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.
Parameters:
x, y: float or array-like
The data positions.
xerr, yerr: float 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 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.
fmt: str, default: ”
The format for the data points/data lines. See plot for details.
Use ‘none’ (case-insensitive) to plot errorbars without any data markers.
ecolor: color, default: None
The color of the errorbar lines. If None, use the color of the line connecting the markers.
elinewidth: float, default: None
The linewidth of the errorbar lines. If None, the linewidth of the current style is used.
elinestyle: str or tuple, default: ‘solid’
The linestyle of the errorbar lines. Valid values for linestyles include {’-’, ’—’, ’-.’,
’:’, ”, (offset, on-off-seq)}. See Line2D.set_linestyle for a complete description.
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.
barsabove: bool, default: False
If True, will plot the errorbars above the plot symbols. Default is below.
lolims, uplims, xlolims, xuplims: bool or array-like, default: False
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!
errorevery: int or (int, int), default: 1
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.
Returns:
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.
Other Parameters:
data: indexable object, optional
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
﹡﹡kwargs
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: