Unfortunately errorbar
can't do this, but you can create a PatchCollection
from your error data which can easily be added to the axes. See this quick script for an example of how you could do this.
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.collections import PatchCollection
from matplotlib.patches import Rectangle
# Number of data points
n=5
# Dummy data
x=np.arange(0,n,1)
y=np.random.rand(n)*5.
# Dummy errors (above and below)
xerr=np.random.rand(2,n)
yerr=np.random.rand(2,n)
# Create figure and axes
fig,ax = plt.subplots(1)
# Plot data points
ax.errorbar(x,y,xerr=xerr,yerr=yerr,fmt='None',ecolor='k')
# Function to plot error boxes
def makeErrorBoxes(xdata,ydata,xerror,yerror,fc='r',ec='None',alpha=0.5):
# Create list for all the error patches
errorboxes = []
# Loop over data points; create box from errors at each point
for xc,yc,xe,ye in zip(xdata,ydata,xerror.T,yerror.T):
rect = Rectangle((xc-xe[0],yc-ye[0]),xe.sum(),ye.sum())
errorboxes.append(rect)
# Create patch collection with specified colour/alpha
pc = PatchCollection(errorboxes,facecolor=fc,alpha=alpha,edgecolor=ec)
# Add collection to axes
ax.add_collection(pc)
# Call function to create error boxes
makeErrorBoxes(x,y,xerr,yerr)
# Add some space around the data points on the axes
ax.margins(0.1)
plt.show()
Drawing squares is really easy with matplotlib.patches
, eg:
import matplotlib.pyplot as pl
import matplotlib.patches
pl.figure()
ax = pl.gca()
ax.add_patch(
matplotlib.patches.Rectangle(
(1.0, 1.0), # x, y
2.0, # width
2.0, # height
color='r', alpha=0.5
) )
ax.set_aspect(1)
pl.xlim(0,4)
pl.ylim(0,4)
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