Array Plot

Display vectors or arrays

• Library:

• DSP System Toolbox / Sinks

Description

The Array Plot block plots vectors or arrays of data. It is a vector plot where data is uniformly spaced along the x-axis. You can specify the spacing to use with the Sample Increment property.

Ports

Input

Port_1 — Signal or signals to visualize

scalar | vector | matrix | array

Connect the signals you want to visualize. You can have up to 96 input ports. Input signals must have these characteristics:

• Fixed number of channels, but size can be variable.

• Discrete sample time.

• Real- or complex values.

• Floating- or fixed-point data type.

• 2-D and non-scalar.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point | enumerated
Complex Number Support: Yes

Properties

Configuration Properties

The Configuration Properties dialog box controls various properties about the scope displays. To open the configuration properties dialog box, select View > Configuration Properties. Alternatively, in the toolbar, click the Configuration Properties button.

Main

X-data mode — Type of x-axis spacing

Sample increment and X-offset (default) | Custom

Select the type of spacing to use between x-axis data values.

Sample increment and X-offset

Use the Sample increment and X-offset values to specify x-axis data.

Custom

Specify a custom spacing using the Custom X-data property.

Programmatic Use

See XDataMode.

Sample increment — Spacing between samples

1 (default) | finite scalar

Specify the spacing between samples along the x-axis as a finite numeric scalar. The input signal is only y-axis data. x-axis data is set automatically based on both the Sample increment and X-offset values. For example, when X-offset is 0 and Sample increment is 1, the x-axis data for the input signal is set to 0, 1, 2, 3, 4, … . If you set Sample increment to 0.25, the x-axis data becomes 0, 0.25, 0.5, 0.75, 1, … .

Tunable: Yes

Dependency

To use this property, set X-data mode to Sample increment and X-offset.

Programmatic Use

See SampleIncrement.

X-offset — x-axis offset

0 (default) | scalar

Specify the offset to apply to the x-axis, as a numeric scalar. x-axis data is set automatically based on both the Sample increment and X-offset values. The offset represents the first value on the x-axis. For example, when X-offset is 0 and Sample increment is 1, the x-axis data for the input signal is set to 0, 1, 2, 3, 4, … . If you set X-offset to -3, the x-axis data becomes -3, -2, -1, 0, 1, … .

Tunable: Yes

Dependency

To use this property, set X-data mode to Custom.

Programmatic Use

See XOffset.

Custom X-data — x-axis data values

empty vector (default) | vector with length equal to the input frame length

Specify the x-axis data values as a vector of length equal to the frame length of the inputs. This property is displayed only if the X-data mode property is Custom. If you use the default (empty vector) value, the x-axis data is uniformly spaced over the interval (0:L-1), where L is the frame length.

Example: A custom logarithmic x-axis data scaling is [0:log10(44100/2):1024]

Tunable: Yes

Programmatic Use

See CustomXData.

X-axis scale — x-axis scale

Linear (default) | Log

Select Linear or Log as the x-axis scale. If X-offset is a negative value, you cannot set X-axis scale to Log.

Tunable: Yes

Programmatic Use

See XScale.

Y-axis scale — y-axis scale

Linear (default) | Log

Select Linear or Log as the y-axis scale.

Tunable: Yes

Programmatic Use

See YScale.

Maximize axes — Maximize size of plots

Auto (default) | Off | On

• Auto - If Title and Y-label properties are not specified, maximize all plots.

• On - Maximize all plots. Values in Title and Y-label are hidden.

• Off - Do not maximize plots.

Tunable: Yes

Programmatic Use

See MaximizeAxes.

Display

Title — Display name

%<SignalLabel> (default) | string

Specify a title for display. The default value %<SignalLabel> uses the input signal name for the title.

Tunable: Yes

Programmatic Use

See Title

Show legend — Display signal legend

off (default) | on

Toggle signal legend. The names listed in the legend are the signal names from the model. For signals with multiple channels, a channel index is appended after the signal name. Continuous signals have straight lines before their names, and discrete signals have step-shaped lines.

From the legend, you can control which signals are visible. This control is equivalent to changing the visibility in the Style properties. In the scope legend, click a signal name to hide the signal in the scope. To show the signal, click the signal name again. To show only one signal, right-click the signal name, which hides all other signals. To show all signals, press Esc.

Note

The legend only shows the first 20 signals. Any additional signals cannot be controlled from the legend.

Tunable: Yes

Programmatic Use

See ShowLegend

Show grid — Show internal grid lines

on (default) | off

Toggle gridlines.

Tunable: Yes

Programmatic Use

See ShowGrid

Plot signals as magnitude and phase — Split display into magnitude and phase plots

off (default) | on

• On - Display magnitude and phase plots. If the signal is real, the scope plots the absolute value of the signal for the magnitude. The phase is 0 degrees for positive values and 180 degrees for negative values. This feature is useful for complex-valued input signals. If the input is a real-valued signal, selecting this check box returns the absolute value of the signal for the magnitude.

• Off - Display signal plot. If the signal is complex, the scope plots the real and imaginary parts on the same y-axis.

Tunable: Yes

Programmatic Use

See PlotAsMagnitudePhase.

X-label — x-axis label

none (default) | string

Specify the text for the scope to display below the x-axis.

Tunable: Yes

Programmatic Use

See XLabel.

Y-label — Y-axis label

none (default) | string

Specify the text to display on the y-axis. To display signal units, add (%<SignalUnits>) to the label. At the beginning of a simulation, Simulink^® replaces (%SignalUnits) with the units associated with the signals.

