printing a two dimensional array in python

Question

I have to print this python code in a 5x5 array the array should look like this     0 1 4  infinity  3 1 0 2  infinity  4 4 2 0  1         5  inf  inf  1 0   3 3 4 5   3        0   can anyone help me print this table  using indices   for k in range n           for i in range n               for j in range n                   if A i  k  A k  j  lt A i  j                       A i  j  A i  k  A k  j

User · Answer

for i in A      print   t  join map str  i

User · Answer

I used numpy to generate the array  but list of lists array should work similarly    import numpy as np def printArray args       print   t  join args   n   10  Array   np zeros shape  n n   astype  int    for row in Array      printArray  str x  for x in row     If you want to only print certain indices   import numpy as np def printArray args       print   t  join args   n   10  Array   np zeros shape  n n   astype  int    i indices    1 2 3  j indices    2 3 4   for i in i indices printArray  str Array i  j   for j in j indices

User · Answer

using indices  for loops and formatting   import numpy as np  def printMatrix a      print  Matrix      d   a shape 0           d   a shape 1          rows   a shape 0     cols   a shape 1     for i in range 0 rows         for j in range 0 cols            print   6 f   a i j         print    print         def printMatrixE a      print  Matrix      d   a shape 0           d   a shape 1          rows   a shape 0     cols   a shape 1     for i in range 0 rows         for j in range 0 cols            print   6 3f   a i j          print    print         inf   float  inf   A   np array    0 1  4  inf 3         1 0 2 inf 4         4 2 0 1 5         inf inf 1 0 3         3 4 5 3 0     printMatrix A      printMatrixE A        which yields the output   Matrix 5  5       0      1      4    inf      3      1      0      2    inf      4      4      2      0      1      5    inf    inf      1      0      3      3      4      5      3      0  Matrix 5  5   0 000  1 000  4 000    inf  3 000  1 000  0 000  2 000    inf  4 000  4 000  2 000  0 000  1 000  5 000    inf    inf  1 000  0 000  3 000  3 000  4 000  5 000  3 000  0 000

User · Answer

A combination of list comprehensions and str joins can do the job   inf   float  inf   A     0 1 4 inf 3         1 0 2 inf 4         4 2 0 1 5         inf inf 1 0 3         3 4 5 3 0    print   n  join     join     4   format item  for item in row          for row in A      yields     0   1   4 inf   3    1   0   2 inf   4    4   2   0   1   5  inf inf   1   0   3    3   4   5   3   0     Using for-loops with indices is usually avoidable in Python  and is not considered  Pythonic  because it is less readable than its Pythonic cousin  see below   However  you could do this   for i in range n       for j in range n           print    4   format A i  j        print   The more Pythonic cousin would be   for row in A      for val in row          print    4   format val       print   However  this uses 30 print statements  whereas my original answer uses just one

User · Answer

There is always the easy way   import numpy as np print np matrix A

User · Answer

print mat   str        where mat is variable refering to your matrix object

User · Answer

In addition to the simple print answer  you can actually customise the print output through the use of the numpy set printoptions function   Prerequisites    gt  gt  gt  import numpy as np  gt  gt  gt  inf   np float  inf    gt  gt  gt  A   np array   0 1 4 inf 3   1 0 2 inf 4   4 2 0 1 5   inf inf 1 0 3   3 4 5 3 0      The following option    gt  gt  gt  np set printoptions infstr   infinity      Results in    gt  gt  gt  print A            0          1          4   infinity          3             1          0          2   infinity          4             4          2          0          1          5      infinity   infinity          1          0          3             3          4          5          3          0      The following option    gt  gt  gt  np set printoptions formatter   float     t   0 0f  t  format     Results in    gt  gt  gt  print A       0       1       4       inf     3         1       0       2       inf     4         4       2       0       1       5         inf     inf     1       0       3         3       4       5       3       0         If you just want to have a specific string output for a specific array  the function numpy array2string is also available

[python] printing a two dimensional array in python

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