Re: Replace in operators
- To: mathgroup at smc.vnet.net
- Subject: [mg103004] Re: Replace in operators
- From: did <didier.oslo at hotmail.com>
- Date: Thu, 3 Sep 2009 19:55:19 -0400 (EDT)
- References: <h7ijns$i5a$1@smc.vnet.net>
Thanks you all for your replies. Some solutions proposed do not apply for my problem because they are too ad hoc to the simplified example I proposed. What I have to treat is more something like BigBlackBox //. LongListOfSubstitutions where BigBlackBox includes (so far) differential operators with derivatives of up to the fifth order over 8 independant variables. It's quite impossible to extract by hand all the operators and use the ad hoc substitution for each of them. The two work-around proposed: ReleaseHold[Hold[BigBlackBox] /. LongListOfSubstitutions] and Unevaluated[BigBlackBox] /. LongListOfSubstitutions would have been great if they worked. Unfortunately they don't for reasons I don't understand. On a reduced problem, I managed to create tables including all the derivatives I needed. This made use tables that crashed my computer (I've only 4GB of RAM). Does someone has any other suggestion ? Thanks again for your help