Various parameters of the simulations available in Ngspice can be altered to control the accuracy, speed, or default values for some devices. These parameters may be changed via the option command (described in Chapt. 17.5.47) or via the .options line:

General form:

.options opt1 opt2 ... (or opt=optval ...)

Examples:

.options reltol=.005 trtol=8

The options line allows the user to reset program control and user options for specific simulation purposes. Options specified to Ngspice via the option command (see Chapt. ) are also passed on as if specified on a .options line. Any combination of the following options may be included, in any order. `x' (below) represents some positive number.