[R] How do I assign boolean (o,1) values to a column?

[Bert Gunter]

Hi:

On Mon, May 23, 2011 at 7:52 AM, CAR <acasusa at gmail.com> wrote:
> Hi everybody!!
>
> I'm trying to assign boolean values to a column in a matrix depending on the
> number of times present in another column. I have no clue,

Sorry, I don't have time to help. But have you read "The Introduction
to R" tutorial where you might find sufficient info to help you solve
problems like this? It's well written (IMHO) and not too long (also
IMHO).

Cheers,
Bert

I have been 2
> days looking for a way, if somebody knows what kind of functions I need to
> use I will really apreciate it.
>
> example:
>
> Color Type  Mark1 Mark2 Mark3
> Red   high    139    P       alpha
> blue   low    140    P        alpha
> Green high   141    S       alpha
> Yellow low    142   S        beta
> Red    high   143    P       gamma
>
> If we only take into account columns Mark1, Mark2 and Mark3. I would like to
> ask R to write another column with 0=one; 1=more than one.
> If alpha is present for more than one Mark 2, so P and S, then I will like
> to assign value 1 if only for one then assign the value 0.
>
> Thanks for your help
>
>
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>
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-- 
"Men by nature long to get on to the ultimate truths, and will often
be impatient with elementary studies or fight shy of them. If it were
possible to reach the ultimate truths without the elementary studies
usually prefixed to them, these would not be preparatory studies but
superfluous diversions."

-- Maimonides (1135-1204)

Bert Gunter
Genentech Nonclinical Biostatistics