matplotlib.axes.Axes.stem#

Axes.stem(*args, linefmt=None, markerfmt=None, basefmt=None, bottom=0, label=None, orientation='vertical', data=None)[source]#

Create a stem plot.

A stem plot draws lines perpendicular to a baseline at each location locs from the baseline to heads, and places a marker there. For vertical stem plots (the default), the locs are x positions, and the heads are y values. For horizontal stem plots, the locs are y positions, and the heads are x values.

Call signature:

stem([locs,] heads, linefmt=None, markerfmt=None, basefmt=None)

The locs-positions are optional. linefmt may be provided as positional, but all other formats must be provided as keyword arguments.

Parameters:

locsarray-like, default: (0, 1, ..., len(heads) - 1)

For vertical stem plots, the x-positions of the stems. For horizontal stem plots, the y-positions of the stems.

headsarray-like

For vertical stem plots, the y-values of the stem heads. For horizontal stem plots, the x-values of the stem heads.

linefmtstr, optional

A string defining the color and/or linestyle of the vertical lines:

Character	Line Style
`'-'`	solid line
`'--'`	dashed line
`'-.'`	dash-dot line
`':'`	dotted line

Default: 'C0-', i.e. solid line with the first color of the color cycle.

Note: Markers specified through this parameter (e.g. 'x') will be silently ignored. Instead, markers should be specified using markerfmt.

markerfmtstr, optional

A string defining the color and/or shape of the markers at the stem heads. If the marker is not given, use the marker 'o', i.e. filled circles. If the color is not given, use the color from linefmt.

basefmtstr, default: 'C3-' ('C2-' in classic mode)