Read filenames in a directory

[ivanova...@gmail.com]

Dear smart people,

I need to read data from  uniformatted text files in one folder.

Every time I load data from one text file, I need to solve a model with the data.

The text files in the folder have inconsistent names, say

file1.txt

hypercube43

input.txt

...

I would like to somehow load the filenames into a set of strings, and process them by iterating over this set of strings.

Is there a way how to do it?

Thanks a lot in advance,

Marika

[AMPL Google Group]

Here's a simple example:

set filenames = {"file1.txt","hypercube43","input.txt"};

param n integer > 0;
param a {1..n} >= 0;

for {f in filenames} {
   reset data;
   read n <(f);
   read {j in 1..n} a[j] <(f);
   display a;
}

If the filenames are going to change frequently, then instead of giving their names in the model, you could read the members of set "filenames" from a file, too -- either in AMPL text file format (using "data") or unformatted text (using "read").

(If every file contains the same number of data values, then for this example you don't need the "reset data;" and "read n <(f);" inside the loop.)

--
Robert Fourer
am...@googlegroups.com

{#HS:1318256689-91458#}

[ivanova...@gmail.com]

Thank you very much. The files are changing all the time and also there are many of them (~1000). But the idea of loading the fienames into another file and then reading from it didn't cross my mind.