I have a data file with 21 values in it, which range from 2 to 10 by integers values. I would like to know whether it's possible to write a Fortran code to count the number of times a particular value (for instance "6") appear in the file. Let's call x_i the number of times the value i appears in the data file. Eventually I would like to write in a new text file the following: Code (Text): i=0 do while (i.le.21) write (11,*)i, x_i i=i+1 end do So when I plot into gnuplot the data of the file 11, I can check out immediatly whether the data distribution looks like a Gaussian. I took a numerical analysis course a few years ago, but from what I remember I don't see anything that could help me here. Do you have any idea? Thanks.