matplotlib.axes.Axes.errorbar #

Axes.errorbar(x,y,yerr=None,xerr=None,fmt='',*,ecolor=None,elinewidth=None,capsize=None,barsabove=False,lolims=False,uplims=False,xlolims=False,xuplims=False,errorevery=1,capthick=None,data=None,**kwargs)[source]#

Plot y versus x as lines and/or markers with attached errorbars.

x,y define the data locations,xerr,yerr define the errorbarsizes. By default, this draws the data markers/lines as well as theerrorbars. Use fmt='none' to draw errorbars without any data markers.

Added in version 3.7:Caps and error lines are drawn in polar coordinates on polar plots.

Parameters:

x, yfloat or array-like

The data positions.

xerr, yerrfloat or array-like, shape(N,) or shape(2, N), optional

The errorbar sizes:

scalar: Symmetric +/- values for all data points.
shape(N,): Symmetric +/-values for each data point.
shape(2, N): Separate - and + values for each bar. First rowcontains the lower errors, the second row contains the uppererrors.
None: No errorbar.

All values must be >= 0.

SeeDifferent ways of specifying error barsfor an example on the usage ofxerr andyerr.

fmtstr, default: ''

The format for the data points / data lines. Seeplot fordetails.

Use 'none' (case-insensitive) to plot errorbars without any datamarkers.

ecolorcolor, default: None

The color of the errorbar lines. If None, use the color of theline connecting the markers.

elinewidthfloat, default: None

The linewidth of the errorbar lines. If None, the linewidth ofthe current style is used.

capsizefloat, default:rcParams["errorbar.capsize"] (default:0.0)

The length of the error bar caps in points.

capthickfloat, default: None

An alias to the keyword argumentmarkeredgewidth (a.k.a.mew).This setting is a more sensible name for the property thatcontrols the thickness of the error bar cap in points. Forbackwards compatibility, ifmew ormarkeredgewidth are given,then they will over-ridecapthick. This may change in futurereleases.

barsabovebool, default: False

If True, will plot the errorbars above the plotsymbols. Default is below.

lolims, uplims, xlolims, xuplimsbool or array-like, default: False

These arguments can be used to indicate that a value gives onlyupper/lower limits. In that case a caret symbol is used toindicate this.lims-arguments may be scalars, or array-likes ofthe same length asxerr andyerr. To use limits with invertedaxes,set_xlim orset_ylim must be called beforeerrorbar(). Note the tricky parameter names: setting e.g.lolims to True means that the y-value is alower limit of theTrue value, so, only anupward-pointing arrow will be drawn!

erroreveryint or (int, int), default: 1

draws error bars on a subset of the data.errorevery =N drawserror bars on the points (x[::N], y[::N]).errorevery =(start, N) draws error bars on the points(x[start::N], y[start::N]). e.g. errorevery=(6, 3)adds error bars to the data at (x[6], x[9], x[12], x[15], ...).Used to avoid overlapping error bars when two series share x-axisvalues.

Returns:

ErrorbarContainer

The container contains:

data_line : ALine2D instance of x, y plot markersand/or line.
caplines : A tuple ofLine2D instances of the errorbar caps.
barlinecols : A tuple ofLineCollection with the horizontal andvertical error ranges.

Other Parameters:

dataindexable object, optional

If given, the following parameters also accept a strings, which isinterpreted asdata[s] ifs is a key indata:

x,y,xerr,yerr

**kwargs

All other keyword arguments are passed on to theplot calldrawing the markers. For example, this code makes big red squareswith thick green edges:

x,y,yerr=rand(3,10)errorbar(x,y,yerr,marker='s',mfc='red',mec='green',ms=20,mew=4)

wheremfc,mec,ms andmew are aliases for the longerproperty names,markerfacecolor,markeredgecolor,markersizeandmarkeredgewidth.

Valid kwargs for the marker properties are:

dashes
dash_capstyle
dash_joinstyle
drawstyle
fillstyle
linestyle
marker
markeredgecolor
markeredgewidth
markerfacecolor
markerfacecoloralt
markersize
markevery
solid_capstyle
solid_joinstyle

Refer to the correspondingLine2D property for more details:

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 and two offsets from the bottom left corner of the image
`alpha`	float or None
`animated`	bool
`antialiased` or`aa`	bool
`clip_box`	`BboxBase` or None
`clip_on`	bool
`clip_path`	Patch or (Path, Transform) or None
`color` or`c`	color
`dash_capstyle`	`CapStyle` or {'butt', 'projecting', 'round'}
`dash_joinstyle`	`JoinStyle` or {'miter', 'round', 'bevel'}
`dashes`	sequence of floats (on/off ink in points) or (None, None)
`data`	(2, N) array or two 1D arrays
`drawstyle` or`ds`	{'default', 'steps', 'steps-pre', 'steps-mid', 'steps-post'}, default: 'default'
`figure`	`Figure` or`SubFigure`
`fillstyle`	{'full', 'left', 'right', 'bottom', 'top', 'none'}
`gapcolor`	color or None
`gid`	str
`in_layout`	bool
`label`	object
`linestyle` or`ls`	{'-', '--', '-.', ':', '', (offset, on-off-seq), ...}
`linewidth` or`lw`	float
`marker`	marker style string,`Path` or`MarkerStyle`
`markeredgecolor` or`mec`	color
`markeredgewidth` or`mew`	float
`markerfacecolor` or`mfc`	color
`markerfacecoloralt` or`mfcalt`	color
`markersize` or`ms`	float
`markevery`	None or int or (int, int) or slice or list[int] or float or (float, float) or list[bool]
`mouseover`	bool
`path_effects`	list of`AbstractPathEffect`
`picker`	float or callable[[Artist, Event], tuple[bool, dict]]
`pickradius`	float
`rasterized`	bool
`sketch_params`	(scale: float, length: float, randomness: float)
`snap`	bool or None
`solid_capstyle`	`CapStyle` or {'butt', 'projecting', 'round'}
`solid_joinstyle`	`JoinStyle` or {'miter', 'round', 'bevel'}
`transform`	unknown
`url`	str
`visible`	bool
`xdata`	1D array
`ydata`	1D array
`zorder`	float