Re: Simple list question

• To: mathgroup at smc.vnet.net
• Subject: [mg132593] Re: Simple list question
• From: Bill Rowe <readnews at sbcglobal.net>
• Date: Mon, 14 Apr 2014 23:01:59 -0400 (EDT)
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```On 4/14/14 at 5:28 AM, stevebg at roadrunner.com (Ste[hen Gray) 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]
>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]

<snip>

>What I want is a series of x,y coordinates with no extra nesting:

Instead of Append, use Join, i.e.

cobo = Join[coin, coex]

In fact, Append is something to generally avoid using
particularly for large arrays due to the computing resources
used. It will require more memory and is slower. Won't matter
for small arrays like this. But for large arrays, Append is very
much a problem and better replaced with other commands such as Join.

```

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