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MathGroup Archive 1998

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What is this doing...?...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14775] What is this doing...?...
  • From: Mitch Padua <vpadua at csufresno.edu>
  • Date: Sat, 14 Nov 1998 03:08:05 -0500
  • Organization: California State University, Fresno
  • Sender: owner-wri-mathgroup at wolfram.com

I've having some trouble interpreting a graph I receive in mathematica,
maybe someone can help?  Here's what I have:

Normal[Series[Sin[x], {x,0,#}]]& /@ {1,3,5,7}
f[#]& /@ {arg1, arg2, arg3}
Join[{a,b,c}, {d,e}]
plotts[fx_, a0_: 0, {x_,a_,b_}, k_List, opt___]
:=Plot[Evaluate[Join[Normal[Series[fx,{x,a0,#}]]& /@ k, {fx}]], {x,a,b},

opt]

now I type the command to graph:

plotts[Log[x+1], {x, -.99,2}, {1,3,25}, PlotRange->{-5,2}]

and all is well however when I change the 25 to 30 I get a different
graph, why?  What is going on here?  I believe this is a Taylor series
or something, but can someone explain to me when I change the
plotts[Log[x+1], {x, -.99,2}, {1,3,25}, PlotRange->{-5,2}] to
plotts[Log[x+1], {x, -.99,2}, {1,3,30}, PlotRange->{-5,2}] I get a
different graph?  I must admit I've only used mathematica for about 15
minutes...so an explanation as to why this graph is changing would
really help.

Thanks,


--
____/|  Vincent M. Padua  (vincent at psnw.com) \ o.O|
 =(_)=  "Thou shalt not follow the NULL pointer for
   U     chaos and madness await thee at its end."




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