Re: Creating List
- To: mathgroup at smc.vnet.net
- Subject: [mg125539] Re: Creating List
- From: Ray Koopman <koopman at sfu.ca>
- Date: Sun, 18 Mar 2012 02:41:48 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <jk1ft6$50r$1@smc.vnet.net>
On Mar 17, 12:53 am, Harry <hvdos... at gmail.com> wrote:
> Hi out there,
>
> I have calculated some x- and y-values and want to combine them in a
> way that the x and y-values define coordinates. Well, I have:
>
> xkoor[i], {i, 1, iend} and
> ykoor[j], {j, 1, jend}
>
> To be able to continue I need this list:
>
> {{xkoor[1],ykoor[1]},
> {xkoor[2],ykoor[1]},
> {xkoor[3],ykoor[1]},
> {xkoor[4],ykoor[1]},
> {xkoor[1],ykoor[2]},
> {xkoor[2],ykoor[2]},
> {xkoor[3],ykoor[2]},
> {xkoor[4],ykoor[2]},
> {xkoor[1],ykoor[3]},
> {xkoor[2],ykoor[3]},
> {xkoor[3],ykoor[3]},
> {xkoor[4],ykoor[3]}}
>
> and have no idea how to get this. So I would be very happy to get any
> small hint...
>
> Thanks a lot,
>
> Harald
Tuples@{Array[x,4],Array[y,3]}
{{x[1], y[1]},
{x[1], y[2]},
{x[1], y[3]},
{x[2], y[1]},
{x[2], y[2]},
{x[2], y[3]},
{x[3], y[1]},
{x[3], y[2]},
{x[3], y[3]},
{x[4], y[1]},
{x[4], y[2]},
{x[4], y[3]}}
Reverse/@Tuples@{Array[y,3],Array[x,4]}
{{x[1], y[1]},
{x[2], y[1]},
{x[3], y[1]},
{x[4], y[1]},
{x[1], y[2]},
{x[2], y[2]},
{x[3], y[2]},
{x[4], y[2]},
{x[1], y[3]},
{x[2], y[3]},
{x[3], y[3]},
{x[4], y[3]}}