How to represent matrices in python

Question

How can I represent matrices in python

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

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

[python] How to represent matrices in python

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