plotting the histogram of data points

please consider this sample code:

 figure
 data = [0,2,9,2,5,8,7,3,1,9,4,3,5,8,10,0,1,2,9,5,10];
 hist(data)

Why this histogram plots the data points 0 & 1 with frequency 4 (on Y-axis),when in fact 0 & 1 appear two times in data.

Answer 1

[Azzi Abdelmalek]

data = [0,2,9,2,5,8,7,3,1,9,4,3,5,8,10,0,1,2,9,5,10];
d=unique(data)
y= histc(data,d) 
bar(d,y)

Look at

help hist

N = hist(Y) bins the elements of Y into 10 equally spaced containers and returns the number of elements in each container

help histc

[Ved]

@Azzi:Thank You !

Answer 2

[Walter Roberson]

You have 11 different values (0 through 10) but only 10 bins (default number to use if you do not specify the number in a hist() call).