y,volcano, add = TRUE)})
the Date format doesn't appear anymore ... ??

Thanks in advance for any help,

Xavier

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