Re: [Numpy-discussion] missing data: semantics

2011-06-30 Thread Charles R Harris
On Thu, Jun 30, 2011 at 11:51 AM, Matthew Brett wrote: > Hi, > > On Thu, Jun 30, 2011 at 6:46 PM, Lluís wrote: > > Ok, I think it's time to step back and reformulate the problem by > > completely ignoring the implementation. > > > > Here we have 2 "generic" concepts (i.e., applicable to R), plus

Re: [Numpy-discussion] missing data: semantics

2011-06-30 Thread Charles R Harris
On Thu, Jun 30, 2011 at 11:46 AM, Lluís wrote: > Ok, I think it's time to step back and reformulate the problem by > completely ignoring the implementation. > > Here we have 2 "generic" concepts (i.e., applicable to R), plus another > extra concept that is exclusive to numpy: > > * Assigning np.N

Re: [Numpy-discussion] missing data: semantics

2011-06-30 Thread Matthew Brett
Hi, On Thu, Jun 30, 2011 at 6:46 PM, Lluís wrote: > Ok, I think it's time to step back and reformulate the problem by > completely ignoring the implementation. > > Here we have 2 "generic" concepts (i.e., applicable to R), plus another > extra concept that is exclusive to numpy: > > * Assigning n

[Numpy-discussion] missing data: semantics

2011-06-30 Thread Lluís
Ok, I think it's time to step back and reformulate the problem by completely ignoring the implementation. Here we have 2 "generic" concepts (i.e., applicable to R), plus another extra concept that is exclusive to numpy: * Assigning np.NA to an array, cannot be undone unless through explicit ass