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Error: Expected variable in READ statement at (1) but with declared variables

This question seems to be related to Error: Expected variable in READ statement at (1) but it is not the same, since I have declared the variables.

program read_matrix
  integer :: m(3,3),n(3), i, j


  open(1001, file='data1.txt')
  do i = 1, 3
    read(1001,*) (m(i,j), (j=1,3))
  end do

end program read_matrix

data1.txt is

1 2 3
4 5 6
7 8 9
10

I used gfortran to compile the above fortran code, and got

read-1.f90:7.16:

    read(1001,*) (m(i,j), (j=1,3))
                1
Error: Expected variable in READ statement at (1)

Hence, I am wondering what is the reason for it. Thanks.

Solution

  • Your implied-do loop is wrong. Look at the parentheses. Here what you want

    read(1001,*) (m(i,j), j=1, 3)