Reading unknown size matrix to Fortran

Asked Feb 07 '19 at 05:19

Active Feb 07 '19 at 07:14

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I was wondering how I can read a matrix in a file to Fortran 90 in case dimension of matrix is not known. I know how to get the number of rows for the matrix but have no idea how should know column number to allocate a matrix inside program. lets say matrix is like this

1 2 3 4 50
2 50 2 50 1
21 3 15 515 7

I got this for getting number of rows of external file:

! GETTING NUMBER OF ROWS
open(unit=11, file=esmfile)
n=0
DO
  READ(11, *, IOSTAT=iostatus) dummy
  IF (iostatus < 0) EXIT
   n = n + 1
END DO

edited Feb 07 '19 at 07:14

Vladimir F Героям слава

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asked Feb 07 '19 at 05:19

Alam_jorab

What format is the file in? – P Varga Feb 07 '19 at 05:35
I added a matrix as an example. – Alam_jorab Feb 07 '19 at 06:10
Please use tag [tag:forttan] for all Fortran questions. Related: https://stackoverflow.com/questions/7314216/reading-data-file-in-fortran-with-known-number-of-lines-but-unknown-number-of-en there is likely to be a closer one somewhere. – Vladimir F Героям слава Feb 07 '19 at 07:18
Naturally, if you believe it's a well structured file, you need do the column count determination once only. – francescalus Feb 07 '19 at 07:26

Reading unknown size matrix to Fortran

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