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discuss dimension dropping #13

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kevinushey opened this issue Nov 6, 2013 · 1 comment
Open

discuss dimension dropping #13

kevinushey opened this issue Nov 6, 2013 · 1 comment

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@kevinushey
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m <- matrix(1:9, nrow=3)

class( m[1:2, ] ) ## matrix!
class( m[1, ] ) ## integer!

Useful when you're expecting it, the cause of difficult to trace bugs when you're not. The terribly wonderful syntax

m[1, , drop=FALSE]

allows you to avoid dimension dropping explicitly.
@kevinushey
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Similarily, why apply is evil (always drops dimensions if the function applied returns a scalar*)

*vector of length one

@kevinushey kevinushey mentioned this issue Nov 18, 2013
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@kevinushey