CODEWITHSUNDEEP
formatfortran
bspellacy
bspellacy

Reputation: 13

Reading files into fortran

So I'm writing some code in Fortran that multiplies a square matrix by itself. But the matrix I have to multiply is in a file and I'm having some issues reading it into the program. I think its because the sample data is in the following format:

3

101

010

101

The first row is the dimension of the matrix, and each row is a now in the matrix, but there aren't spaces in between the entries. So I guess my question is how do I split up those rows as I read them into a 2d array?

Upvotes: 1

Views: 360

Answers (2)

user2107289
user2107289

Reputation: 1

Read using format

read (1,*) n
allocate(A(n,n))
do i=1,n
  read (1,'(1000i1)'),A(i,:)
enddo

it does not matter whether you declare extra "i1" than actually needed

Upvotes: 0

M. S. B.
M. S. B.

Reputation: 29401

Read in the first number as N and use it to allocate an array of dimension N by N. Then read a row at a time of this array: array (i, 1:N)) for i=1 to N. See Fortran: reading a row of numbers into an array for the format to use.

Upvotes: 1

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