Finding Probability of a digit in a data set

Ok, so I uploaded a data set using textscan:

fileID=fopen('filename');

if fileID < 3
    disp('Error: file couldn''t be opened.')
else
    C = textscan(fileID,'%f %f %f %f')
end

and I get a result,

C = 

      [3660x1 double]    [3660x1 double]    [3660x1 double]    [3660x1 double]

in each column, there are a bunch of decimal numbers. What I want to do, not including the first column, is find the probability of the numbers 0-9, and a decimal point.

So if one of my columns is

C{2}=
1 
1.0021
1.23
2.3
4.5

and so on, I want to find the probability of each individual digit occurring, not the probability of 1.23 occurring, but the probability of a 1,2,3,4,5,'.' occurring.

These probabilities will later be used to encode my data set using huffman.