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

*To*: mathgroup at smc.vnet.net*Subject*: [mg96095] Re: Loop programming; how do i do this ???*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Thu, 5 Feb 2009 04:37:08 -0500 (EST)*References*: <gmbr29$igp$1@smc.vnet.net>

Not sure what TEST does, so the following may or may not work for you. A short way of having TEST act on all combinations of the selected 2D array elements would be: TEST @@@ Tuples[DArrayCon[[DArrayVar]]] Note that variable names cannot start with a number in Mathematica (and in many other programming languages) so I have removed the 1 and 2 from your names. Note also that TEST should be able to handle a variable number of arguments. Cheers -- Sjoerd On Feb 4, 12:35 pm, plzhlp <n... at live.be> wrote: > I need to implement a function into my notebook but am having great diffi= culties even getting started (i'm new to mathematica and programming in gen= eral) > > The function accepts a 1d array (of variable length) of integers > > which will refer to a 2d array of constants, of which all need to be test= ed against eachother. > > for example: > > 1DArrayVar = {2, 4, 5} > > 2DArrayCon = { > {a1,b1,c1}, > {a2,b2,c2}, > {a3,b3,c3}, > {a4,b4,c4}, > {a5,b5,c5} > } > > Function[1DArrayVar] > > in this scenario will test: > > Do[ > Do[ > Do[ > > TEST[2DArrayCon[[2,x]],2DArrayCon[[4,y]],2DArrayCon[[5,z]]] > > , {x, Length[DArrayCon[[2]]] > , {y, Length[DArrayCon[[4]]] > , {z, Length[DArrayCon[[5]]] > > So basically the problem is that i need a variable amount of nested loops= , as the length of 1DArrayVar will always be unknown. > > >From some research on the internet i've learned a recursive algorithm mi= ght be the solution, but i am completely lost on how to start -- > > any tips would be really appreciated !