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Plot and histrogram


I have the next question, after doing some operation I obtained a matrix from an image that I want to plot in an histogram. I used the next function. I am using python +opencv3.0.0:

hist = cv2.calcHist([result],[0],None,[256],[0,256])

But it gives me the following error:

TypeError: images data types = 17 is not supported

What's wrong??? Any ideas???

Thanks in advance.