2 Running Bil

Bil can be run non-interactively only. To compute the solution of a problem described in the input data file my_file, type:

bil [options] my_file

The input data file format is described in the following section. Without any option, running Bil will create the output files my_file.pi and my_file.ti (see Output files). If there is no input data file named my_file, Bil will open this file in writing mode and will ask the user for the input data. With the option -h (help) there is no input data file to give. The command

bil

(alone) displays the available options.

The way Bil will run may depend whether there are some other files (see Other files). The most important of them, namely my_file.graph.iperm, defines the way nodes are renumbered so as to optimize the resolution algorithm. Except in 1D problems, it is very important, if not essential, to create this file with an aquedate option, e.g. -iperm, (see Bil options).