None values in pyqtgraph

Question

I am trying to make a graph from a data which includes null value (data from pandas) using pyqtgraph.

pyqtgraph - yellow circle has null values

graph using excel

i want the graph using pyqtgraph to be the same as the excel graph. in other words there will be no line in the region with null values.

Answer 1

Use yourcurve.setData(x, y, connect="finite")

Set data in plotcurveitem/plotdataitem has the keyword connect which does exactly what you are looking for.

To cite from the documentation about the connect keyword:

Default is all, indicating full connection. pairs causes only even-numbered segments to be drawn. finite causes segments to be omitted if they are attached to nan or inf values. For any other connectivity, specify an array of boolean values.

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Here is an example

import numpy as np
import pyqtgraph as pg
from PyQt4 import QtCore

a = np.array([1, 2, 3, np.nan, 5, 6, 7, np.nan, 9, 10, 11])
b = np.array([1, 2, 3, np.nan, 3, 2, 1, np.nan, 1, 2, 3])
c = b+3

w = pg.PlotWindow()
finitecurve = pg.PlotDataItem(a, b, connect="finite", pen=(255, 255, 0))
normalcurve = pg.PlotDataItem(a, c, pen=(255, 0, 0))
w.addItem(normalcurve)
w.addItem(finitecurve)
w.show()

if __name__ == '__main__':
    import sys
    if sys.flags.interactive != 1 or not hasattr(QtCore, 'PYQT_VERSION'):
        pg.QtGui.QApplication.exec_()