Does anyone know which function (if any) will return the index of the
true locations in a Boolean vector?

 

For instance:

A=c(1,3,5,7,4);

B=c(2,4,77,3,3);

X=A<B;

 

So X is:

> X

[1]  TRUE  TRUE  TRUE FALSE FALSE

 

I'd like to know if there is a function that will tell me the locations
of where the TRUE values are?  for instance a vector that will list that
the locations are at 1, 2, 3.  This function is sometimes called loc()
in other languages.

 

Thanks,

Jennifer

 


 

 

 


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