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Topic: question about ndsolve
Replies: 2   Last Post: Sep 17, 2013 9:30 PM

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Hagwood, Charles R.

Posts: 12
Registered: 12/31/09
question about ndsolve
Posted: Sep 10, 2013 3:24 AM
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I know the following differential equation has a solution, but cannot get NDSolve to find it.



sol=NDSolve[{-6*y'[x]^2*(q1[x,.3].q2'[y[x]]) +6*y'[x]^(5/2)*h1[y[x]]+y''[x]*(q1[x,.3].q2[y[x]])-y''[x]*y'[x]^(1/2)*h2[y[x]]==0,y[0]==0,y[1]==1},y,{x,0.01,1},Method->{"Shooting","StartingInitialConditions"->{y[0]==0}}]

I get the error NDSolve::ntcs: Cannot solve constraint equations for initial conditions. <http://reference.wolfram.com/mathematica/ref/message/NDSolve/ntcs.html>

The solution is


The following expression is zero for all values of x

-6*y'[x]^2*(q1[x,.3].q2'[y[x]]) +6*y'[x]^(5/2)*h1[y[x]]+y''[x]*(q1[x,.3].q2[y[x]])-y''[x]*y'[x]^(1/2)*h2[y[x]]/.x->.9

Does anyone know what is going wrong with NDSolve?

Charles Hagwood

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