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Solving ODE in Mathematica

Posted 10 years ago

I am a student pursuing an engineering degree and am taking an introductory course on nuclear engineering. One of our "computational exercises" is enter image description here

I don't understand the output I'm getting. I used y and x instead of N and t since I had read somewhere that N shouldn't be used. The output I'm looking for is e^-lambda(t) or in this case e^-lamda x. Can someone help me figure out where I'm going wrong?

Thanks

POSTED BY: Jen Watkins
2 Replies
Posted 10 years ago

Thank you!

POSTED BY: Jen Watkins

You defined $\lambda y $ as one symbol, not as $\lambda \cdot y$:

DSolve[y'[x] == - lambda y[x], y[x], x]
DSolve[y'[x] == - lambday[x], y[x], x]

I.M.

POSTED BY: Ivan Morozov
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