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MathGroup Archive 2007

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Kernel Crashing with NDSolve Command

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73664] Kernel Crashing with NDSolve Command
  • From: pradeep <pradeep at purdue.edu>
  • Date: Sat, 24 Feb 2007 02:14:27 -0500 (EST)
  • Organization: Purdue University

Hi all
i have this rather innocuous looking NDSolve command thats crashing the 
mathematica kernel,
NDSolve[{y'[x]==Min[s[x]+Sin[x],Cos[x]-s[x]],y[0]==0,s[x]==x^2},{y,s},{x,0,3}]

If i were to substitute s[x] in this equation with x^2 and then try 
solving, i get an answer, if i assign s[x] in advance and try solving 
it, i still get an answer but the nature of the algorithm followed by 
NDSolve doesnt allow it to take s[x] as a dependent variable and still 
have it occur inside the Min function! i find that weird!
Someone have an explanation??
thanks in advance!
Pradeep
p.s. also note the that the nature of my application is such that i'd 
like to solve this bunch of equations in a single shot without 
assignment statements hence i dont have use for the two approaches that 
i mentioned worked.


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