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POReading a known number of variable from a file when one of the variables are missing in input file
 

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  1. POReading a known number of variable from a file when one of the variables are missing in input file
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    <p>I already checked similar posting. The solution is given by M. S. B. here <a href="https://stackoverflow.com/questions/7314216/reading-data-file-in-fortran-with-known-number-of-lines-but-unknown-number-of-en/7315185">Reading data file in Fortran with known number of lines but unknown number of entries in each line</a></p> <p>So, the problem I am having is that from text file I am trying to read inputs. In one line there is supposed to be 3 variables. But sometimes the input file may have 2 variables. In that case I need to make the last variable zero. I tried using READ statement with IOSTAT but if there is only two values it goes to the next line and reads the next available value. I need to make it stop in the 1st line after reading 2 values when there is no 3rd value.</p> <p>I found one way to do that is to have a comment/other than the type I am trying to read (in this case I am reading float while a comment is a char) which makes a IOSTAT>0 and I can use that as a check. But if in some cases I may not have that comment. I want to make sure it works even than. </p> <p>Part of the code </p> <pre><code> read(15,*) x read(15,*,IOSTAT=ioerr) y,z,w if (ioerr.gt.0) then write(*,*)'No value was found' w=0.0; goto 409 elseif (ioerr.eq.0) then write(*,*)'Value found', w endif 409 read(15,*) a,b read(15,*) c,d </code></pre> <p>INPUT FILE is of the form</p> <pre><code> -1.000 abcd 12.460 28.000 8.00 efg 5.000 5.000 hijk 20.000 21.000 lmno </code></pre> <p>I need to make it work even when there is no "8.00 efg"</p> <p>for this case</p> <pre><code> -1.000 abcd 12.460 28.000 5.000 5.000 hijk 20.000 21.000 lmno </code></pre> <p>I can not use the string method suggested by MSB. Is there any other way? </p>
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    1. USjonayat
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    1. COAnother idea, not mentioned yet, is to preprocess your input file with a script written in a language that is more suited for this sort of task (python, perl and even awk come to mind) ... It seems like that approach would be more simple and more powerful.
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      1. USmgilson
    2. COThats a perfect suggestion. However, I am working on a code that was written 20 years ago, can not change the input file format at this time.
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      1. USjonayat
    3. COI'm not suggesting you change the (expected) format of the input file, only use a script to beat the original poorly formatted file into something that complies with what your code (written 20 years ago) wants.
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