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Array is a linear data structure consisting of list of elements. In this we are specifically going to talk about 2D arrays. 2D Array can be defined as array of an array. 2D array are also called as Matrices which can be represented as collection of rows and columns. In this article, we have explored 2D array in Numpy in Python. NumPy is a library in python adding support for large multidimensional arrays and matrices along with high level mathematical functions to operate these arrays. Benefits of Numpy :
Installing NumPy in windows using CMD
The above line of command will install NumPy into your machine. Basics of NumPyFor working with numpy we need to first import it into python code base.
Creating an ArraySyntax -
In above code we used dtype parameter to specify the datatype To create a 2D array and syntax for the same is given below -
Various functions on ArrayGet shape of an array
Get Datatype of elements in array
Accessing/Indexing specific elementTo get a specific element from an array use
To get all elements of Row or Column
Accessing multiple rows and columns at a time
Initializing different types of an arrayThere are various built-in functions used to initialize an array
Ones Array
Random Array
Identity
Operations on 2D arrayArithmetic Operations
Matrix operation for 2D matrix
Finding Minimum and Maximum from all elements
Finding determinant of a Matrix
Sum of elements along the column and row
Reorganizing ArrayChanging shape of an array
Horizontal Stacking - Concatinating 2 arrays in horizontal manner
Vertical Stacking - Concatinating 2 arrays in vertical manner
QuestionIf we have a 4x4 Identity Matrix named as 'eye' then how would you obtain another 2x2 identity matrix from it.eye[0:2,0:2] eye[1:0,0:1] eye[0:1,0:1] eye[1:2,1:2] As we want first two rows and columns we will start indexing from 0 and it will end at 2. How do you make a twoCreating a Two-dimensional Array
If you only use the arange function, it will output a one-dimensional array. To make it a two-dimensional array, chain its output with the reshape function. First, 20 integers will be created and then it will convert the array into a two-dimensional array with 4 rows and 5 columns.
What is a two2D array are also called as Matrices which can be represented as collection of rows and columns. In this article, we have explored 2D array in Numpy in Python. NumPy is a library in python adding support for large multidimensional arrays and matrices along with high level mathematical functions to operate these arrays.
What is 2D array in python?2D array in python is a two-dimensional data structure, stored linearly in the memory. This means that it has two dimensions, the rows and the columns and thus it also represents a matrix.
What is 2D array with example?Elements in two-dimensional arrays are commonly referred by x[i][j] where 'i' is the row number and 'j' is the column number. For example: int[][] arr = new int[10][20]; arr[0][0] = 1; The above example represents the element present in first row and first column.
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