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POhow to perform coordinates affine transformation using python? part 2
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  1. POhow to perform coordinates affine transformation using python? part 2
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    copied!<p>I have same problem as described here: <a href="https://stackoverflow.com/questions/8873462/how-to-perform-coordinates-affine-transformation-using-python?answertab=votes#tab-top">how to perform coordinates affine transformation using python?</a></p> <p>I was trying to use method described but some reason I will get error messages. Changes I made to code was to replace primary system and secondary system points. I created secondary coordinate points by using different origo. In real case for which I am studying this topic will have some errors when measuring the coordinates.</p> <blockquote> <pre><code>primary_system1 = (40.0, 1160.0, 0.0) primary_system2 = (40.0, 40.0, 0.0) primary_system3 = (260.0, 40.0, 0.0) primary_system4 = (260.0, 1160.0, 0.0) secondary_system1 = (610.0, 560.0, 0.0) secondary_system2 = (610.0,-560.0, 0.0) secondary_system3 = (390.0, -560.0, 0.0) secondary_system4 = (390.0, 560.0, 0.0) </code></pre> </blockquote> <p>Error I get from when executing is following.</p> <pre><code>*Traceback (most recent call last): File "affine_try.py", line 57, in &lt;module&gt; secondary_system3, secondary_system4 ) File "affine_try.py", line 22, in solve_affine A2 = y * x.I File "/usr/lib/python2.7/dist-packages/numpy/matrixlib/defmatrix.py", line 850, in getI return asmatrix(func(self)) File "/usr/lib/python2.7/dist-packages/numpy/linalg/linalg.py", line 445, in inv return wrap(solve(a, identity(a.shape[0], dtype=a.dtype))) File "/usr/lib/python2.7/dist-packages/numpy/linalg/linalg.py", line 328, in solve raise LinAlgError, 'Singular matrix' numpy.linalg.linalg.LinAlgError: Singular matrix* </code></pre> <p>What might be the problem ?</p>
 

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