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From: Nobody <nobody@nowhere.com>
Subject: Re: data type and logarithm
Date: Thu, 16 Jun 2011 10:16:52 +0100
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On Thu, 16 Jun 2011 01:37:08 -0700, simona bellavista wrote:

> print rho.dtype
> print entropy.dtype
> 
> I get  |S22 , what's that?

A string. You probably want to convert "columns" to floats before
appending its elements to the array.