another counting question

["Leeds, Mark" <mleeds@mlp.com>]

thank you to all the people who wrote

back to me about my counting question.

 

basically, everyone gave variants of a similar solution

which was to use the function in Splus called table().

 

now, i have a somewhat more difficult question.

i'm sorry to bother everyone with so

many questions but i think this will

be my last one for a while.

 

i have one vector that is a list of strings.

 

say c("AAA","BBB","CCC","BBB","CCC")

 

and another vector that is a list of numbers

that is the same length as the vector above.

 

so it might be

 

c(0.10,0.20,0.34,0.50,0.60)

 

so, given the string vector above,i would want to return

 

0.1, 0.7, 0.94, 0.7, 0.94 as the resulting vector.

 

in other words, whenever the strings are the same,

it should add those numbers up and put them

in the corresponding position. i don't think table can be used

here but maybe there is some other function that does this ?

 

if making the string vector the names of the columns of

the number vector helps accomplish the task, that

is fine. i just don't want to loop.

 

                                                                thanks

 

 

                                                                    mark