| Author |
Comment/Response |
J H Ettle
|
 07/02/03 05:08am
I've been trying to take a derivative of a (general) summation (like the kind found in the attached notebook) with a symbolic upper limit. The derivative is with respect to a parameter that is passed to a function F inside the sum. I then multiply the summand by a function L of the index to get:
Sum[L[i] F[s], {i, 1, M}].
I then take the derivative of the above with respect to s. Mathematica passes the derivative into the sum, a-la
Sum[D[L[i] F[s], s], {i, 1, M}],
but doesn't carry the derivation on through. I have to manually extract the summand and evaluate it to get
L[i] F'[s],
as expected. Why is this? And how come Mathematica DOES carry the differentiation through when I try the same with an analogous integral?
Attachment: DerivativeAnomaly.nb, URL: , |
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