""" Show how to modify the coordinate formatter to report the image "z" value of the nearest pixel given x and y """ import numpy as np import matplotlib.pyplot as plt import matplotlib.cm as cm X = 10*np.random.rand(5,3) fig = plt.figure() ax = fig.add_subplot(111) ax.imshow(X, cmap=cm.jet, interpolation='nearest') numrows, numcols = X.shape def format_coord(x, y): col = int(x+0.5) row = int(y+0.5) if col>=0 and col<numcols and row>=0 and row<numrows: z = X[row,col] return 'x=%1.4f, y=%1.4f, z=%1.4f'%(x, y, z) else: return 'x=%1.4f, y=%1.4f'%(x, y) ax.format_coord = format_coord plt.show()