[R] making groups

[jim holtman]

It would be nice if you could supply an example of what your input
looks like and then what you would like your output to look like.  You
would probably use 'tapply', but I would have to see what you data
looks like.

On 7/9/07, Mag. Ferri Leberl <ferri.leberl at gmx.at> wrote:
> Dear everybody!
> If I have an array of numbers e.g. the points my students got at an
> examination, and a  key to group the numbers, e.g. the key which
> interval corresponds with which mark (two arrays of the same length or
> one 2x(number of marks)), how can I get the array of absolute
> frequencies of marks?
> I hope I have expressed my problem clearly.
> Thank you in advance.
> Mag. Ferri Leberl
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?