Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2006
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: mapping of function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69938] Re: mapping of function
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 28 Sep 2006 06:14:25 -0400 (EDT)
  • References: <efdjnn$ms$1@smc.vnet.net>

Hi,
MapAT does not seem to be a very convenient solution because you have to 
bother about positions. Mathematica can do this on its own by pattern 
matching. E.g.:
exp1 /. {x -> Sin[x], y -> Cos[x]}
Daniel

dimmechan at yahoo.com wrote:
> Hello.
> 
> I am working on John Gray's Book Mastering Mathematica.
> 
> Here is one simple expression.
> 
> exp1 = x^3 + (1 + z)^2
> x^3 + (1 + z)^2
> 
> I am thinking of ways to map the sine function only to {x,z}.
> Here are some alternatives I considered.
> 
> MapAt[Sin, exp1, Flatten[(Position[exp1, #1] & ) /@ Variables[exp1],
> 1]]
> Sin[x]^3 + (1 + Sin[z])^2
> 
> MapAt[Sin, exp1, Position[exp1, _Symbol, Heads -> False]]
> Sin[x]^3 + (1 + Sin[z])^2
> 
> Are there any other possibilities?
> 
> Thanks for any response.
> 


  • Prev by Date: Re: mapping of function
  • Next by Date: Re: equation question
  • Previous by thread: Re: mapping of function
  • Next by thread: Re: Re: mapping of function