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Re: Loop programming; how do i do this ???

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96117] Re: Loop programming; how do i do this ???
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Thu, 5 Feb 2009 04:41:14 -0500 (EST)
  • References: <gmbr29$igp$1@smc.vnet.net>

On Thu, Feb 5, 2009 at 4:14 AM, naso e-o <naso at live.be> wrote:

> Thankyou very much for your response this does exactly what i want,
>
> though is it possible the test function can receive its arguments as 1 list
> rather than individual elements (as i dont know how i can define a function
> which accepts a variable amount of arguments)

[snip]

Sure: we write test[{##}] & rather than just test as first argument of
Outer. This is a pure function that takes a sequence of arguments ##,
changes this sequence into a list {##}, and passes this list to the
actual function test. So the full expression is

    Outer[test[{##}] &, Sequence @@ (cons[[#]] & /@ vars)]

For instance,

In[1]:= vars = {2, 4, 5};
cons = {{a1, b1, c1}, {a2, b2, c2}, {a3, b3, c3}, {a4, b4, c4}, {a5,
    b5, c5}};

Outer[test[{##}] &, Sequence @@ (cons[[#]] & /@ vars)]

Out[3]= {{{test[{a2, a4, a5}], test[{a2, a4, b5}],
   test[{a2, a4, c5}]}, {test[{a2, b4, a5}], test[{a2, b4, b5}],
   test[{a2, b4, c5}]}, {test[{a2, c4, a5}], test[{a2, c4, b5}],
   test[{a2, c4, c5}]}}, {{test[{b2, a4, a5}], test[{b2, a4, b5}],
   test[{b2, a4, c5}]}, {test[{b2, b4, a5}], test[{b2, b4, b5}],
   test[{b2, b4, c5}]}, {test[{b2, c4, a5}], test[{b2, c4, b5}],
   test[{b2, c4, c5}]}}, {{test[{c2, a4, a5}], test[{c2, a4, b5}],
   test[{c2, a4, c5}]}, {test[{c2, b4, a5}], test[{c2, b4, b5}],
   test[{c2, b4, c5}]}, {test[{c2, c4, a5}], test[{c2, c4, b5}],
   test[{c2, c4, c5}]}}}


HTH,
--Jean-Marc


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