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Re: Applying a list of 2D paramters to a mathematica function

• To: mathgroup at smc.vnet.net
• Subject: [mg68081] Re: [mg68041] Applying a list of 2D paramters to a mathematica function
• From: gardyloo <gardyloo at mail.wsu.edu>
• Date: Fri, 21 Jul 2006 17:36:38 -0400 (EDT)
• References: <200607210937.FAA06876@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi, Curry,

    Here are some ways to do what you want. You have to either re-define
your function (seems easiest to me), or change the way you're applying
it to the list (duh!).

In[13]:=
f[x_, y_] := x + y;

indices = {{a, b}, {c, d}, {e, f}}

Out[14]=
{{a, b}, {c, d}, {e, f}}

In[19]:=
(f[#1[[1]], #1[[2]]] & ) /@ indices

Out[19]=
{a + b, c + d, e + f}

In[20]:=
f2[(x_)?ListQ] := x[[1]] + x[[2]]

In[22]:=
f2 /@ indices

Out[22]=
{a + b, c + d, e + f}

In[29]:=
Apply[#1 + #2 & , indices, {1}]

Out[29]=
{a + b, c + d, e + f}

  

Curry Taylor wrote:
>          I have (for simplicity) something like this:
>
>          f[x_, y_] := x+y;
>
>          I want to use this function for a variety of parameters in a list:
>
>          indices = {{a,b}, {c,d}, {e,f}, ..}
>
>          so that I get
>
>          {a+b, c+d, e+f, ..}
>
>          Doing the intuitive thing (for me)
>
>          f /@ indices
>
>          results in
>
>          {f[{a, b}], f[{c, d}], f[{e, f}], ..}
>
>          but what I want is
>
>          {f[a, b], f[c, d], f[e, f], ..}
>
>          and that's not what I'm getting. I have tried using Flatten, pure 
> functions (Slot # and &), different Map functions, nesting at parameters 
> (like {1} and {2}), and other things but I just can't seem to get what I'm 
> after. Any help please?
>
>          Thank you,
>
> Curry
>
>
>   

-- 
==========================================================
Curtis Osterhoudt          
gardyloo at mail.remove_this.wsu.and_this.edu
PGP Key ID: 0x088E6D7A
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• References:
  • Applying a list of 2D paramters to a mathematica function
    • From: Curry Taylor <curry@192.168.0.101>