Difference betw Binary & Fortran Unformatted?
 

My cfd output file is in Fortran Unformatted PLOT3D format, I want to convert it to get PLOT3D Binary file? How should I do? Anyone can point out their difference?

Thank you

YRB

Re: Difference betw Binary & Fortran Unformatted?
 

If they are both of same Endian kind (big/little) and if I remenber well, it's just a matter of C. Return. Fortran ends each line with a CR.

Sylvain

Re: Difference betw Binary & Fortran Unformatted?
 

Hi,

For each single instruction write(), the binary fortran format (unformatted) include at the beginning and the end of the data block a word (4 bytes) giving the size of the data block. For instance :

write(10) k

write(10) ((a(i,j),i=1,2),j=1,3)

write(10) b,c

where each variable as a size of four bytes (integer and float)

will result in :

[4] [binary value for k] [4]

[24] 6*[binary value for a(.,.)] [24]

[8] [binary value for b] [binary value for c] [8]

with [] a four bytes block.

The existence of these blocks is the only difference between a binary format and the fortran unformatted format for PLOT3D.

Best regards

Re: Difference betw Binary & Fortran Unformatted?
 

Thanks a lot. What you pointed out is exactly the difference. I have fixed my format problem.

Ruobo