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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: problem with exam task for college
Date: Mon, 14 Jan 2013 13:54:59 -0500
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Xref: csiph.com comp.lang.python:36810

On Mon, 14 Jan 2013 08:01:03 -0800 (PST), jeltedeproft@hotmail.com
declaimed the following in gmane.comp.python.general:

> this is what i have right now, it tells me i can't multiply a vector with a vector, i have to find a way to multiply the speed with the updated angle (=hoek in dutch)
>

	It's a trite saying but:

	How would you perform this vector multiplication by hand? Write down
the steps... Now convert those steps into Python code.

	Or -- download/install something like NumPy and recode your program
using NumPy vector types which should support the needed
multiplications.
 
>>> import numpy
>>> a = numpy.array(	(2.78, 3.14, 1958)	)
>>> b = numpy.array(	(1.5, 2.0, 1.0)	)
>>> 
>>> a*b
array([    4.17,     6.28,  1958.  ])
>>> a.dot(b)
1968.45
>>> 
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/