1# -*- coding: utf-8 -*- 2""" 3Demonstrates basic use of ErrorBarItem 4 5""" 6 7import initExample ## Add path to library (just for examples; you do not need this) 8 9import pyqtgraph as pg 10from pyqtgraph.Qt import QtGui, QtCore 11import numpy as np 12 13import pyqtgraph as pg 14import numpy as np 15 16pg.setConfigOptions(antialias=True) 17 18x = np.arange(10) 19y = np.arange(10) %3 20top = np.linspace(1.0, 3.0, 10) 21bottom = np.linspace(2, 0.5, 10) 22 23plt = pg.plot() 24plt.setWindowTitle('pyqtgraph example: ErrorBarItem') 25err = pg.ErrorBarItem(x=x, y=y, top=top, bottom=bottom, beam=0.5) 26plt.addItem(err) 27plt.plot(x, y, symbol='o', pen={'color': 0.8, 'width': 2}) 28 29if __name__ == '__main__': 30 pg.exec() 31