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Re: Wrong Answer

  • To: mathgroup at smc.vnet.net
  • Subject: [mg130635] Re: Wrong Answer
  • From: Clif McInnis <c_mcinnis at hotmail.com>
  • Date: Sun, 28 Apr 2013 00:58:39 -0400 (EDT)
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Not sure if this will be helpful but here is what I get with ver. 9.0.1

In[17]:= p := (px + t vx)^4 + (py + t vy)^4 == 1
r := {px -> 0.5, py -> 0.5, vx -> 0.5, vy -> 0.5}
NSolve[p /. r, t]
Solve[p, t] /. r
Solve[p]


Out[19]= {{t -> -2.68179}, {t -> -1. - 1.68179 I}, {t -> -1. + 
    1.68179 I}, {t -> 0.681793}}

During evaluation of In[17]:= Power::infy: Infinite expression 1/Sqrt[0.] encountered. >>

During evaluation of In[17]:= Infinity::indet: Indeterminate expression 0. ComplexInfinity encountered. >>

During evaluation of In[17]:= Power::infy: Infinite expression 1/Sqrt[0.] encountered. >>

During evaluation of In[17]:= Infinity::indet: Indeterminate expression 0. ComplexInfinity encountered. >>

During evaluation of In[17]:= Power::infy: Infinite expression 1/Sqrt[0.] encountered. >>

During evaluation of In[17]:= General::stop: Further output of Power::infy will be suppressed during this calculation. >>

During evaluation of In[17]:= Infinity::indet: Indeterminate expression 0. ComplexInfinity encountered. >>

During evaluation of In[17]:= General::stop: Further output of Infinity::indet will be suppressed during this calculation. >>

Out[20]= {{t -> Indeterminate}, {t -> Indeterminate}, {t -> 
   Indeterminate}, {t -> Indeterminate}}

Out[21]= {{px -> -t vx - (1 - py^4 - 4 py^3 t vy - 6 py^2 t^2 vy^2 - 
      4 py t^3 vy^3 - t^4 vy^4)^(1/4)}, {px -> -t vx - 
    I (1 - py^4 - 4 py^3 t vy - 6 py^2 t^2 vy^2 - 4 py t^3 vy^3 - 
       t^4 vy^4)^(1/4)}, {px -> -t vx + 
    I (1 - py^4 - 4 py^3 t vy - 6 py^2 t^2 vy^2 - 4 py t^3 vy^3 - 
       t^4 vy^4)^(
     1/4)}, {px -> -t vx + (1 - py^4 - 4 py^3 t vy - 
      6 py^2 t^2 vy^2 - 4 py t^3 vy^3 - t^4 vy^4)^(1/4)}}



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