FORTRAN Problem Runtime Error: End of File

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SUMMARY

The forum discussion addresses a runtime error in FORTRAN, specifically the "End of File" error encountered while using gfortran on Ubuntu. The user resolved the issue by removing the variable 'z' from the read statement in their code. The program is intended to read data from an input file, count values within a specified interval, and write the results to an output file for histogram creation. The user seeks further assistance in writing all required data to the new file.

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karenmarie3
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FORTRAN Problem! "Runtime Error: End of File"

Hey everyone, back again with another Fortran question.

I am getting the runtime error in Fortran "End of Line". I have tried to simply understand what this means, but I am not getting much help from Google.

I have pasted my code below, and highlighted the line that I understand the error exists. (in my terminal window, it's line 32) I am currently working on the latest distro of Ubuntu, and I am compiling with gfortran.

Could someone please assist me in correcting my error, as well as explain to me what this error means, so that I unserstand what to look for in the future? Also, if anyone knows of a good debugging tutorial or website that would be greatly appreciated as well.

This code is designed to read from an input file (x for now, eventually y as well) and count the number of values on an interval then write this data in another file so that I can create a histogram of the data.

If you need further clarification, please let me know.

Thanks in advance!


program histogram

implicit none

integer x_min, x_next, a, N, M
integer y_min, y_next , b, i, j
real x, y, z

real, dimension(4500, 4500, 4500, 4500) :: histo1
integer, dimension(4500, 4500, 4500, 4500) :: histo2

open(unit=2, file="xz.dat", action="read", status="old")
! open(unit=3, file="yz.dat", action="read"' status="old")
open(unit=7, file="xa.dat", action="write"' status="unknown")
! open(unit=8, file="yb.dat", action="write"' status="unknown")


x_min = -13

! y_min = -13

M = 13

N = 4209

do i = -13, M

do j = 1, N

read(2,*) x, z

! read(3,*) y, z

if (x .lt. (x_min + 1)) then

a = a + 1

! if (y .lt. (x_min + 1)) then

! b = b + 1

end if

end do


if (x .lt. (x_min + 1)) then

x_min = x_next

! if (y .lt. (y_min + 1)) then

! y_min = y_next

end if

end do


write(7,*) x, a

! write(8,*) y, b


close(2)
! close(3)
close(7)
! close(8)
stop
end program
 
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Ok so I solved my runtime error by removing the 'z' in the read line. Now I just need to get the program to write all the data I require to my new file. I'll come back if I have issues with this.
 
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