Re: Modifying arguments of sub-parts of an expression
- To: mathgroup at smc.vnet.net
- Subject: [mg38853] Re: Modifying arguments of sub-parts of an expression
- From: atelesforos at hotmail.com (Orestis Vantzos)
- Date: Thu, 16 Jan 2003 03:19:18 -0500 (EST)
- References: <b0335u$n0a$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Use rules!!! incB[expr_]:=incB /. b->1+b Orestis "Gareth J. Russell" <gjr2008 at columbia.edu> wrote in message news:<b0335u$n0a$1 at smc.vnet.net>... > Hi, > > I have an expression such as > > Gamma[a]*Gamma[b]/Beta[a, b]*Gamma[a + b] > > I want to make a new expression where for every subexpression with head Gamma, if the arguments include b, each b is replaced by 1 + b. So, the output from the above expression should be > > Gamma[a]*Gamma[1 + b]/Beta[a, b]*Gamma[1 + a + b] > > I would like to make a named function that performs this operation on an input expression of arbitrary complexity. An example of a more complicated input expression is given below: > > 10*Gamma[a]*Gamma[3 + b]^2*(2*Gamma[1 + a]^2*Gamma[4 + > b]*Gamma[3 + a + b]*Gamma[a]*Gamma[3 + b]*Gamma[4 + a + b])/( > Beta[a, b]^3*Gamma[3 + a + b]^2*Gamma[4 + a + b]*Gamma[5 + a + b]) > > I've tried, but I just can't seem to get the hang of functions that operate on other functions... > > Thanks > > Gareth > Columbia University