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Author Comment/Response
yehuda
02/23/13 6:45pm

It seems that in one of your previous trials you set a value to y'[0] which was different than 1/3 and since it has a value Mathematica is able to evaluate y'[0]==1/3 and conclude it is wrong

Here is an example.
DSolve[{y''[x] + 2 y'[x] + y[x] == Sin[x], y'[0] == 0, y[0] == 1},
y[x], x]

returning
{{y[x] -> -(1/2) E^-x (-3 - 3 x + E^x Cos[x])}}

now
y'[0] = 5

and try again the previous call to NDSolve

DSolve[{y''[x] + 2 y'[x] + y[x] == Sin[x], y'[0] == 0, y[0] == 1},
y[x], x]

returning

DSolve[{y[x] + 2 Derivative[1][y][x] + (y^\[Prime]\[Prime])[x] ==
Sin[x], False, y[0] == 1}, y[x], x]


yehuda


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Subject (listing for 'DSolve Problem')
Author Date Posted
DSolve Problem Pul Horth 02/22/13 2:09pm
Re: DSolve Problem yehuda 02/23/13 6:45pm
Re: Re: DSolve Problem Paul Horth 02/25/13 12:51pm
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