[Tutor] Getting range to produce float lists

Wed, 17 Apr 2002 15:23:09 -0700

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It is possible to use Numeric's arange; for example:
(after importing Numeric *)
>>> for i in arange(0.1,0.8,0.1):
... 	print i
... 	
0.1
0.2
0.3
0.4
0.5
0.6
0.7
>>> 
 or in your case ---

>>> for i in arange(0, 0.5, 0.1):
... 	print i
... 	
0.0
0.1
0.2
0.3
0.4
>>> 

Hope this helps.
Bill

-----Original Message-----
From: Michael Williams [mailto:michael.williams@st-annes.oxford.ac.uk]
Sent: Wednesday, April 17, 2002 9:53 AM
To: tutor@python.org
Subject: [Tutor] Getting range to produce float lists

I'm writing a tutorial introducing scientific programming to first year
Physics undergraduates and have got to the bit where I explain for loops
and, by implication range(). It is a common requirement to want to step
the loop in fractional increments, e.g.

[0.0, 0.1, 0.2, 0.3, 0.4]

I would like to do this by doing range(0, 0.5, 0.1) but of course range
only produces integer lists and will round all the arguments (making the
step = 0 if required). Is there a way to do this easily with core
Python or should I hack up a quick function for my students to use?
-- 
Michael

_______________________________________________
Tutor maillist  -  Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor

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<TITLE>RE: [Tutor] Getting range to produce float lists</TITLE>
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It is possible to use Numeric's arange; for =
example:
 (after importing Numeric *)
 &gt;&gt;&gt; for i in arange(0.1,0.8,0.1):
 ... &nbsp;&nbsp;&nbsp; print i
 ... &nbsp;&nbsp;&nbsp; 
 0.1
 0.2
 0.3
 0.4
 0.5
 0.6
 0.7
 &gt;&gt;&gt; 
 &nbsp;or in your case ---

<P><FONT SIZE=3D2>&gt;&gt;&gt; for i in arange(0, 0.5, 0.1):</FONT>
<BR><FONT SIZE=3D2>... &nbsp;&nbsp;&nbsp; print i</FONT>
<BR><FONT SIZE=3D2>... &nbsp;&nbsp;&nbsp; </FONT>
<BR><FONT SIZE=3D2>0.0</FONT>
<BR><FONT SIZE=3D2>0.1</FONT>
<BR><FONT SIZE=3D2>0.2</FONT>
<BR><FONT SIZE=3D2>0.3</FONT>
<BR><FONT SIZE=3D2>0.4</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;&gt; </FONT>
</P>

<P><FONT SIZE=3D2>Hope this helps.</FONT>
<BR><FONT SIZE=3D2>Bill</FONT>
</P>

<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Michael Williams [<A =
HREF=3D"mailto:michael.williams@st-annes.oxford.ac.uk">mailto:michael.wi=
lliams@st-annes.oxford.ac.uk</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Wednesday, April 17, 2002 9:53 AM</FONT>
<BR><FONT SIZE=3D2>To: tutor@python.org</FONT>
<BR><FONT SIZE=3D2>Subject: [Tutor] Getting range to produce float =
lists</FONT>
</P>
<BR>

I'm writing a tutorial introducing scientific =
programming to first year
 Physics undergraduates and have got to the bit where =
I explain for loops
 and, by implication range(). It is a common =
requirement to want to step
 the loop in fractional increments, e.g.

<P><FONT SIZE=3D2>[0.0, 0.1, 0.2, 0.3, 0.4]</FONT>
</P>

I would like to do this by doing range(0, 0.5, 0.1) =
but of course range
 only produces integer lists and will round all the =
arguments (making the
 step =3D 0 if required). Is there a way to do this =
easily with core
 Python or should I hack up a quick function for my =
students to use?
 -- 
 Michael

<P><FONT =
SIZE=3D2>_______________________________________________</FONT>
<BR><FONT SIZE=3D2>Tutor maillist&nbsp; -&nbsp; Tutor@python.org</FONT>
<BR><FONT SIZE=3D2><A =
HREF=3D"http://mail.python.org/mailman/listinfo/tutor" =
TARGET=3D"_blank">http://mail.python.org/mailman/listinfo/tutor</A></FON=
T>
</P>

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