How to represent matrices in python

Question

How can I represent matrices in python

User · Answer

1 2 3 4     5 6 7 8     9 0 1 2     Using tuples instead of lists makes it marginally harder to change the data structure in unwanted ways   If you are going to do extensive use of those  you are best off wrapping a true number array in a class  so you can define methods and properties on them   Or  you could NumPy  SciPy      if you are going to do your processing with those libraries

User · Answer

If you are not going to use the NumPy library  you can use the nested list  This is code to implement the dynamic nested list  2-dimensional lists    Let r is the number of rows  let r 3  m    for i in range r       m append  int x  for x in raw input   split       Any time you can append a row using  m append  int x  for x in raw input   split       Above  you have to enter the matrix row-wise  To insert a column   for i in m      i append x    x is the value to be added in column   To print the matrix   print m         all in single row  for i in m      print i     each row in a different line

User · Answer

Take a look at this answer   from numpy import matrix from numpy import linalg A   matrix    1 2 3   11 12 13   21 22 23      Creates a matrix  x   matrix    1   2   3                        Creates a matrix  like a column vector   y   matrix    1 2 3                            Creates a matrix  like a row vector   print A T                                      Transpose of A  print A x                                      Matrix multiplication of A and x  print A I                                      Inverse of A  print linalg solve A  x        Solve the linear equation system

User · Answer

Python doesn t have matrices  You can use a list of lists or NumPy

[python] How to represent matrices in python

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