How to define the bin size for a histogram

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upinderjeet
upinderjeet 2014-9-20
评论： upinderjeet 2014-9-20
Hello
I have 2 questions.
I am trying to create 100 bins for my histograms which covers actually 10000 data points. The command bincounts = histc(x,binranges), allows me to put the binranges value but I dont want to repeat (0 100 200..........10000)as the value for 'binranges'. So is there any shorter way to give that kind of argument for binranges to use that command. Once I know that, I can use bar(binranges,bincounts,'histc') to plot the histogram.
Second question, how do I normalize the area of the histogram to be 1.
Thanks

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Guillaume
Guillaume 2014-9-20
There are two histogram functions in matlab. The other one, hist allows you to specify the number of bins instead of the edges.
As for normalising:
dist = hist(data, 100);
dist = dist / sum(dist);
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upinderjeet
upinderjeet 2014-9-20
Hi, one more question:
I am using the following code:
X=rand(10000,1);
[N,centers] = hist(X, 100);
N = N / sum(N); figure(1)
bar(centers, N); %or plot
xlim([min(centers) max(centers)]);ylim([0 1]);
Y=pdf('uniform',X,0,1);
figure(2)
plot(Y)
I am not getting the normalized area of 1. The method you told me gives me normalized x axis of the plot but I want the total area to be 1 as well. Like, If i am able to expand the histogram plot vertically(multiply by 100), I would get area of 1. But not really sure how to achieve this. Please run my code to see my problem

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