How to call an element in a numpy array

Question

This is a really simple question  but I didnt find the answer  How to call an element in an numpy array   import numpy as np  arr   np array   1 2 3 4 5   6 7 8 9 10     print arr 0 0    The code above doesn t work

User · Answer

Also  you could try to use ndarray item    for example  arr item  0  0   rowid colid to index  or arr item 0  flatten index   its doc https   docs scipy org doc numpy reference generated numpy ndarray item html

User · Answer

TL DR   Using slicing    gt  gt  gt  import numpy as np  gt  gt  gt    gt  gt  gt  arr   np array   1 2 3 4 5   6 7 8 9 10     gt  gt  gt    gt  gt  gt  arr 0 0  1  gt  gt  gt  arr 1 1  7  gt  gt  gt  arr 1 0  6  gt  gt  gt  arr 1 -1  10  gt  gt  gt  arr 1 -2  9     In Long   Hopefully this helps in your understanding     gt  gt  gt  import numpy as np  gt  gt  gt  np array    1 2 3    4 5 6     array   1  2  3           4  5  6     gt  gt  gt  x   np array    1 2 3    4 5 6      gt  gt  gt  x 1  2    2nd row  3rd column  6  gt  gt  gt  x 1 2    Similarly 6   But to appreciate why slicing is useful  in more dimensions    gt  gt  gt  np array     1 2 3    4 5 6      7 8 9   10 11 12      array     1   2   3             4   5   6               7   8   9            10  11  12      gt  gt  gt  x   np array     1 2 3    4 5 6      7 8 9   10 11 12        gt  gt  gt  x 1  0  2    2nd matrix  1st row  3rd column 9  gt  gt  gt  x 1 0 2    Similarly 9   gt  gt  gt  x 1  0 2  2    2nd matrix  1st row  3rd column Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  IndexError  index 2 is out of bounds for axis 0 with size 2   gt  gt  gt  x 1  0 2  2    2nd matrix  1st and 2nd row  3rd column array   9  12     gt  gt  gt  x 1  0 2  1 3    2nd matrix  1st and 2nd row  2nd and 3rd column array    8   9           11  12

User · Answer

Just use square brackets instead   print arr 1 1

User · Answer

If you are using numpy and your array is an np array of np array elements like   A   np array  np array  10 11 12 13    np array  15 16 17 18    np array  19 110 111 112      and you want to access the inner elements  like 10 11 12 13 14         then use   A 0  0  instead of A 0 0   For example    gt  gt  gt  import numpy as np  gt  gt  gt A   np array  np array  10 11 12 13    np array  15 16 17 18    np array  19 110 111 112      gt  gt  gt  A 0  0   gt  gt  gt  10  gt  gt  gt  A 0 0   gt  gt  gt  Throws ERROR    P S   Might be useful when using numpy array split

User · Answer

Use numpy  array  flatten   to convert a 2D NumPy array into a 1D array print array 2d  array 1d   array 2d  flatten   flatten array 2d print array 1d

[python] How to call an element in a numpy array?

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