
Is there any way to use more than one color or shape in the same plot.  I would like to make the points different colors for various levels of a variable.  I have tried a simple 'if' statement in the plot command, but I get an error message.  Here is what I have tried and the error message I get: > plot(test, if(test[,1]<8) col="steelblue2" else col="wheat2")Error in xy.coords(x, y, xlabel, ylabel, log) :   'x' and 'y' lengths differIn addition: Warning message:In if (test[, 1] < 8) col = "steelblue2" else col = "wheat2" :  the condition has length > 1 and only the first element will be usedI know 'x' and 'y' lenghths do NOT differ.  If I just do plot(test), it works perfectly.  Is there any way to this?Thanks,Donna
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