Markers

Markers are persistent annotations on a chart. MathJet supports five kinds: data labels (text on every data point), data markers (callouts on specific data points), delta markers (paired markers showing the difference between two points), X markers (vertical reference lines), and Y markers (horizontal reference lines). Each kind has its own auto-generated value table that stays synchronized with the chart.

Data labels

Data labels are simple text strings shown right on top of every data point in a chart. Toggle them on or off and choose what information to display from Plot → Data Labels.

Data labels can be enabled for all graph types, including 2D lines, 3D surfaces, and vector graphs.

By default, data symbols are automatically drawn when at least one graph data component is active in the data label, but you can turn that off from the same menu. To clear all data labels, select None from the menu.

Data labels — text annotations on every data point.

Data markers

Data markers show the values of specific data points of interest in a chart. They can be added in either batch or interactive mode.

Batch mode. Select the data points you want to mark, then click Plot → Markers → Mark Selected Data Points or the corresponding tool button. To add markers on all data points of currently-selected graphs, use Plot → Markers → Mark All Data Points. If no data point or graph is selected before clicking that button, data markers are added to all data points on every graph in the chart.

Interactive mode. Click Plot → Markers → Add Data Marker or the corresponding tool button. As you move the mouse inside a chart, a target symbol shows up at the data point closest to the current cursor position. Click the left mouse button to add a marker on that point. Repeat to add as many markers as you want. Click the Add Data Marker tool button again, or press Escape, to exit the interactive mode.

After data markers are added, you can move them around by grabbing them at the data symbols. For 2D line graphs, several additional commands let you quickly move markers to special locations like the next peak or minimum.

Beyond the usual Edit Properties dialog, you can quickly change callout shape types from the Markers menu. The default callout location can also be changed with the Set Callout Location action, and you can manually adjust callout positions by dragging them.

By default, a Data Marker Value table is automatically inserted into the chart as soon as you add the first data marker. The table summarizes all markers and lets you change their names and locations. Toggle the table via View → Chart Components → Data Marker Values or the corresponding tool button.

Data marker — adding annotations to specific data points in batch and interactive modes.

Delta markers

Delta markers indicate the differences in coordinates and values between two data points.

To start adding delta markers, click Plot → Markers → Add Delta Marker or the corresponding tool button. Delta markers are automatically created as you add data markers in pairs. When you’re done, click Finish adding delta marker in the context menu, or press Escape, to exit the delta marker creation mode.

After a delta marker is created, you can change the locations of the two data points by dragging them at the data symbols. The delta values update automatically.

By default, a Delta Marker Value table is inserted into the chart when the first delta marker is created. Toggle it via View → Chart Components → Delta Marker Values or the corresponding tool button.

Delta markers work on both 2D graphs and 3D surface plots. In a 3D chart, a delta marker shows a single direct line between the two data points with differences in all three dimensions shown along the line.

Delta marker — measuring the difference between two data points.

X markers

For 2D charts, X markers display values for multiple line graphs at a specific x-coordinate simultaneously.

Click Plot → Markers → Add X Marker or the corresponding tool button. A new X marker appears at the chart’s horizontal center. Move the mouse until the marker is at the desired location, then click the left mouse button to finish.

When you add the first X marker, an X Marker Value table is automatically inserted. The table summarizes values of all X markers and lets you change their names or locations quickly. Toggle visibility via View → Chart Components → X Marker Values or the corresponding tool button.

X marker — vertical reference line that reports values for every line graph it crosses.

Y markers

Y markers show the x-values of intersecting points on a line graph.

Click Plot → Markers → Add Y Marker or the corresponding tool button. A new Y marker appears in the vertical center of the chart. Move the mouse until the marker is at the desired location, then click the left mouse button to finish. By default, the Y marker only shows the first crossing point of each line graph starting from the left, but you can move a value tag to a different crossing point by grabbing it at the data symbol. To show tags at multiple crossings per line, increase the NumOfTagsPerLine property of the Y marker.

When you add the first Y marker, a Y Marker Value table is automatically inserted. Toggle visibility via View → Chart Components → Y Marker Values or the corresponding tool button.

Y marker — horizontal reference line that reports the x-values of intersecting points.