Plot y versus x as lines and/or markers with attached errorbars.
x, y define the data locations, xerr, yerr define the errorbar sizes. By default, this draws the data markers/lines as well as the errorbars. 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.
The data positions.
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 row contains the lower errors, the second row contains the upper errors.
None: No errorbar.
All values must be >= 0.
See Different ways of specifying error bars for an example on the usage of xerr and yerr.
The format for the data points / data lines. See plot for details.
Use 'none' (case-insensitive) to plot errorbars without any data markers.
The color of the errorbar lines. If None, use the color of the line connecting the markers.
The linewidth of the errorbar lines. If None, the linewidth of the current style is used.
rcParams["errorbar.capsize"] (default: 0.0)
The length of the error bar caps in points.
An alias to the keyword argument markeredgewidth (a.k.a. mew). This setting is a more sensible name for the property that controls the thickness of the error bar cap in points. For backwards compatibility, if mew or markeredgewidth are given, then they will over-ride capthick. This may change in future releases.
If True, will plot the errorbars above the plot symbols. Default is below.
These arguments can be used to indicate that a value gives only upper/lower limits. In that case a caret symbol is used to indicate this. lims-arguments may be scalars, or array-likes of the same length as xerr and yerr. To use limits with inverted axes, set_xlim or set_ylim must be called before errorbar(). Note the tricky parameter names: setting e.g. lolims to True means that the y-value is a lower limit of the True value, so, only an upward-pointing arrow will be drawn!
draws error bars on a subset of the data. errorevery =N draws error 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-axis values.
ErrorbarContainer
The container contains:
data_line : A Line2D instance of x, y plot markers and/or line.
caplines : A tuple of Line2D instances of the error bar caps.
barlinecols : A tuple of LineCollection with the horizontal and vertical error ranges.
If given, the following parameters also accept a string s, which is interpreted as data[s] if s is a key in data:
x, y, xerr, yerr
All other keyword arguments are passed on to the plot call drawing the markers. For example, this code makes big red squares with thick green edges:
x, y, yerr = rand(3, 10)
errorbar(x, y, yerr, marker='s', mfc='red',
mec='green', ms=20, mew=4)
where mfc, mec, ms and mew are aliases for the longer property names, markerfacecolor, markeredgecolor, markersize and markeredgewidth.
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 corresponding Line2D property for more details:
matplotlib.axes.Axes.errorbar#
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