Maxima: Differentiate sum at specific index-position
Subject: Maxima: Differentiate sum at specific index-position
From: Benjamin Steinvorth
Date: Wed, 1 May 2013 17:50:38 +0200
Hi All,
in Maxima 12.04.0 I have a sum
mysum : sum(u[i]^2, i, 1, N);
now I differentiate it
diff(mysum, u[i]);
now I specify a defined index i=A to differentiate it at
at(%, i=A);
Unfortunately maxima won't replace the u[i] in the sum that way.
How can I bring maxima to a result like
2*u[A]
Thanks for any help!
Regards,
Benni