Question

Using the following 2D array:

34    38    50    44    39
42    36    40    43    44
24    31    46    40    45
43    47    35    31    26
37    28    20    36    50

Sort the rows of the array based on first element of the row (i.e. rearrange the rows so that the first column's value determines the sort of the grid's rows). (this is for python coding)

Answer 1

'''

Python version : 2.7

Python program to sort the rows of the array based on first element of the row

(i.e. rearrange the rows so that the first column's value determines the sort of the grid's rows)

'''

# create the array

array = [[34,38,50,44,39],[42,36,40,43,44],[24,31,46,40,45],[43,47,35,31,26],[37,28,20,36,50]]

#print the original array

print('Original array : ')

for data in array:

               print(data)          

# sort the rows of the array based on first element of the row

for i in range(len(array)):

              

               min = i

              

               for j in range(i+1,len(array)):

                             

                              if (array[j][0] < array[min][0]):

                                             min = j

                                            

               if i != min:

                              array[i],array[min] = array[min], array[i]

#print the sorted array

print('Sorted array : ')                    

for data in array:

               print(data)                         

              

#end of program             

Code Screenshot:

Output: