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MathGroup Archive 2006

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Re: How to handle Arrays that has functional parameters:

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68937] Re: How to handle Arrays that has functional parameters:
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 25 Aug 2006 05:34:49 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <echej1$oqk$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

ff[i_, j_][s_, t_] := ff[i, j] = s^i*t^j

or

ffd[i_, j_][u_:s, v_:t] := ffd[i, j] = s^i*t^j

??

Regards

  Jens

"Gopinath Venkatesan" <gopinathv at ou.edu> schrieb 
im Newsbeitrag news:echej1$oqk$1 at smc.vnet.net...
| Dear Friends
|
| If we have to define an array but also work as a 
function, how do we define them?
|
| For example, consider the following:
|
| \!\(\(func1 = Table[a[i, j], {i, 3}, {j, 
3}];\)\[IndentingNewLine]
|  \(func2[s_, t_, i_, j_] := \(s\^i\) 
t\^j;\)\[IndentingNewLine]
|  \(Do[func1[\([i, j]\)] = func2[s, t,
|         i, j], {i, 3}, {j, 
3}];\)\[IndentingNewLine]
|  func1 // MatrixForm\)
|
| Where I defined func1 to be an array, and func2 
to be a function, and then assigned the func1 
elements using func2 relation.
|
| I wanted to know if we can build this relation 
directly into the array definition?
|
| Like say, func1[[i,j]][s_,t_]:=s^i t^j, inside 
the Do loop, or other alternatives.
|
| The reason is I have some functions of a 
variable, which I dont want to evaluate until the 
last step of the solution - i.e., I dont want to 
evaluate them during the do loop operations, and 
keep it safe and then evaluate in another do loop 
operation where only the variables will change to 
evaluate the lagrangian and hence the individual 
solution for the variable value. I can use the 
following method, it takes some time to fix it, 
but would like to know if we can do it some other 
way.
|
| Thanks,
|
| Gopinath Venkatesan
| Graduate Student
| University of Oklahoma
| 



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