Parallel Coordinates displays each trial as a polyline crossing vertical axes —
one axis per parameter or objective. This allows simultaneous visualization of
high-dimensional data, making it easy to see patterns, correlations, and
clusters across many variables at once.
Controls
Item
Description
Color by
Use the "Color by" dropdown to select which axis value is used to color the polylines, according to the active colormap.
Axes
Use the "Axes" dropdown to show or hide individual axes. "All" and "None" buttons toggle all axes at once.
Show Infeasible (constrained studies only)
Toggle display of infeasible trials, shown in a distinct color.
Operations
Item
Description
Brush / filter
Click and drag on an axis to create a range filter. Only trials passing through the selected range are highlighted.
Move brush
Click and drag an existing brush range to slide it along the axis.
Multi-brush
Create brushes on multiple axes simultaneously to narrow down trials.
Clear all brushes
Double-click or right-click anywhere on the chart to clear all active brushes.
How to Read
Converging lines: lines that converge to a narrow band on an axis indicate
that good trials share a similar value for that variable.
Parallel bands: multiple lines forming a consistent band across several
axes suggest a cluster of similar trials.
Crossing lines: lines that cross each other between two axes indicate a
negative correlation between those two variables — when one goes up, the other
tends to go down.
Parallel lines: lines that do not cross between two axes indicate a
positive correlation.
Outlier lines: lines that deviate sharply from the main bundle are outlier
trials — they may represent unusual solutions worth investigating.
Use brushing: drag on the objective axis to select only top-performing
trials, then observe which parameter values they share.
