Re: Fortran 77: read second number on a line in a comma delimited text file
- From: GaryScott <garylscott@xxxxxxxxxxxxx>
- Date: Mon, 9 Feb 2009 12:28:45 -0800 (PST)
On Feb 9, 11:41 am, dpb <n...@xxxxxxx> wrote:
kilter wrote:
...> Is there a way to use format directed input in fortran 77 to read the
second number of each line in a comma delimited text file (.csv file)
...
A more general musing after the previous response of a specific FORMAT
solution that has many limitations...
I suppose the idea of an "elegant" solution would be a FORMAT positional
specifier that is context-sensitive (for lack of better phraseology that
comes to mind at the moment) that would allow for skipping a
variable-width field.
Matlab (ML) has such a feature in some of its text input functions. ML
uses a (vectorized) form of the C printf() format descriptors. In the
function such as textread() which has quite a few options for handling
variously formatted text files, using %* instead of % in a conversion
causes textread() to skip the matching characters in the input and no
output is created for this conversion. It also has a selectable field
delimiter character, so a csv file can be parsed by column in a single call.
Of course, all of this is implemented in a fairly complex routine that
does all the parsing of the input file so underneath the surface the
duck is paddling furiously although it looks quite serene from shore.
--
There once was a proposal for options csv file reading in F2k8...I
think maybe it went away.
.
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