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Re: An Array of Equation Parameters

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59895] Re: [mg59861] An Array of Equation Parameters
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Thu, 25 Aug 2005 06:33:29 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

m=Array[a,{3,4}];

f@@#&/@m

{f(a(1,1),a(1,2),a(1,3),a(1,4)),f(a(2,1),a(2,2),a(2,3),a(2,4)),f(a(
    3,1),a(3,2),a(3,3),a(3,4))}

f@@@m

{f(a(1,1),a(1,2),a(1,3),a(1,4)),f(a(2,1),a(2,2),a(2,3),a(2,4)),f(a(
    3,1),a(3,2),a(3,3),a(3,4))}

%==%%

True

To change the order of the parameters

f[#[[3]],#[[2]],#[[1]],#[[4]]]&/@m

{f(a(1,3),a(1,2),a(1,1),a(1,4)),f(a(2,3),a(2,2),a(2,1),a(2,4)),f(a(
    3,3),a(3,2),a(3,1),a(3,4))}

f@@#[[{3,2,1,4}]]&/@m

{f(a(1,3),a(1,2),a(1,1),a(1,4)),f(a(2,3),a(2,2),a(2,1),a(2,4)),f(a(
    3,3),a(3,2),a(3,1),a(3,4))}

%==%%

True


Bob Hanlon

> 
> From: acvwilson at gmail.com
To: mathgroup at smc.vnet.net
> Date: 2005/08/24 Wed AM 06:30:40 EDT
> Subject: [mg59895] [mg59861] An Array of Equation Parameters
> 
> This seems like a fairly easy problem in other languages but I can't
> figure out how to do it in Mathematica.
> 
> I am trying to set up an array of equation parameters, where each entry
> in the array is a list of parameters for a function.  I also don't know
> how to get values out of a list to plug into the function.  If anyone
> knows how to solve this problem please help me out.
> 
> Thanks,
> Asa
> 
> 


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