MathGroup Archive 2007

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I'm confused about the "interpolation" thing. Why if I have some diff eq with boundary conditions NdSolve doesn't give me a numerical solution? And suppose I have 

y'[x]== f[x] 
with y[a]== b as a condition (a,b any numbers) 

How can I find f[0], for example? (Generalizing, how can I find f[c], where c is a number?)

Thanks to everyone! And please, help me :(

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