probability of occurence of a specific value

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Camilla Santicoli
Camilla Santicoli 2015-3-10
评论： Camilla Santicoli 2015-3-10
Hi all! I have a question concerning the probability of occurence of a specific value. I have a set of precipitation data and would like to find the frequency histogram for precipitation values equal to zero. is there someone here who is able to solve this easy problem? :) thank you

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回答（3 个）

Image Analyst
Image Analyst 2015-3-10
Have you looked into the histogram functions?
Or fitting routines like polyfit() or more sophisticated tools in the Curve Fitting Toolbox?
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Camilla Santicoli
Camilla Santicoli 2015-3-10
yes but I don't know how to say to the hisotgram function to plot only values equal to zero...because usually it asks me to define a range of values in which I want the plot

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Guillaume
Guillaume 2015-3-10
You must have at least two bins for the histogram functions, you could just set the threshold of the second bin to something very small:
h = histc(data, [0 0.00001]);
But if you really just want the number of values equal to 0:
num0 = sum(data == 0);
%or num0 = sum(abs(data < 0.00001)) if you want to include values very close to 0
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Guillaume
Guillaume 2015-3-10
moreover I would like to plot a relative frequency histogram instead of the normal one
I assume that's what you want:
precipitationhistogram = precipitationhistogram / sum(precipitationhistogram);
Or use the new histcounts:
precipitationhistogram = histcounts(filteredprecipitation, [0 0.1 1 3 10 Inf], 'Normalization', 'probability');
Camilla Santicoli
Camilla Santicoli 2015-3-10
really thank you for youranswer! I solved the problem:)

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Camilla Santicoli
Camilla Santicoli 2015-3-10
ok I understood it! but the plot doesn't work...
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Guillaume
Guillaume 2015-3-10
I'm replying in a comment to my original answer
Camilla Santicoli
Camilla Santicoli 2015-3-10
yes that's perfect! thank you very much! do you also know how to plot it with relative frequency?

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