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Some Octave magic!

>> A = reshape([1 2 3 4],[2 2])
A =
        1        3
        2        4
>> b = [1; 2]
b =
        1
        2
>> x = A\b
x =
        1
        0

And now some more Python magic!

>>> from math import pi
>>> import numpy as np
>>> x = np.arange(0,2*pi,pi/10)
>>> y = np.sin(x)
>>> y
array([  0.00000000e+00,   3.09016994e-01,   5.87785252e-01,
         8.09016994e-01,   9.51056516e-01,   1.00000000e+00,
         9.51056516e-01,   8.09016994e-01,   5.87785252e-01,
         3.09016994e-01,   1.22460635e-16,  -3.09016994e-01,
        -5.87785252e-01,  -8.09016994e-01,  -9.51056516e-01,
        -1.00000000e+00,  -9.51056516e-01,  -8.09016994e-01,
        -5.87785252e-01,  -3.09016994e-01])

Cool!