i want to count the frequency of occurrence of no 5 in the above vector .Is there any matlab function to count the frequency of occurrence of a particular number?

l=randi(10,1,20)

l =

Columns 1 through 9

    10     8     2     6     2     8     6     6     8

Columns 10 through 18

    10     9     5     2     4     5    10     7     9

Columns 19 through 20

     8     7

i want to count the frequency of occurrence of no 5 in the above vector .Is there any matlab function to count the frequency of occurrence of a particular number?

Answer 1

[Star Strider]

There are probably several ways of doing this, at least one involving the accumarray function. This one simply uses the hist function:

l=randi(10,1,20);                       % Data
Ul = unique(l);                         % Use For Bin Centres
[Cts, Ctrs] = hist(l, Ul);              % Find Counts For Each Bin
Cts5 = Cts(Ctrs == 5);                  % Get Counts For Bin Value = 5

Answer 2

[per isakson]

If the numbers are whole numbers and you want the "frequency" of one specific number then here is another way

    >> L = randi(10,1,24);
    >> sum( L==2 )/length(L)
    ans =
        0.2500

or maybe replace

    sum( L==2 )/length(L)

by

    sum( double( L==2 ) )/length(L)

btw: Lower case "L" is not a good name of a variable.