Hi experts,

I have two arrays of data, called data1.dat and data2.dat. each contains 60 data. What I want to do is to compare the data in each file and write the counting into bins. It goes like this. First, take the first data in data1.dat file and compare with the 60 data in data2.dat file. If there is any data which is same with the data in data1.dat then it count in bin. The total bins are also 60. Next it goes to the second data in data1.dat and compare with all the 60 data in data2.dat. If there is any data same then it add in second bin. And it repeats to all the data in data1.dat

I am not very sure how to write this code.

Can anyone help me?

Thank you in advance.

Vijay

Sounds like a job for a "for loop"

Have you tried this? How far did you get? Any problems/questions? Can you post any code?

Inquiring minds want to know

Any reason why you want to do it in fortran? Seems a bit overkill for a trivial problem.

To compare arrays you might subtract them and check if the difference is /= 0. Using masks (take a look at the WHERE statement) you can easily count elements and store the results in an integer array of the same length.

As previously stated, it would be far more easy to help by seeing what have you tried so far. Moreover, we could have an idea of your fortran skills.

I think using WHERE works better in fortran 90, if you don't want to compile your codes on a CRAY machine. In line with element by element comparison I suggest using:

(suppose you want to compare elements of A(g,m) and B(g,m)...)
(specifically I compare column "k" of A with column "t" of B)

check = 0

DO i = 1,g

if (A(i,k) /= A(i,t)) then
check = check + 1
EXIT
end if

END DO

then you can make use of check later. having changed check from 0 to 1 we can conclude matrix columns are not equal.

Its a lengthy line but it worked.

Good luck,