How to perform a calculation and how to get started

Create an input file, e.g. problem.dat. The default input file is tn.dat, which will be used if no other input file is specified. Thus the command tochog or tochnog tn.dat yields output on the screen while tochnog tn.dat $>$ tn.out redirects the output to a file. On a Unix system you can run the job in the background with tochnog tn.dat $>$ tn.out &. On a Microsoft windows system you need to run from a Dos shell.

Use the condif1.dat test to get started.

• Copy condif1.dat to tn.dat.
• Use your favorite editor to open the file tn.dat and study it.
• Change echo to -yes.
• Remove the parentheses (...) surrounding the control_print statement and save the file.
• Run by typing tochnog or tochnog tn or tochnog tn.dat.
• Study the output on the screen.
• Study the tn.log file.
• Study the tn.dbs file. It contains the database after the calculation, and is an input file itself!

Afterwards do the same for the test repeat1.dat. It is simple, but shows some of the advanced features of TOCHNOG. Finally look at the test repeat2.dat. After that you understand much of the program.

Finally, read at least once the start of the data part section.