pyqtgraph prolbem

gistfile1.py

## Create window with two ImageView widgets
win = QtGui.QMainWindow()
win.resize(800,800)
win.setWindowTitle('pyqtgraph example: DataSlicing')
cw = QtGui.QWidget()
win.setCentralWidget(cw)
l = QtGui.QGridLayout()
cw.setLayout(l)

dummy_plot=  pg.PlotItem(title='Pilatus image')

dummy_plot.enableAutoRange()

imv1 = pg.ImageView(view=dummy_plot )


# imv1 = pg.ImageView()
pw = pg.PlotWidget()
pw2 = pg.PlotWidget()
pw3 = pg.PlotWidget()

# imv2 = pg.ImageView()
l.addWidget(imv1, 0, 0)
l.addWidget(pw, 1, 0)
l.addWidget(pw2, 2, 0)





win.show()

roi = pg.LineSegmentROI([[10, 64], [120,64]], pen='r')
imv1.addItem(roi)

data = data_array

def update():
    global data, imv1, pw, roi
    pw.clear()
    pw2.clear()
    d2 = roi.getArrayRegion(data_array, imv1.imageItem, axes=(1,2))
    
    pw.plot(d2[0],pen=roi.pen)
    pw2.plot(d2[1],pen = [5,8])

roi.sigRegionChanged.connect(update)


imv1.setImage(data_array, xvals=data_df.Time )#, axes=  {'t':2, 'x':0, 'y':1, 'c':3},transform=)

update()