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MathGroup Archive 2008

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Bug in the front end's parser ( lst[[ ;; , 1 ]] syntax)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88243] Bug in the front end's parser ( lst[[ ;; , 1 ]] syntax)
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Tue, 29 Apr 2008 06:50:29 -0400 (EDT)
  • Organization: University of Bergen

Suppose that we want to take the third element of every sublist from the 
following list:

lst = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}

One way to do this is to use lst[[All, 3]]

Another way would be to use the new Span-syntax:

lst[[ ;; , 3]]

Unfortunately this does not work when evaluated in the front end.  It 
does work when the kernel was started on the command line.

(Both of lst[[1;; , 3]] and lst[[;;-1 , 3]] work from the front end.)



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