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Naming pieces of patterns
*To*: mathgroup at smc.vnet.net
*Subject*: [mg29816] Naming pieces of patterns
*From*: Cyril Fischer <fischerc at itam.cas.cz>
*Date*: Thu, 12 Jul 2001 02:52:30 -0400 (EDT)
*Organization*: Inst. of Theoretical and Applied Mechanics
*Sender*: owner-wri-mathgroup at wolfram.com
How can I as simply as possible use "substitutions"
1.
-(I/(2 a)) /. I/(2 a) -> A
does not work, while
(I/(2 a)) /. I/(2 a) -> A
works well
2.
{(a + b), -(a + b)}/. a + b -> e
gives
{e, -a - b}
instead of {e,-e}
3.
{-Sqrt[a + b], 1/Sqrt[a + b]} /. Sqrt[a + b] -> e
gives
{-e,1/Sqrt[a + b]}
4.
{I, 2 I, -I} /. I -> J
gives
{J, 2 \[ImaginaryI], -\[ImaginaryI]}
I know _why_ these cases do not work, but I would like to know, if there
is a possibilty to use a common pattern rule to substitute all
occurences of an expression.
Thank you,
Cyril Fischer
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