Subj : any function to handle this kind of counting?
To   : comp.programming
From : Ross
Date : Sat Jul 30 2005 12:30 am

Dear all,

i have generated a 2000 X 1 vector, e.g.


1
3
2
1
1
3
2
1
1
4
....

and this vector indeed has a corresponding vector, e.g.

A
A
A
A
C
C
E
E
....

and then i want to count, say, for "1", there are two A's, one E, ...

it seems that a for loop can do the job but as we don't know how many 
instances there are, i.e. don't know A, C, E and then what will occur in 
this corresponding vector, is there any function which is devoted to handle 
this kind of counting problem? thx!!

.