The signal processing packages introduce new objects to create plots
that follow engineering convention.
One- and two-dimensional sequences are displayed in ``lollipop'' style
[Oppenheim and Schafer] via <#618#>SequencePlot<#618#>, whereas <#619#>SignalPlot<#619#>
graphs one- and two-dimensional continuous signals.
Both <#620#>SignalPlot<#620#> and <#621#>SequencePlot<#621#> support the same options
as does the standard plotting function <#622#>Plot<#622#>.
<#623#>PoleZeroPlot<#623#> displays pole-zero diagrams for one- and two-dimensional
transfer functions.
This function supports only one option <#624#>Dialogue<#624#> which if
<#625#>True<#625#> or <#626#>All<#626#> forces the printing of the values of the
poles and zeroes before they are plotted.
<#627#>RootLocus<#627#> and <#628#>MagPhasePlot<#628#> generate root locus plots
and plot magnitude/phase responses, respectively.
<#629#>MagPhasePlot<#629#> displays continuous-time as well as
discrete-time Fourier transforms as long as the options are set properly.
The default options are biased toward DTFT's:
94, 95,
96, 97, and
98.
For CTFT's, 99 option should be set to 100
and the 101 should also be set to 102 which
would give the familiar Bode diagram.
These routines also support the same options as <#630#>Plot<#630#> does,
Two of the options, <#631#>PlotRange<#631#> and <#632#>DisplayFunction<#632#>, are useful for
generating animations of frequency dependence on a parameter.