Pie chart help

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Njöng
Njöng 2011-12-6
Let´s say I have a vector x = [1 1 2 2 2 3 3 3 3] I want to make a pie chart that shows the frequency of each number. In this case, it would be divided into three slices and the slice representing number 3 would be the biggest etc. Is that possible? Thanks in advance. /Njööööng

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Walter Roberson
Walter Roberson 2011-12-6
http://www.mathworks.com/help/techdoc/ref/pie.html
More specifically: use hist() or histc() to count the number of items of each type and pass that count vector to pie as the X value. Pass text representations of each element in the labels parameter.
e.g.,
u = unique(x);
counts = histc(x, u);
pie(counts, cellstr(num2str(u(:))) )
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Walter Roberson
Walter Roberson 2011-12-6
num2str() fixed.
Njöng, notice that I did not pie(x), I used pie(counts) where counts is the result of the histc(). There would be 3 values in count so there would be 3 slices, each with area proportional to the _number_ of values in that bin.
Njöng
Njöng 2011-12-8
Sorry, young man, I mustve misread your post, Im an old lady, you see :)
Next question: Is there a way to insert a legend and label the slices?

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