R-alpha: Seg.faults with complex: factor(..), unique(..). Missing feature ``sort( complex(..) )''

[Martin Maechler]

1) Several functions still (0.50 - pre6)
   give seg.faults when called with complex:

unique( 1i)  --> segfault
In 'factor', levels are defaulted to  'sort(unique(x))'
which seg.faults  factor( 1i).

Because of 'factor', table(..complex..)  seg.faults,.....


2)  sort ( complex )   [[Of course this is minor ..]]

You may not believe this can be useful, but...
I've been digging in old S-code  which makes use of this (and also of unique(.))

Be  
	z = x + 1i*y;   x,y real vectors
Then,  
	order(z)   : <-->  order(x,y)

This is how it is defined in S (but it is implemented via .Internal(..)).

One could add the following line to the definition of 'sort'

	if(is.complex(x)) return( x[order(Re(x),Im(x))] )

which has the drawback of NOT using the 'partial' and  'na.last' arguments.
((This actually makes me think that
  maybe  'order' should also accept these two)).
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