counting elements in an array

Hello All

I have an array of 20,000 different numbers. I do not know which numbers are in this array and how many times they are present. I want to know how many times each number is present in this array. So i want the result in a form like this (this is an example). I know the i can use find function to access the index of each element and then length function to count how many times one number is present. But the problem is i have 20,000 values and it is very difficult and lenghty to use find and length function for each value.

Is there any matlab function for counting each element in the array of 20000 numbers

Number No of times each number is present in the array

1.3

Also which function i can use for plotting

Thanks in advance Start a New Thread

Hi Ayyaz,

If X is the array of elements, do:

Y = sort(X);
N = histc(X,Y);
Y(N==0) = [];
N(N==0) = [];

Then, N(i) is the number of occurences of element
Y(i). At this stage, Y is the sorted version of unique
elements in X.

For plotting use, hist(X,Y).

Amit
--- ayyaz mahmood wrote:

> Hello All
>
> I have an array of 20,000 different numbers. I do
> not know which numbers are in this array and how
> many times they are present. I want to know how many
> times each number is present in this array. So i
> want the result in a form like this (this is an
> example). I know the i can use find function to
> access the index of each element and then length
> function to count how many times one number is
> present. But the problem is i have 20,000 values and
> it is very difficult and lenghty to use find and
> length function for each value.
>
> Is there any matlab function for counting each
> element in the array of 20000 numbers
>
> Number No of times each number is present
> in the array
>
> 1.3
>
>
> Also which function i can use for plotting
>
> Thanks in advance
>
> Start a New Thread