Probabilty occurence of a number in long number sequence

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tusu 2012-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/51162-probabilty-occurence-of-a-number-in-long-number-sequence

Hiee

Is matlab has any function to count prob of occurrence of a particular no iin a long data sequence?

i.e. if I have 300 numbers ..all the the numbers varies from 0 to 255..then if no 8 occurs 3 times in the sequence,,then probability occurrence for 8 shall be 3/300.How can I calculate this in matlab? how can I plot this data in matlab

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Answer 1

Matt Fig 2012-10-18

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编辑：Matt Fig 2012-10-18

在 MATLAB Online 中打开

X = randi(256,1,300)-1;       % Data on [0 255]
P = histc(X,0:255)/length(X); % Probabilities.
[(0:255).' P(:)]  % Show the probabilities.
plot(0:255,P)

If you only want to see the probabilities that are nonzero:

Y = 0:255;
Y = Y(logical(P));
P = P(logical(P));
[Y(:) P(:)]

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tusu 2012-10-18

Thanx it works for me..now what if I do go to a 3d plot i.e. my prob of occurrence is on z axis and I like to divide my 300 data which varies form 0 to 255 i.e. 8bit data..I wan to plot it along X axis and Y axis...by taking 4 bit of each 8 bit...

is it possible ..mu hurdle is how to divide the no is axis wise suppose the no is 225 so in binary it shall be 1110 0001 now how can I plot this 225 along X and Y axis?

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