Plotting histogram question ?

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.

Answer 1

[Fangjun Jiang]

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);

[Jason]

Hi, is it possible to list down the actual percentage value for data in each container?

[Jason]

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]

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]

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]

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]

Thanks, Walter.