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I need to make a graphic to show problems on different parts of chromosomes (think of a graphic showing the number of frayed threads as colors along different parts of a worn out rope). I want to draw bars going from left to right across a page and color different parts of the bars in different shades. Each graphic will need to have several bars of different lenghts corresponding to the

Is there a list of object types used by R? Is there a function that I can use to tell the type of an object? Thanks a bunch, Ray [[alternative HTML version deleted]]

I have the code below and it works fine if I print the xyplot but if I take the print out, then I just get a blank pdf. The same holds if I just send the plot to the console without the print ( I get nothing ). My question is whether this is always the case with xyplot or is there something wrong with my settings ? I am on linux ( redhat ) and using R.2.5.0. Thanks. load("stocks.dat")

What is the name of the function to give me the mode (central tendancy) of a numeric variable that can be negative? [[alternative HTML version deleted]]