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Newbie Plot-Fit Questions.
*To*: mathgroup at smc.vnet.net
*Subject*: [mg31116] Newbie Plot-Fit Questions.
*From*: realbeaux at yahoo.com (SkyBeaux)
*Date*: Wed, 10 Oct 2001 19:14:35 -0400 (EDT)
*Sender*: owner-wri-mathgroup at wolfram.com
Please explain this to me:
If I do the following:
Fit[{{2942, 3650782}, {2955, 2255796}, {3204, 730421}, {4105,
1740135}, {7815,
6329111}, {13097, 7116844}}, {1, x, x^2, x^3}, x]
Results are:
\!\(1.7044496230729986`*^7 - 8507.38287339198`\ x +
1.3901134594316935`\ x\^2 - 0.00006096360495406324`\ x\^3\)
Then I plot the results as follows:
\!\(Plot[1.7044496230729986`*^7 - 8507.38287339198`\ x +
1.3901134594316935`\ x\^2 - 0.00006096360495406324`\ x\^3, {x,
2942,
13097}]\)
I get a nice "sin" looking plot. (This is what I want.)
However if I try to combine the two statements into one. Like this:
Plot[(Fit[{{2942, 3650782}, {2955, 2255796}, {3204, 730421}, {4105,
1740135}, {7815, 6329111}, {13097, 7116844}}, {1, x, x^2,
x^3},
x]), {x, 2942, 13097}]
I get a linear chart.
What is the difference? And how do I get my nice "sin" looking plot
back?
As you can see, I an not really sure what is being plotted by the
first set of commands, but I think it is a log plot.
Thanks for you help.
--SB
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