Example: For a velocity signal with units of m/s, enter Velocity (%<SignalUnits>).

Tunable: Yes

Dependency

If you select Plot signals as magnitude and phase, this property does not apply. The y-axes are labeled Magnitude and Phase.

Programmatic Use

See YLabel

Y-limits (Minimum) — Minimum y-axis value

-10 (default) | real scalar

Specify the minimum value of the y-axis as a real number.

Tunable: Yes

Dependency

If you select Plot signals as magnitude and phase, this property only applies to the magnitude plot. The y-axis limits of the phase plot are always [-180,180].

Programmatic Use

See YLimits

Y-limits (Maximum) — Maximum y-axis value

10 (default) | real scalar

Specify the maximum value of the y-axis as a real number.

Tunable: Yes

Dependency

If you select Plot signals as magnitude and phase, this property only applies to the magnitude plot. The y-axis limits of the phase plot are always [-180,180].

Programmatic Use

See YLimits

Axes Scaling Properties

The Axes Scaling properties control the axes limits of the Array Plot. To open the Axes Scaling properties, in the Array Plot menu, select Tools > Axes Scaling > Axes Scaling Properties.

Axes scaling — Y-axis scaling mode

Manual (default) | Auto | After N Updates

• Manual - Manually scale y-axis range with Scale Y-axis Limits toolbar button.

• Auto - Scale y-axis range during and after simulation. Selecting this option displays the Do not allow Y-axis limits to shrink check box.

  If you want the y-axis range to increase and decrease with the maximum value of a signal, set Axes scaling to Auto and clear the Do not allow Y-axis limits to shrink check box.

• After N Updates - Scale y-axis after the number of time steps specified in the Number of updates text box (10 by default). Scaling occurs only once during each run.

Tunable: Yes

Programmatic Use

See AxesScaling

Do not allow Y-axis limits to shrink — How y-axis limits can change

on (default) | off

• On - Allow y-axis range limits to increase but not decrease during a simulation.

• Off - Allow y-axis range limits to increase and decrease.

Tunable: Yes

Dependency

To enable this property, set Axes scaling to Auto.

Number of updates — Number of updates before scaling

10 (default) | integer

Set this property to delay auto scaling the y-axis.

Tunable: Yes

Dependency

To enable this property, set Axes scaling to After N Updates.

Programmatic Use

See AxesScalingNumUpdates

Scale axes limits at stop — When y-axis limits can change

on (default) | off

• On - Scale axes when simulation stops.

• Off - Scale axes continually.

Tunable: Yes

Y-axis Data range (%) — Percent of y-axis to plot on

80 (default) | integer between [1, 100]

Specify percentage of y-axis range for plotting data. For example, if you set this property to 100, plotted data uses the entire y-axis range.

Tunable: Yes

Y-axis Align — Alignment along y-axis

Center (default) | Top | Bottom

Specify where to align plotted data along the y-axis data range when Y-axis Data range is set to less than 100 percent.

• Top - Align signals with maximum values at top of y-axis range.

• Center - Center signals between minimum and maximum values.

• Bottom - Align signals with minimum values at bottom of y-axis range.

Tunable: Yes

Style

Open the Style dialog box by selecting View > Style or the Style button () in the dropdown below the Configuration Properties gear icon. In this dialog box, you can change the figure colors, background axes colors, foreground axes colors, and properties of lines in a display.

Figure color — Background color for window

black (default) | color

Background color for the scope

Tunable: Yes

Plot type — Type of plot

Stem (default) | Stairs | Line

• Line - Line graph

• Stairs - Stair-step graph

• Stem - Stem graph

Tunable: Yes

Programmatic Use

See PlotType.

Axes colors — Background and axes color for individual displays

black (default) | color

Select the background color for axes (displays) with the first color palette. Select the grid and label color with the second color palette.

Properties for line — Line to change

Channel 1 (default)

Select active line for setting line style properties.

Tunable: Yes

Visible — Line visibility

on (default) | off

Show or hide a signal on the plot.

Tunable: Yes

Dependency

The Properties for line property determines which line is affected.

Line — Line style

style | width | color

Select line style, width, and color.

Tunable: Yes

Dependency

The Properties for line property determines which line is affected.

Marker — Data point marker style

None (default) | marker shape

Select marker style.

Tunable: Yes

Dependency

The Properties for line property determines which line is affected.

Model Examples

Group Delay Estimation

Estimate the group delay of a filter in Simulink. Group delay is defined as -d(phi(f))/d(f). To estimate the group delay of the filter extract the phase response and compute its negative derivative with respect to frequency.

Open Model

Analyze a Subband of Input Frequencies Using Zoom FFT

Compute the zoom FFT of a sine wave in Simulink.

Open Script

Filtered-X LMS Adaptive Noise Control Filter

Use a Filtered-X LMS algorithm in Adaptive Noise Control (ANC).

Open Model

Streaming Power Spectrum Estimation Using Welch's Method

Showcases a block that outputs the streaming power spectrum estimate of a time-domain input via Welch's method of averaged modified periodograms.

Open Model

Block Characteristics

Data Types	Boolean | double | enumerated | fixed point | integer | single
Direct Feedthrough	no
Multidimensional Signals	yes
Variable-Size Signals	yes
Zero-Crossing Detection	no

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

This block can be used for simulation visibility in system that generate code, but is not included in the generated code.

PLC Code Generation
Generate Structured Text code using Simulink® PLC Coder™.

Fixed-Point Conversion

Convert floating-point algorithms to fixed point using Fixed-Point Designer™.

This block accepts fixed-point input, but converts it to double for display.