Hi,

I am modifying the file sage/rings/polynomial/term_order.py. If I add
the following line

import sage.matrix.matrix

Then Sage is compiled but Sage does not run but issue the following
error:
...
...
...
/Users/Kwankyu/Sage/local/lib/python2.6/site-packages/sage/matrix/
matrix_space.py in <module>()
     32 # Sage matrix imports

     33 import matrix
---> 34 import matrix_generic_dense
     35 import matrix_generic_sparse
     36

/Users/Kwankyu/Sage/local/bin/matrix_generic_dense.pyx in
sage.matrix.matrix_generic_dense (sage/matrix/matrix_generic_dense.c:
3790)()

/Users/Kwankyu/Sage/local/bin/matrix_dense.pyx in
sage.matrix.matrix_dense (sage/matrix/matrix_dense.c:4981)()

AttributeError: 'module' object has no attribute 'Matrix'
Error importing ipy_profile_sage - perhaps you should run %upgrade?
WARNING: Loading of ipy_profile_sage failed.


What am I doing wrong? Am I doing a circular import?

What I want to do actually is to use the method
sage.matrix.matrix.is_Matrix().

This is perhaps a novice's question... Thank you in advance.

Kwankyu


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