Re: Anyone used the Notation package in v6 already?
- To: mathgroup at smc.vnet.net
- Subject: [mg77295] Re: Anyone used the Notation package in v6 already?
- From: Donald DuBois <dfd01 at comcast.net>
- Date: Wed, 6 Jun 2007 07:19:37 -0400 (EDT)
Hello,
lst = {{1, 0}, {1, 1}, {2, x + x^2 + x^4}, {2, 1 + x + x^2 + x^4}, {4,
x + x^2}, {4, 1 + x + x^2} ... }
First /@ lst // Tally
will produce
{{1, 2}, {2, 2}, {4, 10}, {5, 8}, {8, 10}}
which is the number of 1's, 2's, 4's etc. as the first element of the sublists.
In a little less cryptic form,
Tally[Map[First , lst]]
Will accomplish the same thing.
Regards,
Don