You can use the Simulation Data Inspector to view and inspect signals from simulations or from imported data. The Simulation Data Inspector provides a comprehensive view of your data by allowing you to group data from multiple simulations on multiple plots. You can also use data cursors for close examination of signal values.
This example shows you how to view and inspect signal data from the
slexAircraftExample model using the Simulation Data Inspector.
This example uses signal logging to send data to the Simulation Data Inspector. You can
also record logged simulation data or import signal data from the base workspace or a
MAT-file. For more information, see Populate the Simulation Data Inspector with Your Data. Open the
slexAircraftExample model, mark signals for logging, and run a
To open the model, enter
slexAircraftExample in the MATLAB® Command Window.
To log the
q, rad/sec, the
Stick, and the
alpha, rad signals to the Simulation Data Inspector, select the
signals in the model. Then, click the Simulation Data Inspector
drop-down, and select Log Selected Signals.
The logging badge appears above each signal marked for logging.
Double-click the Pilot block. Set Wave form to
sine, and click OK.
In the Simulink® Editor, click the Simulation Data Inspector button to open the Simulation Data Inspector.
Simulate the model. A new run appears in the Simulation Data Inspector.
By default, the Inspect pane lists all logged signals in rows, organized by simulation run. You can expand or collapse any of the runs to view the signals in a run. For more information on signal grouping, see Organize Your Simulation Data Inspector Workspace.
To select signals to view in the graphical viewing area, use the checkboxes next to the
signals in the navigation pane. Select the check boxes next to the
alpha, rad signals.
You can also use signal browsing mode to quickly view all the signals in your run.
In the Simulation Data Inspector, you can inspect signals using data cursors. You can choose to use one or two data cursors.
With two data cursors, three time values are displayed: the time corresponding to each cursor position and the time spanned by the cursors. You can move the two cursors together by dragging the span label between the two cursors. You can also set the span by typing the desired value into the label field.
Practice inspecting data with cursors by adding one cursor to the plot.
To add a cursor to the plot, click the single cursor button.
Drag the data cursor left or right to a point of interest. You can also use the arrow keys to move the data cursor.
To inspect the data at a specific point in time, click the data cursor time field
and enter the desired time value, for example
If the signal does not have a sample value at the point of interest, the Simulation Data Inspector interpolates the value for the indicated time. An asterisk in the data cursor label indicates that the displayed value is interpolated. For information regarding interpolation methods, see Interpolation Options in the Simulation Data Inspector.
When you have finished inspecting the data, click the single cursor button to remove the cursor from the graphical viewing area.
Zoom and pan to inspect signal values and the relationships between signals. The zoom and pan controls in the Simulation Data Inspector are on the toolstrip above the graphical viewing area. Each icon allows you to control the aspects of the plot your mouse controls.
With the mouse pointer selected, you can select signals by clicking them and pan by clicking anywhere on the plot and dragging the mouse.
Click the fit-to-view option to scale the axes to accommodate your plotted data.
When you select the y-axis zoom option, all the mouse actions zoom on the y-axis. You can click in the graphical viewing area to zoom in a fixed amount. You can also click and drag to select a portion of the plot as the limits for the y-axis. Scrolling with the mouse wheel zooms in and out on the y-axis.
The t-axis zoom option makes all the mouse actions zoom on the t-axis. You can click the graphical viewing area to zoom in a fixed amount. You can click and drag the graphical viewing area to select a portion of the plot as the limits for the t-axis. Scrolling with the mouse wheel zooms in and out on the t-axis.
Click the zoom-out option to zoom out a fixed amount.
When you select the zoom-in option, all the mouse actions zoom in on both the y- and t-axes. You can click the graphical viewing area to zoom in a fixed amount on both axes. You can also click and drag to select an area to define the y- and t-axes. Scrolling with the mouse wheel zooms in and out on both axes.
You can use subplot layouts to view groups of signals on different subplots. For example, you can group the same signal from different simulation runs or group signals that have a similar range of values.
In the model, double-click the Pilot block. Set Wave form to
square, and click OK.
Simulate the model.
Click the Layout button and specify a
3×1 arrangement in the Grid
section of the menu.
Click the middle subplot in the graphical viewing area. In the
Inspect pane, select the check boxes for the
alpha, rad signals
The check boxes in the Inspect pane indicate the signals plotted in the selected subplot, which is outlined in blue.
You can also move plotted signals to other subplots graphically, rather than using the check boxes.
Select the signal you want to move.
Drag the signal to the plot where you want to plot it.
For more information on working with plots, see Create Plots Using the Simulation Data Inspector.
Subplots are linked by default, meaning that all plots in the graphical viewing area stay synchronized when you pan and zoom. Linked plots have a synchronized response when you:
Click a plot and drag to pan
Perform any zoom operation
Fit to view
To pan and zoom independently in a subplot, you can unlink the subplot.
Select the subplot you want to unlink.
Click the settings button in the upper right of the graph.
On the More tab, click the check box labeled Link Subplot.
The broken link symbol appears on the unlinked subplot.
The Simulation Data Inspector allows you to view run and signal metadata. You can view signal metadata in the properties pane or in the table of signals under each run. You can view run data only in the properties pane.
The properties pane displays the metadata for the selected run or signal. You can edit properties using the white box in the Values column. When you view a comparison, the Simulation Data Inspector highlights metadata differences in red.
Columns in the navigation pane allow you to display signal properties in the table of signals under each run. To add or remove columns in the table, select the columns you want to display from the list on the Columns tab of the navigation pane's Preferences menu. Columns appear in the table in the order in which you select them.
|Line||Signal line style and color|
|Units||Signal measurement units|
|Data Type||Signal data type|
|Sample Time||Type of sampling|
|Model||Name of the model that generated the signal|
|Block Name||Name of the signal's source block|
|Block Path||Path to the signal's source block|
|Port||Index of the signal on the block's output port|
|Dimensions||Dimensions of the matrix containing the signal|
|Channel||Index of signal within matrix|
|Run||Name of the simulation run containing the signal|
|Absolute Tolerance||User-specified, positive-valued absolute tolerance for the signal|
|Relative Tolerance||User-specified, positive-valued relative tolerance for the signal|
|Override Global Tolerance||User-specified property that determines whether signal tolerances take priority over global tolerances|
|Time Tolerance||User-specified, positive-valued time tolerance for the signal|
|Interp Method||User-specified interpolation method used to plot the signal|
|Sync Method||User-specified synchronization method used to coordinate signals for comparison|
|Time Series Root||Name of the variable associated with signals imported from the MATLAB workspace|
|Time Source||Name of the array containing the time data for signals imported from the MATLAB workspace|
|Data Source||Name of the array containing the data for signals imported from the MATLAB workspace|
On the Compare pane, many parameters have a Baseline column and a Compare To column that you can display independently. If the Baseline and Compare to signals both have a property, but you can only display one property column, the column shows the Baseline property. In addition to the parameters listed for the Inspect pane, the Compare pane has columns specific to comparisons.
Max Difference – The maximum difference between the Baseline and Compare to signals
Align By – Primary signal alignment criterion specified in the Alignment tab of the Simulation Data Inspector Preferences menu
By default, the table displays the baseline name column and a column indicating whether the comparisons passed or failed.
The Simulation Data Inspector visualizes data from event-based systems with stem plots. To plot event-based or message data, mark the signal for logging. When you simulate the model, the data appears in the Simulation Data Inspector as a stem plot for each event. The stem plot shows the number of events recorded for each sample time.