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Date: Fri, 31 May 2013 02:54:38 -0700
Subject: Re: Finding Relative Maxima in Python3
From: Chris Rebert <clp2@rebertia.com>
To: lourensjan.ugen@gmail.com
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On May 31, 2013 2:46 AM, "Lourens-Jan Ugen" <lourensjan.ugen@gmail.com>
wrote:
>
> Hi all,
>
> The last few days I've been working on a script to manipulate some
scientific data. One thing I would like to be able to do is find relative
maxima in a data set.
> I'm using numpy in python3 (which I think I can't do without because of
utf16 encoding of my data source) and a series of np.arrays. When looking
around the web and some forums I came across the scipy function
argrelextrema, which seemed to do just what I wanted. The problem is that I
can't get the function to work, probably because scipy in python3 does not
yet support the argrelextrema function. I can however, not find a reference
to this really being the problem, and was wondering if someone here could
maybe help me out.
> The code I used is shown below. The function to return the maximum values
is called by a different script. Then, when running, it returns an error
like the one below the code.
>
> Script:
> import numpy as np
> import scipy as sp
<snip>
> Error message:
> Traceback (most recent call last):
>   File "MyScript.py", line 15, in <module>
>     Varrr = FD.max_in_array_range(CalcAndDiffArray, 5 ,MyBound)
>   File "/MyPath/Script.py", line 82, in max_in_array_range
>     return sp.argrelmax(TempArray[LowBound:], np.greater)
> AttributeError: 'module' object has no attribute 'argrelmax'

The docs would seem to indicate that that function resides in the "signal"
submodule of scipy:
http://docs.scipy.org/doc/scipy-dev/reference/generated/scipy.signal.argrelmax.html#scipy.signal.argrelmax

Hence, it would be sp.signal.argrelmax() as opposed to just sp.argrelmax()

Cheers,
Chris

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<p dir=3D"ltr">On May 31, 2013 2:46 AM, &quot;Lourens-Jan Ugen&quot; &lt;<a=
 href=3D"mailto:lourensjan.ugen@gmail.com">lourensjan.ugen@gmail.com</a>&gt=
; wrote:<br>
&gt;<br>
&gt; Hi all,<br>
&gt;<br>
&gt; The last few days I&#39;ve been working on a script to manipulate some=
 scientific data. One thing I would like to be able to do is find relative =
maxima in a data set.<br>
&gt; I&#39;m using numpy in python3 (which I think I can&#39;t do without b=
ecause of utf16 encoding of my data source) and a series of np.arrays. When=
 looking around the web and some forums I came across the scipy function ar=
grelextrema, which seemed to do just what I wanted. The problem is that I c=
an&#39;t get the function to work, probably because scipy in python3 does n=
ot yet support the argrelextrema function. I can however, not find a refere=
nce to this really being the problem, and was wondering if someone here cou=
ld maybe help me out.<br>

&gt; The code I used is shown below. The function to return the maximum val=
ues is called by a different script. Then, when running, it returns an erro=
r like the one below the code.<br>
&gt;<br>
&gt; Script:<br>
&gt; import numpy as np<br>
&gt; import scipy as sp<br>
&lt;snip&gt;<br>
&gt; Error message:<br>
&gt; Traceback (most recent call last):<br>
&gt; =C2=A0 File &quot;MyScript.py&quot;, line 15, in &lt;module&gt;<br>
&gt; =C2=A0 =C2=A0 Varrr =3D FD.max_in_array_range(CalcAndDiffArray, 5 ,MyB=
ound)<br>
&gt; =C2=A0 File &quot;/MyPath/Script.py&quot;, line 82, in max_in_array_ra=
nge<br>
&gt; =C2=A0 =C2=A0 return sp.argrelmax(TempArray[LowBound:], np.greater)<br=
>
&gt; AttributeError: &#39;module&#39; object has no attribute &#39;argrelma=
x&#39;</p>
<p dir=3D"ltr">The docs would seem to indicate that that function resides i=
n the &quot;signal&quot; submodule of scipy:<br>
<a href=3D"http://docs.scipy.org/doc/scipy-dev/reference/generated/scipy.si=
gnal.argrelmax.html#scipy.signal.argrelmax">http://docs.scipy.org/doc/scipy=
-dev/reference/generated/scipy.signal.argrelmax.html#scipy.signal.argrelmax=
</a></p>

<p dir=3D"ltr">Hence, it would be sp.signal.argrelmax() as opposed to just =
sp.argrelmax()</p>
<p dir=3D"ltr">Cheers,<br>
Chris</p>

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