I noticed that in the episode "Making Choices" the operators && and || are used while & and | are not introduced. I think in the examples given, these operators can be used interchangeably. Still, I wonder if it might be better to use the latter two.
The reason is that this lesson stresses vectorisation and the use of && and || can lead to unexpected results when used on vectors.
While & and | return pairwise comparisons for each vector index,
> c(T, F) & c(T, T)
[1] TRUE FALSE
&& and || compare only the first elements of both vectors. So, the fact that the second elements are not both true is missed here:
Hi there,
I noticed that in the episode "Making Choices" the operators
&&and||are used while&and|are not introduced. I think in the examples given, these operators can be used interchangeably. Still, I wonder if it might be better to use the latter two.The reason is that this lesson stresses vectorisation and the use of
&&and||can lead to unexpected results when used on vectors.While
&and|return pairwise comparisons for each vector index,&&and||compare only the first elements of both vectors. So, the fact that the second elements are not both true is missed here:See also
?base::LogicHope this is helpful. Hannes