File I/O, Arrays, and Databases in Revolution

Zac Elston zelston at aol.com
Thu Mar 28 13:31:01 CST 2002


one month later and now I can answer questions!!!!

> fields, scientific notation fields, etc.  In looking at the Revolution
> documentation, it appears that I have to somehow read or write each line
> as a string, then somehow parse each field from this string.  So how do
> you do this efficiently in Revolution?   Please note that the files
> created by the FORTRAN programs are fairly large.
>

open file filename for read
read from file until EOF
put it into DaFile
close file Filename

now DaFile is a copy of the contents of Filename and you can use string and
line manipulation on the variable DaFile


> The next question is how are arrays implemented in Revolution?. I've
> searched the documentation but haven't found anything.  What I'd like to
> do is read in the FORTRAN files, putting the data into Revolution arrays
> for display or calculational analysis.  How can this be done?
>
reading lines MUST occur with a variable, it doens't seem to work with files
just guessing here....

so
put line X of DaFile into MyLine
--make MyLine an array
--research the "split" command, arrays are not very well documented in the
help text.
split MyLine with somedelimiter
--get the keys of the array for later
put the keys of MyLine into MyKeys

now you have an array and the keys

> Finally, I tam interested in the database capabilities of Revolution
> (especially the Valentina engine).  I'd like to read in the data from
> the FORTRAN files and directly put them into a database so that
> information can be searched, manipulated, calculated. etc.  How can this
> be done?

can't help here, just about to try it myself...

-zac




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