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

[CAR]

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, 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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