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i try to use par(new=TRUE) i get them at the same graph but the y_axis and x_axis are drowen with two unevenly graduations that graph become unreadable. -- View this message in context: http://www.nabble.com/two-curves-at-one-graph-tp17307590p17307590.html Sent from the R help mailing list archive at Nabble.com.

Hi, all I have a medium sized data, 6 years. Each observation is a case with a date variable, such as '2004-08-02'. Some of the months didn't occur a case. I want to plot the 6 years data by month, and the Y_axis is the freqency of cases for each month, meaning 12*6=72 bars or points in the figure. I though of a method, 1st, using the months function, then ploting. But I need to assign zero to the months without case. And a lot of other manipulations. Is there any simpler way to complete this? or just a sim...