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A question about command of hist?

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qmriso

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i am a starter about image processing in the university.i wrote a histogram program.and i want to match the program if it is true.so i want to use hist command and control the truth.but i cant run the hist command.can you help me?

normally i plot like this:

k=1:256;
plot(w(k),k)

w(k) is a array 1 to 256.w(1) includes the number of zeros in my matrix.and w(256) includes the number of 255s.

thanks.
 

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