Re: problem with append

• To: mathgroup at smc.vnet.net
• Subject: [mg129529] Re: problem with append
• From: svkeeley at aol.com
• Date: Mon, 21 Jan 2013 00:06:42 -0500 (EST)
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• Delivered-to: l-mathgroup@wolfram.com
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• References: <kdg2kv\$hf8\$1@smc.vnet.net>

```> For[a = 2, a < 6, a++,
>
>  	For[b = 2, b < 6, b++,
>
>   Appendto[rr = {}, a^b]]]
>
> rr

One thing wrong is that everytime through the loop, you reset rr to an empty set. The AppendTo statement should read "Appendto[rr, a^b]" with rr assigned to {} before the loop.

This works:

rr = {};
For[a = 2, a < 6, a++,
For[b = 2, b < 6, b++, AppendTo[rr, a^b]]];
rr

{4,8,16,32,9,27,81,243,16,64,256,1024,25,125,625,3125} In[9]:= rr = {};

So does this:

rr = {};
For[a = 2, a < 6, a++,
For[b = 2, b < 6, b++, rr = Append[rr, a^b]]];
rr

{4,8,16,32,9,27,81,243,16,64,256,1024,25,125,625,3125}

```

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