Currently I am going through the functions available in Matrix. One thing
that I have noticed as an ordinary python programmer(not the developer) :
*Huge error is displayed if we call the functions with incorrect parameter.*
*For example: *
Following set of code will be an error as I am trying to access the matrix
element out of index range.
*from sympy import **
*M = Matrix([[1, 2, 3], [3, 2, 1]])*
*print(M.col(3))*
*output:*
Traceback (most recent call last):
File "C:\Python33\lib\site-packages\sympy\matrices\dense.py", line 74, in
__ge
titem__
i, j = self.key2ij(key)
File "C:\Python33\lib\site-packages\sympy\matrices\matrices.py", line
1087, in
key2ij
for i, n in zip(key, self.shape)]
File "C:\Python33\lib\site-packages\sympy\matrices\matrices.py", line
1087, in
<listcomp>
for i, n in zip(key, self.shape)]
File "C:\Python33\lib\site-packages\sympy\matrices\matrices.py", line
4125, in
a2idx
raise IndexError("Index out of range: a[%s]" % (j, ))
IndexError: Index out of range: a[3]
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "matrix.py", line 3, in <module>
print(M.col(3))
File "C:\Python33\lib\site-packages\sympy\matrices\dense.py", line 195,
in col
return self[:, j]
File "C:\Python33\lib\site-packages\sympy\matrices\dense.py", line 89, in
__ge
titem__
return self.extract(i, j)
File "C:\Python33\lib\site-packages\sympy\matrices\matrices.py", line
1039, in
extract
colsList = [a2idx(k, self.cols) for k in colsList]
File "C:\Python33\lib\site-packages\sympy\matrices\matrices.py", line
1039, in
<listcomp>
colsList = [a2idx(k, self.cols) for k in colsList]
File "C:\Python33\lib\site-packages\sympy\matrices\matrices.py", line
4125, in
a2idx
raise IndexError("Index out of range: a[%s]" % (j, ))
IndexError: Index out of range: a[3]
*This huge error is not needed for an ordinary programmer who will not be
interested in the code of the library used. Only he/she must be notified
that the matrix is access using index which is out of range. So only the
following two lines are enough. It is just my own opinion.*
File "matrix.py", line 3, in <module> print(M.col(3))
IndexError: Index out of range: a[3]
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