SystemOptions( arg1, arg2, ... )

SystemOptions

SystemOptions( reset )

For each argument of this type, SystemOptions returns the prior value of the variable.

The default value for the option cancellation, which determines whether pole-zero cancellation is applied to the transfer function of a system during creation.  If true, a pole-zero pair p, z, is cancelled (removed) if $\|p-z\|\le \max \left(\|p\|\,\|z\|\right)\cdot \mathrm{relativeerror}$. The default is false.

The color sequence used to draw plots with multiple colors. The default is the current list of colors from plots:-setcolors.

The complex frequency variable used to describe continuous systems as transfer functions. The default is s. See discretefreqvar.

The default value for the option conjugate, which determines whether the complex conjugates of complex roots of a ZPK model are automatically added during system creation. The default is false.

The default continuous-time variable used to describe continuous-time state-space and differential equation systems. The default is t. See discretetimevar.

The default value for the option decibels, which selects the units of gain. The value true selects decibels, the value false selects linear gain. The default is true.

The default value for the option discrete, which determines whether a system is discrete or continuous. The default is false.

The discrete complex frequency variable used to describe discrete systems as transfer functions. The default is z. See complexfreqvar.

The default discrete-time index variable used to describe discrete-time state-space and difference equation systems. The default is q. See continuoustimevar.

The default duration of the DynamicSystems[ResponsePlot] command. The default is 10.0.

The default value for the option hertz, which is used by the plot commands to select the unit of frequency. The value true selects hertz (cycles/second), the value false selects radians/second. The default is false.

The base name used to generate input variables. The generated names include appended integers. The default is u.

The method used by LinearAlgebra:-LinearSolve when computing a transfer function from a system matrix. The solve method is more efficient for some systems. The default is none.

The base name used to generate output variables. The generated names include appended integers. The default is y.

Specifies numeric values of parameters. Procedures that require numeric values, primarily plot and simulation routines, substitute the numeric value on the right side of each equation for the name on the left side in the model parameters. The default is the empty set.

The default value for the option radians, which selects the units for phase. The value true selects radians, the value false selects degrees. The default is false.

The default value for the option relativeerror, which is used by various procedures to determine how close roots must be to be considered equal. See the cancellation option, above. The default is $0.001$.

The default value for the option samplecount, which selects the number of samples of a discrete system. The default value is $10$.

The default value for the option sampletime, which is used to select the sample time (period) of discrete systems. The default is $1$.

The base name used to generate state variables. The generated symbols include appended integers. The default is x.

Return a sequence of all options and their values.

Return the value of the statevariable option.

Reassign statevariable, the global variable that denotes states of a system, and return its prior value.

Reset all options to their original values and return the sequence of names and values.