MaplePrimes - answers and comments on Question, replacement for OP command

selectremove

Preben Alsholm — Tue, 19 Mar 2013 21:18:27 Z

Would this do it:

S,R:=selectremove(has,eq2,phi[i](y)*diff(w(y),y));
Parts(S,phi[i](y));
eq3:=R+%;

subsindets and collect

Carl Love — Tue, 19 Mar 2013 21:19:15 Z

The command that you want is subsindets (or possibly evalindets). Here's an appropriate analogy: subsindets is to indets as applyop is to op.

I think you should collect like terms with respect to the integrals, like this

collect(eq2, Int);

so that each specific integrand only occurs once.

Tell me exactly which integrands you are trying to select. You said "like" phi[i](y)*diff(w(y), y). Do you mean exactly that integrand? Or would phi[i](y)*diff(w(y), y)^2 also count as "like"?

Once you answer that, I can give you a type specification that you can use with subsindets.

Thanks for responding!!

sakhan — Tue, 19 Mar 2013 22:03:53 Z

Thankyou very much for your time!!

Yes this solves my problem and it is more general than my previous solution

But for larger number of integrable integrals in equation, its is really tedious to type each different form of integrand.

Yes but it would be really great if the command could handle other problems

sakhan — Tue, 19 Mar 2013 21:55:33 Z

Thanks for responding!

No. I dont need the term you mentioned.

In general I only need terms which are linear power( caution not degree)

For example I do like integration of terms like like:

1. phi[i](y)*diff(w(y), y)

2.phi[i](y)*diff(w(y), y$2)

In general I need terms like

3. diff( phi[i](y), y$m) *diff(w(y), y$ k) ; where m < k ( but this is not required in this problem, In this specific problem I require integration for terms like term 1 and term2

integration of terms like

phi[i](y)*diff(w(y), y)^2

phi[i](y)*diff(w(y), y)^k

diff( phi[i](y), y$2)*diff(w(y), y$n)^k

should be avioded