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Overview

The Stem Plot node is a statistical-plot node in a Weave Workflow that represents numerical data as stems topped with markers, rising from a baseline. A stem plot, also known as a stem-and-leaf plot, is a simple method of representing numerical data while maintaining the original data values. A stem plot is similar to a histogram but provides more detailed information about individual data points. 

The node sits under the Statistics tab, distinct from the transformation nodes, and produces a visual output rather than a transformed table. Configuration uses the multi-field selection popup (Select Fields for Y axis), the same pattern as the Bar Plot node: the selected fields are plotted on the Y axis and the X axis is the row index.

Note: “Workflow” is the in-UI term for what some Weave documentation calls a pipeline. This reference uses “Workflow.”

When to use it

  1. Showing individual data point values while preserving their order along an index.
  2. Seeing point-by-point structure that a histogram’s binning would hide.
  3. Comparing the shape of one or more fields across the same index.

Configuration

StepDescription
SelectOpens the Stem Plot popup listing the columns in the upstream data.
Select AllSelects every column in the popup.
Column checkboxesChoose the fields to plot; each is rendered as a stem plot.
ApplyCommits the field selection.

Chart elements

ElementDescription
Y axisShows the values of the selected field.
X axis (Index)Shows the row index.
StemsVertical lines from the baseline to each data point.
MarkersA dot at the top of each stem marking the value.
BaselineThe horizontal line the stems rise from.

Key behaviors

Statistical-plot node. Stem Plot is found under the Statistics tab, separate from the transformation nodes, and outputs a visualization rather than a modified data table.

Field selection drives the Y axis. The selected fields are plotted on the Y axis against the row index, the same configuration pattern as the Bar Plot node.

Preserves individual points. Unlike a histogram, which aggregates into bins, the stem plot shows each data point as its own stem, retaining the original values.