[R] pb with Date format using filled.contour

From: Xavier Bodin <xavier.bodin_at_univ-savoie.fr>
Date: Wed, 02 Mar 2011 01:19:16 -0800 (PST)

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 :

the graph has a Date format on X-axis, ok ...

... but when adding a contour plot to the filled contour, using this command:

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,


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