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From: Emile van Sebille <emile@fenx.com>
Subject: Re: numpy - 2D matrix/array - initialization like in Matlab...
Date: Mon, 15 Oct 2012 14:52:26 -0700
References: <k5hu2e$h5i$1@dont-email.me>
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Xref: csiph.com comp.lang.python:31345

someone wrote:
> How to initialize my array directly using variables ?
> 
> It could also be that I wanted:
> 
> test11 = 1
> test12 = 1.5
> test13 = 2
> test21 = 0
> test22 = 5
> 
> Dx = numpy.matrix('test11 test12 test13; test21 test22 -0.5; 0 -0.5 1.5')
> 
> Etc... for many variables...
> 
> Appreciate ANY help, thank you very much!

You could use string interpolation:

Dx = numpy.matrix('%s %s %s; %s %s -0.5; 0 -0.5 1.5'
               % (test11 test12 test13 test21 test22))


Emile