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Jim
Joined: 21 Jul 2006
Posts: 24
Location: USA
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 Posted: Mon Jan 31, 2011 1:48 pm Post subject: Read and Write Statements (I/O). |
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Can someone assist me with opening a file and reading data from same? I am using the following read statement and compiling with FTN95 but I am not successful in reading the data.
READ(5,101) NUMNP,NUMEL,NEN,NTIM
101 FORMAT(5I5)
If someone has examples of OPEN, READ and WRITE statements that I could modify for my use, please post for me.
Thanks!
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Wilfried Linder
Joined: 14 Nov 2007
Posts: 314
Location: D�sseldorf, Germany
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| Posted: Mon Jan 31, 2011 1:57 pm Post subject: |
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You want to read 4 values but you define 5 in the format statement.
Try format(4I5). |
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LitusSaxonicum
Joined: 23 Aug 2005
Posts: 2402
Location: Yateley, Hants, UK
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| Posted: Mon Jan 31, 2011 3:55 pm Post subject: |
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Jim,
Unit 5 is one of the traditional numbers that meant "card reader" and later "console". You would be better off with a bigger number, especially reading from a file. (0, 1, 5 and 6 are likely to be dodgy!).
Before you can read from a file, you need an OPEN statement. How about:
| Code: | | OPEN (UNIT=25, FILE='DATAFILE.DAT',STATUS='OLD') |
Then, you can read more or less as you wrote. I wouldn't worry about having 5I5 instead of 4I5. You don't even need a FORMAT on input especially, just so long as the numbers are separated by blanks or commas.
| Code: | | READ(25,*) NUMNP, NUMEL, NEN, NTIM |
It looks very much as though you are beginning a time-stepping finite element program here - lots of people on the forum are into FE!
In the OPEN statement you can have a whole bunch of other stuff dealing with (for example) what you do if the file can't be opened etc.
If you get round to using Clearwin+, you will be able to use the Windows interface to give your users a standard way of selecting files.
Eddie |
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IanLambley
Joined: 17 Dec 2006
Posts: 506
Location: Sunderland
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| Posted: Tue Feb 01, 2011 1:35 pm Post subject: |
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If you use a 4I5 format for inputting 4 integer variables, then really these should be spaced as such in the input file and right justified within each field otherwise you get strange results. For example:
| Code: |
IIIIiiiiIIIIiiii
3 3 3 3
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will give the four values as 3, 30, 3030, 0
There are at least two things you can do:
1. Put a coma between each input value and avoid trailing spaces.
2. Do as Eddie says and use *, and then it does not matter what type of variable you are reading, but for character values, enclose them in apostrophes.
Regards
Ian |
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LitusSaxonicum
Joined: 23 Aug 2005
Posts: 2402
Location: Yateley, Hants, UK
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| Posted: Tue Feb 01, 2011 7:27 pm Post subject: |
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Ian,
You've done 4I4, or do my eyes deceive me? Those fixed formats are hell on input!
Eddie |
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