pyqtgraph/examples/ViewLimits.py

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import initExample ## Add path to library (just for examples; you do not need this)
from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph as pg
import numpy as np
plt = pg.plot(np.random.normal(size=100), title="View limit example")
plt.centralWidget.vb.setLimits(xMin=-20, xMax=120, minXRange=5, maxXRange=100)
if __name__ == '__main__':
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pg.exec()