D under Sum
- To: mathgroup at smc.vnet.net
- Subject: [mg128382] D under Sum
- From: Nicolas Venuti <nicolas at virtualdynamics.fr>
- Date: Thu, 11 Oct 2012 02:09:47 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- Delivered-to: l-mathgroup@wolfram.com
- Delivered-to: mathgroup-newout@smc.vnet.net
- Delivered-to: mathgroup-newsend@smc.vnet.net
Hello
I want the derivation D to be applied under the Sum sign,
I have a function HoldSum that do not evaluate but is similar to Sum in form
In[3]:= D[HoldSum[p*i, {i, 1, n}], p]
I get the output :
Out[3]=i*HoldSum^(1, {0, 0, 0})[i p, {i, 1, n}]
but I would want that D be applied under the Sum sign like done by hand here :
In[5]:= HoldSum[D[p i, i], {i, 1, n}]
Out[5]= HoldSum[p, {i, 1, n}]
Obviously I want D to work for any expression containing HoldSum (even on nested HoldSum expression)
Does anybody knows how to do that ?
Best regards
Nicolas
- Follow-Ups:
- Re: D under Sum
- From: Bob Hanlon <hanlonr357@gmail.com>
- Re: D under Sum