read_table does not seem to search for files in "ampl_include" paths

[Cuong P. Nguyen]

I have defined paths to source code folder (where all *.mod files are located), and data folder (where all *.tab files are located, including mydata.tab file below)

option ampl_include 'C:\ampl_source_foler \
                     C:\ampl_data_foler';

 

then I was trying to load mydata.tab file, but it showed an error below. There was however no error in loading this table if I CD to the C:\ampl_data_foler path before executing the two commands below.

 

table mydata: [id], dat1, dat2;
read table mydata;

Error at _cmdno 13 executing "read_table" command:

 Error reading table mydata with table handler tab:

 Cannot open "mydata.tab".

 

[Victor Zverovich]

According to the AMPL book, ampl_include is used for include and similar statements rather than read data:

For include phrases as well as model, data, and commands commands, files with simple names, e.g., not involving a slash (/), are sought in directories (folders) specified by option ampl_include.

But you can specify the path to the .tab file in the table declaration:

  table mydata 'path/to/mydata.tab': [id], dat1, dat2;

or use a parameter if the path is used more than once:

  param data_path symbolic = 'path/to/data';
  table mydata (data_path & '/mydata.tab'): [id], dat1, dat2;

HTH,
Victor

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[Cuong Nguyen]

Thank you Victor 

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