Wrong Answer
- To: mathgroup at smc.vnet.net
- Subject: [mg130626] Wrong Answer
- From: christopher arthur <chris.arthur1 at gmail.com>
- Date: Fri, 26 Apr 2013 23:09:38 -0400 (EDT)
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Hello, I've discovered that Solve[] gives me the wrong answer for some polynomial equations. For example, consider the following equation, which should have exactly one positive, real answer for t. 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] NSolve gives the right answers if I substitute for px,py,vx and vy before solving. On the other hand, if I use Solve[] this way: Solve[p,t]/.r I get a different answer, and it's not correct. Does Solve[] just malfunction with quartic polynomials or is there something else happening? Chris mathematica 5.2 Solve[p]
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