The uni-color stripes in Linda's viewmat operator tables display fact
families. Shame to lose that.
Are zeros permitted?
( addends =: [: i. [: <. 1 1r2&p. )&.>i.11
+-+-+---+---+-----+-----+-------+-------+---------+---------+-----------+
|0|0|0 1|0 1|0 1 2|0 1 2|0 1 2 3|0 1 2 3|0 1 2 3 4|0 1 2 3 4|0 1 2 3 4 5|
+-+-+---+---+-----+-----+-------+-------+---------+---------+-----------+
( fact_family =: [: (3 A. (, -/))"1 (,. addends) )&.>i.11
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-------+
|0 0 0|0 1 1|0 2 2|0 3 3|0 4 4|0 5 5|0 6 6|0 7 7|0 8 8|0 9 9|0 10 10|
| | |1 1 2|1 2 3|1 3 4|1 4 5|1 5 6|1 6 7|1 7 8|1 8 9|1 9 10|
| | | | |2 2 4|2 3 5|2 4 6|2 5 7|2 6 8|2 7 9|2 8 10|
| | | | | | |3 3 6|3 4 7|3 5 8|3 6 9|3 7 10|
| | | | | | | | |4 4 8|4 5 9|4 6 10|
| | | | | | | | | | |5 5 10|
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-------+
Date: Wed, 14 Jan 2015 10:06:56 -0500
From: Brian Schott<[email protected]>
To: Chat forum<[email protected]>
Subject: [Jchat] Common Core Math Fact families
Message-ID:
<caedwnsvbihysuo4aqn3am92dhfbp-rm+pozdw7lisuwsuy4...@mail.gmail.com>
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
