Special features of "born"
You may also want to look at the full parameter list of all the buttons and sliders, or at one of the general help files, Sliders, or
Graphs.
- Key equivalents:
- run/stop: = spacebar.
- initialize = i key.
- Entry disputes: The wave vector slider will sometimes change the value you attempt to type in. Don't be offended. This will occur if the initial conditions are traveling wave or standing wave. The program forces values of wave vector which are consistent with the chosen boundary conditions (even though you may be pretending to see a wave on an infinite chain).
- Speed: The speed slider has no influence on the numerical calculation or the time readout. It determines the number of calculational steps between successive animation frames. One data set for the graph is taken for each frame, so that increasing the speed reduces the time resolution available in the graph as well as speeding the display.
- Memory Data for the graph can eat a lot of memory. To conserve memory in long runs, run at high speed over most of the run, and run at low speed only at those times where you want good time resolution in the graph.
- Stability Because of the fixed time step used by "born", the program becomes unstable for light impurity masses and strong anharmonicity. Sliders have been restricted to reduce the danger, but crashes are possible.