# IMAGE PROCESSING

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### Array sorting in MATLAB

Sorting an array and retrieving the minimum and maximum values with the index may seem simpler but this helped me in many ways especially when working with arrays. So this is just a refresh on how to sort a 1 and 2d arrays.

Single dimensional array sorting

To sort the array and display the position (index):

A = [5 8 9 10 100 7 50 8 88 6;];

Before sorting:
A =   5     8     9    10   100     7    50     8    88     6

[sorted_array,pos]= sort(A)

After sorting: Here the sorted array and the array position of each value will be displayed.
By default, sorting type is ‘ascending’.

sorted_array =     5     6     7     8     8     9    10    50    88   100

pos =     1    10     6     2     8     3     4     7     9     5

To find the maximum value:
A =   5     8     9    10   100     7    50     8    88     6

[max_value,max_pos]=max(A)

max_value  =    100

max_pos  =      5

To find the minimum value:

A =   5     8     9    10   100     7    50     8    88     6

[min_value,min_pos]=min(A)

min_value =      5

min_pos =      1

Two dimensional array sorting:

B=[17 5 8 9; 45 23 50 6; 7 49 21 11]

Before sorting:

B =     17     5     8     9
45    23    50     6
7    49    21    11

[sorted_array, pos]=sort(B(:))

After sorting:

sorted_array =

5
6
7
8
9
11
17
21
23
45
49
50

pos =

4
11
3
7
10
12
1
9
5
2
6
8

Maximum value:
[sorted_array, pos]=max(B(:))

sorted_array =

50

pos =

8

Minimum Value:
[sorted_array, pos]=min(B(:))

sorted_array =

5

pos =

4

To retrieve the minimum value: B(4)
ans =      5
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