Plotting histogram question ?

2011 8 13
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How do I plot the histogram of a set of data values in terms of percentage of cumulative frequency? Something like, I want the range to be from 0 to 100%, not from 0 to total number of data.
I am not sure if I made myself understood. Please do ask for details if you need any.

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Fangjun Jiang
Fangjun Jiang 2011-8-13

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a=rand(100,1);
a(a>=0.7)=1;
a(a<=0.2)=2;
a(a<0.7 & a>0.2)=3;
figure(1);n=hist(a(:),0:5);
percent=n/sum(n);
figure(2);bar(0:5,percent);

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Jason
Jason 2011-8-13
Hi, is it possible to list down the actual percentage value for data in each container?
Jason
Jason 2011-8-13
I actually have to plot this for all the values within a 4-D cell array. There are 59,500 values in total, I need to know the cumulative frequency of those values. Maybe I need to use 'cumsum'?
Fangjun Jiang
Fangjun Jiang 2011-8-13
a=rand(2,3,4,5);
figure(1);hist(a(:),0:0.1:1);
n=hist(a(:),0:0.1:1);
figure(2);bar(0:0.1:1,n/sum(n));
Jason
Jason 2011-8-13
What am I thinking, the answer is clearly in the code you wrote. Sorry, my mind is so cluttered right now. Thanks for the help though, very much appreciated.
Walter Roberson
Walter Roberson 2011-8-13
Warning: the logic used above will fail if there are no values to be histogrammed. sum(n) would be 0 and you would get 0/0 . Be safe, program defensively!
Jason
Jason 2011-8-13
Thanks, Walter.

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