Applications are open for the 2018 John Hunter Matplotlib Summer Fellowship. Apply now!
Version 2.2.2
Fork me on GitHub*args, data=None, **kwargs)

Make a bar plot.

Call signatures:

bar(x, height, *, align='center', **kwargs)
bar(x, height, width, *, align='center', **kwargs)
bar(x, height, width, bottom, *, align='center', **kwargs)

The bars are positioned at x with the given align ment. Their dimensions are given by width and height. The vertical baseline is bottom (default 0).

Each of x, height, width, and bottom may either be a scalar applying to all bars, or it may be a sequence of length N providing a separate value for each bar.

x : sequence of scalars

The x coordinates of the bars. See also align for the alignment of the bars to the coordinates.

height : scalar or sequence of scalars

The height(s) of the bars.

width : scalar or array-like, optional

The width(s) of the bars (default: 0.8).

bottom : scalar or array-like, optional

The y coordinate(s) of the bars bases (default: 0).

align : {‘center’, ‘edge’}, optional, default: ‘center’

Alignment of the bars to the x coordinates:

  • ‘center’: Center the base on the x positions.
  • ‘edge’: Align the left edges of the bars with the x positions.

To align the bars on the right edge pass a negative width and align='edge'.


Container with all the bars and optionally errorbars.

Other Parameters:
color : scalar or array-like, optional

The colors of the bar faces.

edgecolor : scalar or array-like, optional

The colors of the bar edges.

linewidth : scalar or array-like, optional

Width of the bar edge(s). If 0, don’t draw edges.

tick_label : string or array-like, optional

The tick labels of the bars. Default: None (Use default numeric labels.)

xerr, yerr : scalar or array-like of shape(N,) or shape(2,N), optional

If not None, add horizontal / vertical errorbars to the bar tips. The values are +/- sizes relative to the data:

  • scalar: symmetric +/- values for all bars
  • shape(N,): symmetric +/- values for each bar
  • shape(2,N): separate + and - values for each bar

Default: None

ecolor : scalar or array-like, optional, default: ‘black’

The line color of the errorbars.

capsize : scalar, optional

The length of the error bar caps in points. Default: None, which will take the value from rcParams["errorbar.capsize"].

error_kw : dict, optional

Dictionary of kwargs to be passed to the errorbar method. Values of ecolor or capsize defined here take precedence over the independent kwargs.

log : bool, optional, default: False

If True, set the y-axis to be log scale.

orientation : {‘vertical’, ‘horizontal’}, optional

This is for internal use only. Please use barh for horizontal bar plots. Default: ‘vertical’.

See also

Plot a horizontal bar plot.


The optional arguments color, edgecolor, linewidth, xerr, and yerr can be either scalars or sequences of length equal to the number of bars. This enables you to use bar as the basis for stacked bar charts, or candlestick plots. Detail: xerr and yerr are passed directly to errorbar(), so they can also have shape 2xN for independent specification of lower and upper errors.

Other optional kwargs:

Property Description
agg_filter a filter function, which takes a (m, n, 3) float array and a dpi value, and returns a (m, n, 3) array
alpha float or None
animated bool
antialiased or aa bool or None
capstyle [‘butt’ | ‘round’ | ‘projecting’]
clip_box a Bbox instance
clip_on bool
clip_path [(Path, Transform) | Patch | None]
color matplotlib color spec
contains a callable function
edgecolor or ec mpl color spec, None, ‘none’, or ‘auto’
facecolor or fc mpl color spec, or None for default, or ‘none’ for no color
figure a Figure instance
fill bool
gid an id string
hatch [‘/’ | ‘' | ‘|’ | ‘-‘ | ‘+’ | ‘x’ | ‘o’ | ‘O’ | ‘.’ | ‘*’]
joinstyle [‘miter’ | ‘round’ | ‘bevel’]
label object
linestyle or ls [‘solid’ | ‘dashed’, ‘dashdot’, ‘dotted’ | (offset, on-off-dash-seq) | '-' | '--' | '-.' | ':' | 'None' | ' ' | '']
linewidth or lw float or None for default
path_effects AbstractPathEffect
picker [None | bool | float | callable]
rasterized bool or None
sketch_params (scale: float, length: float, randomness: float)
snap bool or None
transform Transform
url a url string
visible bool
zorder float


In addition to the above described arguments, this function can take a data keyword argument. If such a data argument is given, the following arguments are replaced by data[<arg>]:

  • All arguments with the following names: ‘bottom’, ‘color’, ‘ecolor’, ‘edgecolor’, ‘height’, ‘left’, ‘linewidth’, ‘tick_label’, ‘width’, ‘x’, ‘xerr’, ‘y’, ‘yerr’.
  • All positional arguments.