r - Going from multiple dummy variables to a single variable -

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How do I n are mutually exclusive in a data frame that I can take the dummy variable and Do they include a single variable? In the following example, 

  K & lt; - data. Frames (H = sample (C (T, F), 100, T)) ifelse (k $ H == T, F, sample (C (T, F)) - & gt; K $ kk $ u & lt; - ifelse (k $ H == T | k $ k == T, F, T)   
 A simple way of them to convert a variable  i   h ,  k  or  u  with the level of?  
 To do this I think with that you can do  ifelse  etc., as in this example, but I have my data file several hundred dummy and I manually I am also lazy for.  
 
 - The name (k) [applied (k, 1, joe)]   
 will transform Bull into a dummy variable.

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