Need Help with Writing Fortran95 Procedure

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SUMMARY

The discussion centers on writing a Fortran95 procedure to read data from seven input files, perform calculations, and write the results to a single output file. Users suggest initializing arrays to store data, opening all files, using a "DO" loop for data reading, and closing the files afterward. The conversation highlights the importance of correctly managing file operations and data structures in Fortran95 programming.

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  • Fortran95 programming language
  • File I/O operations in Fortran95
  • Understanding of arrays in Fortran95
  • Basic control structures, specifically "DO" loops
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This discussion is beneficial for novice Fortran95 programmers, data analysts working with Fortran, and anyone looking to improve their skills in file handling and data processing within the Fortran environment.

anna2011
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Fortran95 HELP!

Hi everyone,

I have problem with writing a procedure in Fortran. I'm a newbie so any help will be appreciated.
So the problem is as follow: I have written a program which reads some data from input file and then calculates some stuff using read values. Now what i have to do is to open more then just one file (seven actually) which have the same format as the previous one, the same extention but different names and the text string is not composed of the same number of letters, just the same extension. When i open all the files then i have to use the procedure i wrote and write all the data in one file.
Can anyone tell me how I can do that, I'm getting crazy becuase of that...

Thanks, in advance
 
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I think opening and writing is done as follows
Forgive me if I misunderstand your question

open(1,file='file1')
open(2,file='file2')
...
open(7,file='file7')

write(1) variable1
write(2) variable2
...
write(7) variable7

close(1,2,3,4,5,6,7)
 
Last edited:


Hi,
Thanks for quick reply.
So the idea is to read seven files, one by one, read from those files needed values and use the same procedure to calculate some values based on data read from each input file. And then in output file i should have seven separate blocks of calculations, for each input file.

Is this makes things more clear?
 


anna2011 said:
Hi,
Thanks for quick reply.
So the idea is to read seven files, one by one, read from those files needed values and use the same procedure to calculate some values based on data read from each input file. And then in output file i should have seven separate blocks of calculations, for each input file.

Is this makes things more clear?

Hi anna :smile: I am new to FORTRAN as well, but I think you need to do something like this:

1) Initialize some arrays to store the data in
2) Open all of the files
3) Use a "DO" loop to read all of the data into the arrays
4) Close all files

We can help you out, but it would be helpful if you could provide a short sample of one of the 7 files you wish to get data from. Just copy paste the first 5-6 rows of data from a file and wrap them in the "Code" tags located above by using the [URL]http://i12.photobucket.com/albums/a220/saladsamurai/codetags.jpg[/URL] button (this will preserve the formatting).
 
Last edited by a moderator:


Code:
C1        2.1419561858E+00  2.1419561858E+00  4.2839123717E+00  0.0000000000E+00
O2        4.5849316264E+00  4.5849316264E+00  9.1698632528E+00  0.0000000000E+00
N3        4.0198698574E+00  4.0198698574E+00  8.0397397149E+00  0.0000000000E+00
H4        3.0070127032E-01  3.0070127032E-01  6.0140254064E-01  0.0000000000E+00
H5        3.1607842405E-01  3.1607842405E-01  6.3215684811E-01  0.0000000000E+00
N6        4.0198675021E+00  4.0198675021E+00  8.0397350042E+00  0.0000000000E+00
H7        3.0070127037E-01  3.0070127037E-01  6.0140254074E-01  0.0000000000E+00
H8        3.1606930741E-01  3.1606930741E-01  6.3213861481E-01  0.0000000000E+00

hope its enough.

Thanks a lot :)))
 


anna2011 said:
Code:
C1        2.1419561858E+00  2.1419561858E+00  4.2839123717E+00  0.0000000000E+00
O2        4.5849316264E+00  4.5849316264E+00  9.1698632528E+00  0.0000000000E+00
N3        4.0198698574E+00  4.0198698574E+00  8.0397397149E+00  0.0000000000E+00
H4        3.0070127032E-01  3.0070127032E-01  6.0140254064E-01  0.0000000000E+00
H5        3.1607842405E-01  3.1607842405E-01  6.3215684811E-01  0.0000000000E+00
N6        4.0198675021E+00  4.0198675021E+00  8.0397350042E+00  0.0000000000E+00
H7        3.0070127037E-01  3.0070127037E-01  6.0140254074E-01  0.0000000000E+00
H8        3.1606930741E-01  3.1606930741E-01  6.3213861481E-01  0.0000000000E+00

hope its enough.

Thanks a lot :)))
Hmm I'm afraid it's not enough. Could you explain what are those values for your program? These are the written values, the read ones?
Also they are weird (but might be right). For each molecule (or row I'd better say), the first column is equal to the second. And the 3rd column is worth 2 times the first. The last is always 0.

Sybren said:
I think opening and writing is done as follows
Forgive me if I misunderstand your question

open(1,file='file1')
open(2,file='file2')
...
open(7,file='file7')

write(1) variable1
write(2) variable2
...
write(7) variable7

close(1,2,3,4,5,6,7)
You forgot to read the files and do some calculations :)
 

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