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Re: Plot results not right

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89883] Re: [mg89876] Plot results not right
  • From: mante <claude.mante at univmed.fr>
  • Date: Tue, 24 Jun 2008 03:20:21 -0400 (EDT)
  • References: <200806230649.CAA00305@smc.vnet.net>

BrenB wrote:
> I'm new to Mathematica.
>
> I'm studying Calculus, and I'm trying to reproduce, in Mathematica,
> the graph results of an equation in my book.
>
> Plot[2 x - 3 x^(2/3) + 4, {x, -1, 6}]
>
> The output graph is correct, except there should be graphing in the
> 2nd and 3rd quadrant, and there is none.
>
> Is there another way to enter this equation into Mathematica to get
> the correct graph results?
>
> Thanks
>
>   
That's because  x^ r  could be complex, in general ! This is not the 
case here, but Mathematica does not automatically investigates the question.
          Just try another formulation :

Plot[2 x - 3 ( x^2)^(1/3) + 4, {x, -1, 6}]

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