matlab 统计总结

TABLE = TABULATE(X), where X is a character array or a cell array
of strings, returns TABLE as a cell array

a =

1     2     3     4     2     3     1

>> x = tabulate(a)

x =

1.0000    2.0000   28.5714
2.0000    2.0000   28.5714
3.0000    2.0000   28.5714
4.0000    1.0000   14.2857

>> x(:,1:2)

ans =

1     2
2     2
3     2
4     1

N = HIST(Y) bins the elements of Y into 10 equally spaced containers
and returns the number of elements in each container.  If Y is a
matrix, HIST works down the columns.

N = HIST(Y,M), where M is a scalar, uses M bins.

N = HIST(Y,X), where X is a vector, returns the distribution of Y
among bins with centers specified by X.  Note: Use HISTC if it is
more natural to specify bin edges instead.

a =

1     2     3     4     2     3     1

>> b = hist(a,unique(a))

b =

2     2     2     1

>> [unique(a)' b']

ans =

1     2
2     2
3     2
4     1