How to tag output of function which is a vector in a new array/matrix in increasing order?

I have an output of a function which is a vector:

a   = [ 4 3 8 27 10]

These are all the indices. My function runs for about 100k files. Everytime I get a new set of indices as a. What I intend to do is tag these indices in a separate array/ matrix. So,

a = [4 3 8 27 10]

should be tagged as [1 1 1 1 1] in the new array/ matrix. Then for next set of

a = [ 25 17 89 11]

should be tagged as [ 2 2 2 2 ] and so on.So basically I want them to be in increasing order. Is there a solution to this? Thanks much in advance.

[Sean de Wolski]

huh?

[Sim]

Say I already have a pre-defined list

    list = [1
            2 
            3 
            4 
            5 
            6 
            7 
            .
            .
            .
            .

So whenever I get an output from 'a' I would like to tag them in this list. For example,

a = [4 6]

list = [ 1 
         2
         3
         4  1
         5
         6  1
         7]

next time if

a= [ 1 2]

List should be updated to

list = [ 1  2
         2  2
         3 
         4  1
         5 
         6  1 
         7 ]

If there is nothin the values could be Nan as I will predefine List with NaN. Does this make sense? I just have an idea but I do not know how to go forward with it.

Answer 1

[Matt Fig]

A{1} = [ 4 3 8 27 10];
A{2} = [4 3 8 27 10];
%  etc...

Then later you can examine them:

A{2}

.

.

.

.

.

EDIT

Wow! What a difference a thorough description (found in the comments above) makes.

list = [(1:10).' zeros(10,1)];
A = [2 3 4 3 4 1 9 8 7]  % given vector
I = unique(A);
J = histc(A,I);
list(I,2) = list(I,2) + J.' % Add them to the counts.

Now say we get another A, just do it again:

A = [4 2 3 2 6 7 8 9];
I = unique(A);
J = histc(A,I);
list(I,2) = list(I,2) + J.' % Add them to the counts.

[Sim]

I am getting an error for the '+' command. I am trying to populate a list/matrix with the output of the function. The output of the function are the indices of the matrix. So suppose if the output of funtion is [6 10] I want it to go back to the matrix and just append 1 1 for the row of 6 and 10.