How to create a histogram plot with unequal bins?
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LS,
I would like to generate a histogram plot for a dataset which is like:
a= [-99999999 -2 -2 -2 -1 -1 0 0 0 1 1 2]
When I use the normal hist function
hist(a)
only two bars are shown; one for the outlying value and one for the values around zero. The details of the values around zero disappear in the graph. Is there a way to avoid this? Can I generate bins from -2 to 2 and a separate bin for everything smaller than -3?
Your help is really appreciated.
Best regards,
Frits Hermans
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Laura Proctor
am 26 Mai 2011
b = -3:2; % specify bin centers
n = hist(a,b) % generate numbers to populate bins
bar(b,n) % plot the resultant histogram
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the cyclist
am 26 Mai 2011
In your case, I think you probably want to use histc(), not hist(). Then, you can specify that you want your first (left-most) bin edge to be -2.
Then, set the XLim property such that you see only the extent of the plot that you want to.
Walter Roberson
am 26 Mai 2011
Specify the first bin as negative infinity to catch all of the outliers.
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the cyclist
am 26 Mai 2011
You can specify the bins precisely, using either the hist() or histc() functions. May I recommend a careful read of the documentation, which spells out how to do this.
>> doc hist
>> doc histc
Specifically, look at the syntax
>> hist(Y,x)
which specifies the locations of the centers of the bins, or
>> histc(Y,edges)
which specifies the locations of the edges.
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