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Student Support Forum: 'DSolve::bvfail' topicStudent Support Forum > General > Archives > "DSolve::bvfail"

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cipocip
01/20/12 04:43am

I am trying to do this for parameter i0 in Mathematica 7:

DSolve[{y'[x] + 0.9 y[x] == -0.5 y[x]^2, y[0] == i0}, y[x], x]

but get

DSolve::bvnul: For some branches of the general solution, the given boundary conditions lead to an empty solution

In Mathematica 5 this used to work, the answer being :

45(i0/(9+5 i0))/(-5 e^(0.9 t)+25(i0/(9+5 i0)))

Is there a workaround in Mathematica 7 ?

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Subject (listing for 'DSolve::bvfail')
Author Date Posted
DSolve::bvfail cipocip 01/20/12 04:43am
Re: DSolve::bvfail jf 01/20/12 09:34am
Re: DSolve::bvfail Forum Modera... 01/20/12 09:47am
Re: DSolve::bvfail--it worked cipocip 01/20/12 10:47am
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