💡 TLDR: Every plottable has an XAxisIndex and YAxisIndex field that determines which axis it will render on. You can use the primary (bottom/left) or secondary (right/top) axes, or Add() your own to achieve multiple axes on the same edge of a plot.

Plot on a Secondary Axis

Set your Plottable’s XAxisIndex and YAxisIndex to match the index of the axis you intend to plot on. Primary axes (left and bottom) are index 0, secondary axes (right and top) are index 1, and axes added with Plot.Add() are higher values.

// Plot using the primary axes (bottom and left)
var mySignalPlot1 = plt.AddSignal(myData1);
mySignalPlot1.YAxisIndex = 0;
mySignalPlot1.XAxisIndex = 0;

// Plot using the secondary axes (right and top)
var mySignalPlot2 = plt.AddSignal(myData2);
mySignalPlot2.YAxisIndex = 1;
mySignalPlot2.XAxisIndex = 1;

Additional Axes

Multiple axes on the same side of the plot are possible with ScottPlot. It is possible to display multiple axes on the same side of the plot. The 4 standard axes (XAxis, YAxis, XAxis2, and YAxis2) surround the data area on all sides, but you can instantiate your own axes and add them to the plot. These additional axes will be stacked outward away from the data area.

// Plot using the primary axes (bottom and left)
var mySignalPlot1 = plt.AddSignal(myData1);
mySignalPlot1.XAxisIndex = 0;
mySignalPlot1.YAxisIndex = 0;

// Create another axis to the left and give it an index of 2
var secondYAxis = plt.AddAxis(Edge.Left, axisIndex: 2);

// Plot using the primary X axis but our custom Y axis
var mySignalPlot2 = plt.AddSignal(myData2);
mySignalPlot1.XAxisIndex = 0;
mySignalPlot1.YAxisIndex = 2;

👉 The ScottPlot Cookbook has additional information and code examples demonstrating advanced multi-axis functionality