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  • python - How to define a two-dimensional array? - Stack Overflow
    This is how I usually create 2D arrays in python col = 3 row = 4 array = [[0] * col for _ in range(row)] I find this syntax easy to remember compared to using two for loops in a list comprehension
  • python - How to create a multi-dimensional list - Stack Overflow
    Basically, I want a 10x10 grid - a list of 10 lists each containing 10 items Each list value should be initialized to the integer 0 The obvious way to do this in a one-liner: myList = [[0]*10]*10 won't work because it produces a list of 10 references to one list, so changing an item in any row changes it in all rows
  • How to initialize a two-dimensional array (list of lists, if not using . . .
    @codemuncher The reason that [[0] * col] * row doesn't do what you want is because when you initialize a 2d list that way, Python will not create distinct copies of each row Instead it will init the outer list with pointers to the same copy of [0]*col Any edit you make to one of the rows will then be reflected in the remaining rows since they
  • Python: how to combine two flat lists into a 2D array?
    I have two flat lists of geographical coordinates (lat, long), and I need to combine them into a 2D array or matrix They are now stored in a dataframe: lat lon 0 48 010258 -6 156909 1 48 021648 -6 105887 2 48 033028 -6 054801 3 48 044384 -6 003691 4 48 055706 -5 952602 5 48 067017 -5 901447 6 48 078304 -5 850270 7 48 089558 -5 799114 8 48
  • python - Create a 2D list out of 1D list - Stack Overflow
    I am a bit new to Python and I want to convert a 1D list to a 2D list, given the width and length of this matrix Say I have a list=[0,1,2,3] and I want to make a 2 by 2 matrix of this list How
  • list - Creating a 2d matrix in python - Stack Overflow
    You also have a list with a reference to the inner list as it's first and only entry When you multiply it by 6, you are getting 5 more references to the inner list as you understand But the point is that theres no problem with the inner list , just the outer one so there's no need to expand the construction of the inner lists out into a
  • python - 2d array of zeros - Stack Overflow
    @AnmolJagetia This list comprehension won't create M references to the same [0]*N list; it will create M such lists, and you shouldn't see mutations of one row affecting any others In a list comprehension, e g [expr for _ in range(M)], expr is evaluated M times, which in this case results in M lists being created
  • 2D array of lists in python - Stack Overflow
    I am trying to create a 2d matrix so that each cell contains a list of strings Matrix dimensions are known before the creation and I need to have access to any element from the beginning (not populating a matrix dynamically) I think some kind of pre-allocation of space is needed For example, I would like to have a 2X2 matrix:
  • How to input matrix (2D list) in Python? - Stack Overflow
    mat = [list(map(int,input() split())) for i in range(row)] explanation with example: input() takes a string as input "1 2 3" split() splits the string by whitespaces and returns a list of strings ["1", "2", "3"] list(map(int, )) transforms maps the list of strings into a list of ints [1, 2, 3]
  • Simple way of creating a 2D array with random numbers (Python)
    (P S It's a good idea to get in the habit of saying list when you mean list and reserving array for numpy ndarrays There's actually a built-in array module with its own array type, so that confuses things even more, but it's relatively seldom used )





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