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2d arrays with rows and columns

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Mckynde answered on May 27, 2022 Popularity 10/10 Helpfulness 2/10

answer 2d arrays with rows and columns

related Get columns of 2D array

related Creates a 2D array with the number of rows and columns

2d arrays with rows and columns

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# To create 2 or more dimensional Arrays in python
# A two-dimensional array(list) is like a table with rows and columns.

# Assume there are 1, 2, 3 to n rows and 1, 2, 3 to n colums of data
# Let data at row 1,column 1; row 2, column 2, correspond to d11, d22

#       col1 col2 ... coln
# row1  d11  d12  ... d1n
# row2  d21  d22  ... d2n
# .		 .    .   ...  .
# . 	 .    .   ...  .
# . 	 .    .   ...  .
# rown  dn1  dn2 ... dnn

# Syntax of 2d array in python:
# [[d11,d12,d13,..,d1n],[d21,d22,d23,.......,d2n]]

# Example: Following is the example for creating
# 2D array with 4 rows and 5 columns

array=[[23,45,43,23,45],[45,67,54,32,45],[89,90,87,65,44],[23,45,67,32,10]]

#display
print(array)


# Accessing the values using index position

# Syntax:
# 1)	Get row value using [] operator
#		i.e array[row index]
# 2) 	Get column value using [][]
#	    i.e array[row index][column index]
# where,
#	row index is the row position starts from 0
#	column index is the column position starts from 0 in a row.

# For instance:
# get the first row
print(array[0])

# get the third row
print(array[2])

#get the element at the first row and the third column
print(array[0][2])

# get the element (value) at the third row and forth column
print(array[2][3])

# Output:
# [[23, 45, 43, 23, 45], [45, 67, 54, 32, 45], [89, 90, 87, 65, 44], [23, 45, 67, 32, 10]]
# [23, 45, 43, 23, 45]
# [89, 90, 87, 65, 44]
# 43
# 65


# Inserting values into two-dimensional array using the insert() function
# Syntax:
# array.insert(index,[values])

# where,
#	the index is the row position to insert a particular row
# 	[values] are the values to be inserted into the array.
#	It must a list of values. It could be same length (5) as columns above 


# Example:
# insert 5 new data at the third row
array.insert(2, [1,2,3,4,5])

#insert another column of data at the 6th row
array.insert(5, [8,9,10,11,12])

#display
print(array)
Output:
[[23, 45, 43, 23, 45], [45, 67, 54, 32, 45], [1, 2, 3, 4, 5], [89, 90, 87, 65, 44], [23, 45, 67, 32, 10], [8,9,10,11,12]]

Popularity 10/10 Helpfulness 2/10 Language python

Source: www.guru99.com

Tags: 2d append arrays insert-into python row rows

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Contributed on May 27 2022

Mckynde

0 Answers Avg Quality 2/10

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Get columns of 2D array

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const arrayColumn = (arr, n) => arr.map(x => x[n]);

const twoDimensionalArray = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9],
];

console.log(arrayColumn(twoDimensionalArray, 0));
 Run code snippet

Popularity 8/10 Helpfulness 2/10 Language whatever

Source: stackoverflow.com

Tags: 2d get whatever whatev

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Contributed on Dec 07 2022

Aiman Tariq

0 Answers Avg Quality 2/10

Creates a 2D array with the number of rows and columns

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 let arr = []
  for(let i=0;i<size;i++)
  {
    arr[i] = []
    for(let j=0;j<size;j++)
    {
arr[i].push(j)
    }
  }
return arr;

Popularity 7/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: 2d rows whatever

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Contributed on Dec 29 2022

Ashwin Umbarkar

0 Answers Avg Quality 2/10

2d arrays with rows and columns

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2d arrays with rows and columns

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Get columns of 2D array

Creates a 2D array with the number of rows and columns

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