Re: Simple list question

• To: mathgroup at smc.vnet.net
• Subject: [mg132591] Re: Simple list question
• From: Bob Hanlon <hanlonr357 at gmail.com>
• Date: Mon, 14 Apr 2014 23:01:19 -0400 (EDT)
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• References: <20140414092810.CE3046A50@smc.vnet.net>

```Use Join rather than Append

pcin = 2;
pcex = 3;

coin = Table[{10 RandomReal[], 10 RandomReal[]}, {pcin}];
coex = Table[{3 RandomReal[], 3 RandomReal[]}, {pcex}];

cobo = Join[coin, coex];

Dimensions[cobo]

{5, 2}

Bob Hanlon

On Mon, Apr 14, 2014 at 5:28 AM, Ste[hen Gray <stevebg at roadrunner.com>wrote:

> pcin = 2;
> pcex = 3;   (*pcin and pcex can have various small values *)
>
> coin = Table[{10 RandomReal[], 10 RandomReal[]}, {pcin}]
> coex = Table[{3 RandomReal[], 3 RandomReal[]}, {pcex}]
> cobo = Append[coin, coex]
>
>
> gives, typically,
>
> {{0.288346, 3.57763}, {1.7335, 8.69666}}
> {{0.179831, 1.35324}, {0.927483, 0.931586}, {1.76338, 2.45073}}
> {{0.288346, 3.57763}, {1.7335,
>    8.69666}, {{0.179831, 1.35324}, {0.927483, 0.931586}, {1.76338,
>     2.45073}}}
>
> What I want is a series of x,y coordinates with no extra nesting:
>
> {{0.288346, 3.57763}, {1.7335,
>    8.69666}, {0.179831, 1.35324}, {0.927483, 0.931586}, {1.76338,
>     2.45073}}
>
> I'm embarrassed to admit that I can't find how to do this.
>
> Please email me. Thank you.
>