How to find 'numbers' of unique variable in matrix. How many quantity of variables.

x=[2 5 2 52 5 25 2 5 2 22 5 2 5 52 5 55 4 5 5 2 5 5 25 2 5 2 54 5 54 5 2 5 5 5 5 5 5 5 25 2 255 2 5 5 2 55 2 5 5 2 5 5 2 255 2 52 5 2 5 ];

unique(x)

ans =

Columns 1 through 6

     2     4     5    22    25    52

Columns 7 through 9

    54    55   255

How to find numbers using command. How many numbers of unique variable.

Answer 1

[Konstantinos Sofos]

Hi,

To reformulate your question (as I understood it) you would like to be able to return the count of occurrences of each element in a vector. There are multiple ways to do this. One solution would be by using hist and unique functions

x=[2 5 2 52 5 25 2 5 2 22 5 2 5 52 5 55 4 5 5 2 5 5 25 2 5 2 54 5 54 5 2 5 5 5 5 5 5 5 25 2 255 2 5 5 2 55 2 5 5 2 5 5 2 255 2 52 5 2 5 ];

>> [a,b]=hist(x,unique(x))

a =

      17     1    28     1     3     3     2     2     2

b =

       2     4     5    22    25    52    54    55   255

where a(i) is the (count) of b(i).