R_Learner wrote:
You guys are completely right...my lines were off the graph. I was also using
points() in addition to lines, so it seems like it needs a pre-specified
range unlike plot().
Yes. Or more precisely: plot() is not prescient, it will scale to contain its own points/lines, but not any future additions. This is also known as the ink-on-paper model. (This is true for large parts of R graphics; the grid and lattice packages do things somewhat differently.)

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  O__  ---- Peter Dalgaard             Ă˜ster Farimagsgade 5, Entr.B
 c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen   Denmark      Ph:  (+45) 35327918
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