Doc glitch

["Justin C. Walker" <justin@mac.com>]

Hi, all,

Whilst pawing through the tutorial (2.2.2, 2.2.4 both), I noticed the 
following (p. 22):
  "iv=vecindexsort(hv), then hv=vecextract(hv,iv) and 
v=vecextract(v,iv)."
'vecindexsort' seems to have a new name (vecsort); and the two calls to 
'vecextract' don't work; they both elicit the complaint

? X=vecextract(X,iv)
  ***   impossible assignment I-->S

Regards,

Justin

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