MathGroup Archive 2000

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

Search the Archive

Re: Applying position-dependent functions on lists.


Hi,

MapIndexed may help you because

?MapIndexed

"MapIndexed[f, expr] applies f to the elements of expr, giving the part
\
specification of each element as a second argument to f. MapIndexed[f,
expr, \
levspec] applies f to all parts of expr on levels specified by levspec."


So

MapIndexed[(pos=First[2];elem=#1; doSomethingWithPosAndElem)
&,matrix,{2}]

willgive you the positions.

Hope that helps
  Jens

Manolis Petrakis wrote:
> 
> Hi there
> 
> I'm trying to write a program for solving the 2-D Ising model, but not using
> the standard Do[...] approach, to modify every spin on a spin list, using
> the Metropolis Function.
> 
> This problem can be generalized if anyone wants to apply functions on
> matrices that depend on element positions, and require the values of nearest
> neighbor elements.
> 
> If anyone understands my problem, i will be glad to receive any suggestion.
> 
> -----------------------------
> Manolis Petrakis,
> University of Crete, Greece,
> Physics Dept.


  • Prev by Date: Periodic continued fractions -- suggestions wanted
  • Next by Date: Re: Please help with a Hypergeometric2F1 problem...
  • Previous by thread: Applying position-dependent functions on lists.
  • Next by thread: Re: Applying position-dependent functions on lists.