Invalid number: incomprehensible list input ERROR

[a.marin]

"invalid number: incomprehensible list input" ERROR

Hello, I'm beginning to code in FORTRAN 77 so be patient please.

I'm trying to read a plain text file (*.txt) which has 6000+ rows and 56 columns, this is the code I've been written so far:

      program segmente
      implicit real*8 (a-h,o-y)

      parameter (Ndat=300000, nca=56)
      parameter (length=2000, kshift=1000)

      dimension daten(Ndat,nca)

      character*1 b1,b2,b3,s1,s2,s3

      open(unit=1,file='LV_Sz1_data.txt',status='old')

      do nt=1,ndat
        read(1,*) dummy,(daten(nt,nc),nc=1,nca)
      enddo

      kens=(Ndat-length)/kshift+1

      do k=1,kens
        write(*,*) 'Segment ',k

	a1=int(k/100)
	a2=int((k-a1*(100))/10)
	a3=int(k-a1*(100)-a2*(10))
	a7=a1+48
	a8=a2+48
	a9=a3+48
	b1=char(int(a7))
        b2=char(int(a8))
        b3=char(int(a9))

        ki=(k-1)*(length-kshift)+1
        kf=ki+length-1

        open(51,file=
     &'INTRA_SEG/IC56/Seg'//b1//b2//b3,status='unknown')
        do kt=ki,kf
          write(51,'(99E16.6)') (daten(kt,nc),nc=1,nca)
        enddo
        close(51)
      enddo

C
      END

When I compile this code nothing wrong happens, but when I try to run it appears the following errors:

invalid number: incomprehensible list input
apparent state: unit 1 named LV_Sz1_data.txt
last format: list io
lately reading direct formatted external IO
Aborted

So, What I'm doing wrong here?

Thanks in advance.

A. Marin.

 

[HallsofIvy]

That probably means that the format of the input is not what you have told the computer to expect.

 

[quicknote]

Hello A. Marin,

Thank you for sharing your code and the errors you are encountering. Based on the code and the errors, it seems like there may be an issue with the way the data is being read from the text file. The error "invalid number: incomprehensible list input" suggests that the code is encountering a value in the text file that it cannot interpret or convert into a number. This could be due to a formatting issue in the text file, such as a missing or extra space, or a non-numeric character. I would suggest double checking the formatting of your text file and making sure it matches the format specified in your code. It may also be helpful to use a debugging tool or print statements to identify the specific line or value that is causing the error. I hope this helps, and good luck with your coding!