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The Plot command generates an XY-plot of two or more user-specified object properties, displaying all available values. For more information, see the Generating Output Guide.




Plot myXValue, myYValue;
Plot myXValue, myYValue1, myYValue2;
Plot mySpacecraft.ElapsedTime, mySpacecraft.A;
Plot mySpacecraft.EpochText, mySpacecraft.Contact(myGroundStation), mySpacecraft.RangeRate(myGroundStation);


Where myXValue and myYValue evaluate to numbers




At least two object properties must be specified for display.

The first object property in the list will be displayed on the x-axis; the following properties will be displayed on the y-axis.

An unlimited number of object properties can be plotted.

The Monitor command provides the same functionality as the Plot command, but automatically erases older data points so that only the most recent data is shown.

To minimize system resources, plot data is thinned after a predefined number of data points are plotted. The default number of allowable data points is 500; this can be configured through FreeFlyer's Options Menu à Preferences à User Preferences à Plot Properties page.

To minimize system resources, plots are only updated after a predefined number of data points have been collected into a buffer. The default buffer size is 25 points; this can be configured through FreeFlyer's Options Menu à Preferences à User Preferences à Plot Properties page.

You can hide certain series from plots by setting the value to -999. This can be used to display only the most important data at different times, or to color-code the data during an event.

A PlotWindow object can be used in place of a Plot command.

oPlotWindows can display graphical data in either a Cartesian or polar coordinate system, with monitor mode turned on or off.

oPlotWindows can be updated using the Update command at any point in the Mission Sequence.

In millisecond timing precision mode only, the deprecated "as Global" syntax can be used to update the plot when any spacecraft is Stepped or Maneuvered.

oNote that the "as Global" option is scoped to the control statement it was called in. That is to say, when the "as Global" option is used inside of an If block, While loop, or For loop, all steps inside of the control statement will automatically be displayed; any steps taken outside of the control statement will NOT be displayed.

Plot mySpacecraft.ElapsedDays, mySpacecraft.A as Global;


Example Plot Output

Example Plot Output


Command Editor

Note: The Plot, PolarPlot, Monitor, and PolarMonitor command editors are all accessed by adding a Plot command editor to the Mission Sequence.


Plot Type

X-Y Plot

Polar Plot


Monitor Mode


oAll available values are displayed


oThe plot will begin erasing the oldest data points once the number of points reaches or exceeds the maximum points setting for the plot, so that it will only display the most recent data


X-Y Plot Properties

Defines the x- and y-axes of the plot

Use the More button to add additional series to the y-axis



Displays the FreeFlyer Script that is generated by the editor



Displays descriptions of the editor and its fields

Description text changes as the mouse pointer moves over the different fields within the editor




See Also

Monitor Command

PolarPlot Command

PolarMonitor Command


Generating Output Guide