[R] lattice : superpose symbols with a great many points

[Laurent Rhelp]

Hi,

   I like to use with xyplot (package lattice) the groups argument and 
superpose.symbol to compare several curves. But, when there are a great 
many points, the symbols are very close and the graph becomes 
unreadable. Would there be an argument  or a tip not to draw all the 
symbols, for example the symbols could be drawn only every x points, x 
given as an argument ?

Thanks
Best regards
Laurent



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