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*To*: mathgroup at smc.vnet.net*Subject*: [mg2205] Reply to [mg2170]*From*: hwalker at UH.EDU (Hugh Walker)*Date*: Mon, 16 Oct 1995 11:52:54 -0400

In [mg2170] txp at pi.net (JanHolland) writes: <Say GTK = ATC = Average Total Cost := 1/3 q^2 - 10 q + 100 When I give Plot[GTK,{q,0,30}] the resulting graph gives a minimum below to X-axis at aboutq=15 When I give q=15 and N[GTK] it evaluates correctly to GTK=25. What am I doing wrong ?> ====================================== Try Plot[gtk,{q,0,30},PlotRange->{0,100}]; Mathematica, for its own reasons, wants to plot the graph with axes chosen differently than seems natural to you. Hugh Walker Physics Univ of Houston