Access elements in 2d array python
I would like to understand how one goes about manipulating the elements of a 2D array. Show If I have for example:
I have defined them in python as for example:
I saw that I cannot refer to
Gino Mempin 20.8k24 gold badges84 silver badges111 bronze badges asked Aug 11, 2011 at 7:20
3 If you have
Then
Will work fine. It points to the second column, second row just like you wanted. I'm not sure what you did wrong. To multiply the cells in the third column you can just do
Which will work for any number of rows. Edit: The first number is the column, the second number is the row, with your current layout. They are both numbered from zero. If you want to switch the order you can do
or you can create it that way:
answered Aug 11, 2011 at 7:27
agfagf 164k40 gold badges278 silver badges232 bronze badges 2 If you want do many calculation with 2d array, you should use NumPy array instead of nest list. for your question, you can use:zip(*a) to transpose it:
answered Aug 11, 2011 at 7:29
HYRYHYRY 91.4k25 gold badges183 silver badges186 bronze badges Look carefully how many brackets does your array have. I met an example when function returned answer with extra bracket, like that:
And this didn't work
This could open the brackets:
Now it is possible to use an ordinary element access notation:
answered Jan 30, 2017 at 11:05
Seems to work here:
answered Aug 11, 2011 at 7:26
cdhowiecdhowie 149k23 gold badges278 silver badges290 bronze badges If you have this :
You can easily access this by using :
F Blanchet 1,3003 gold badges18 silver badges31 bronze badges answered Jun 3, 2019 at 16:26
answered Aug 11, 2011 at 7:28
KenjiKenji 7175 silver badges9 bronze badges How do you access elements in a 2D array?An element in 2-dimensional array is accessed by using the subscripts. That is, row index and column index of the array. int x = a[1,1]; Console.
How do you access the elements of a 2D list in Python?Use list indexing to access elements in a 2D list. Use the list indexing syntax a_2d_list[x][y] to access an element at index y in the nested list at index x .
How do you access the elements of a matrix in Python?Accessing Values
The data elements in a matrix can be accessed by using the indexes. The access method is same as the way data is accessed in Two dimensional array.
How do you iterate a 2D array in Python?Traversing in a 2D array in python can be done by using a for loop. We can iterate through the outer array first and then at each element of the outer array, we have another array which is our inner array containing the elements. So for each inner array, we run a loop to traverse its elements.
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