I'm plotting some trip length frequencies using the following code:

plot( density(zTestData$Distance, weights=zTestData$Actual),
    xlim=c(0,10),
    main="Test TLFD",
    xlab="Distance",
   col=6  )
lines(density(zTestData$Distance, weights=zTestData$FlatWeight), col=2)
lines(density(zTestData$Distance, weights=zTestData$BrdWeight ), col=3)

which works fine except the distances are all positive, but the densities don't drop to 0 until around -2 or -3.

Is there a way for me to "force" the density plot to 0 at 0?



Thanks



Robert Farley
Metro
1 Gateway Plaza
Mail Stop 99-23-7
Los Angeles, CA 90012-2952
Voice: (213)922-2532
Fax:    (213)922-2868
www.Metro.net



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