Re: Finding Clusters

• To: mathgroup at smc.vnet.net
• Subject: [mg117126] Re: Finding Clusters
• From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
• Date: Thu, 10 Mar 2011 06:10:38 -0500 (EST)
• References: <il7q9m\$dti\$1@smc.vnet.net>

```How about the good old ReplaceAll (/.)?

In[161]:= {x,
y} /. {{x -> 9.95043, y -> 0.201587}, {x -> -0.0507389,
y -> 0.39451}, {x -> -0.0502288 + 0.192544 I,
y -> 0.199992 - 2.42154*10^-6 I}, {x -> -0.0502288 - 0.192544 I,
y -> 0.199992 + 2.42154*10^-6 I}, {x -> -0.0507405,
y -> 0.394519}, {x -> -0.0502287 + 0.192544 I,
y -> 0.2}, {x -> -0.0502287 - 0.192544 I,
y -> 0.2}, {x -> -0.0507405, y -> 0.00548135}}

Out[161]= {{9.95043, 0.201587}, {-0.0507389,
0.39451}, {-0.0502288 + 0.192544 I,
0.199992 - 2.42154*10^-6 I}, {-0.0502288 - 0.192544 I,
0.199992 + 2.42154*10^-6 I}, {-0.0507405,
0.394519}, {-0.0502287 + 0.192544 I, 0.2}, {-0.0502287 - 0.192544 I,
0.2}, {-0.0507405, 0.00548135}}

Cheers -- Sjoerd

On Mar 9, 1:03=C2 pm, Martin Vavpoti=C4=8D <martin.vavpo... at gmail.com> wrote:
> Hello everyone.
>
> I have a large array of numbers (1000 =D72). I wish to find clusters in
> that mesh of numbers but the FindClusters method is giving me a hard
> time. I think it's because of those non-numeric leftovers from NSolve
> (x -> and y ->).
>
> {{x -> 9.95043, y -> 0.201587}, {x -> -0.0507389,
> =C2  y -> 0.39451}, {x -> -0.0502288 + 0.192544 I,
> =C2  y -> 0.199992 - 2.42154*10^-6 I}, {x -> -0.0502288 - 0.192544 I,
> =C2  y -> 0.199992 + 2.42154*10^-6 I}, <<992>>, {x -> -0.0507405,
> =C2  y -> 0.394519}, {x -> -0.0502287 + 0.192544 I,
> =C2  y -> 0.2}, {x -> -0.0502287 - 0.192544 I,
> =C2  y -> 0.2}, {x -> -0.0507405, y -> 0.00548135}}
>
> I know that if you write something like %[[1,2,2]] you get only the
> numbers but I have a whole array here. How do I get the whole array to
> lose those y -> ?
>
> Help anyone?

```

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