Matplotlib.pyplot.errorbar() in Python

21 Apr, 2020
Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. Pyplot is a state-based interface to a Matplotlib module which provides a MATLAB-like interface.
The errorbar() function in pyplot module of matplotlib library is used to plot y versus x as lines and/or markers with attached errorbars.
Syntax: matplotlib.pyplot.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)
Parameters: This method accept the following parameters that are described below:
x, y: These parameter are the horizontal and vertical coordinates of the data points.
fmt: This parameter is an optional parameter and it contains the string value.
xerr, yerr: These parameter contains an array.And the error array should have positive values.
ecolor: This parameter is an optional parameter. And it is the color of the errorbar lines with default value NONE.
elinewidth: This parameter is also an optional parameter. And it is the linewidth of the errorbar lines with default value NONE.
capsize: This parameter is also an optional parameter. And it is the length of the error bar caps in points with default value NONE.
barsabove: This parameter is also an optional parameter. It contains boolean value True for plotting errorsbars above the plot symbols.Its default value is False.
lolims, uplims, xlolims, xuplims: These parameter are also an optional parameter. They contain boolean values which is used to indicate that a value gives only upper/lower limits.
errorevery: This parameter is also an optional parameter. They contain integer values which is used to draws error bars on a subset of the data.
Returns: This returns the container and it is comprises of the following:
plotline:This returns the Line2D instance of x, y plot markers and/or line.
caplines:This returns the tuple of Line2D instances of the error bar caps.
barlinecols:This returns the tuple of LineCollection with the horizontal and vertical error ranges.
Below examples illustrate the matplotlib.pyplot.errorbar() function in matplotlib.pyplot:
Example #1:
# Implementation of matplotlib functionimport numpy as npimport matplotlib.pyplot as plt  # example dataxval = np.arange(0.1, 4, 0.5)yval = np.exp(-xval)  plt.errorbar(xval, yval, xerr = 0.4, yerr = 0.5)  plt.title('matplotlib.pyplot.errorbar() function Example')plt.show()
Output:
Example #2:
# Implementation of matplotlib functionimport numpy as npimport matplotlib.pyplot as plt   fig = plt.figure()x = np.arange(10)y = 3 * np.sin(x / 20 * np.pi)yerr = np.linspace(0.05, 0.2, 10)   plt.errorbar(x, y + 7, yerr = yerr,             label ='Line1')plt.errorbar(x, y + 5, yerr = yerr,             uplims = True,              label ='Line2')plt.errorbar(x, y + 3, yerr = yerr,              uplims = True,              lolims = True,             label ='Line3')  upperlimits = [True, False] * 5lowerlimits = [False, True] * 5plt.errorbar(x, y, yerr = yerr,             uplims = upperlimits,              lolims = lowerlimits,             label ='Line4')   plt.legend(loc ='upper left')  plt.title('matplotlib.pyplot.errorbar()\function Example')plt.show()
Output:
Python-matplotlib
Python
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