Comments on: Groupings, Shopping Lists, Vectors: part 17 http://unlearningmath.com/2010/01/24/groupings-shopping-lists-vectors-part-17/ math as a garden, friendly and always new Tue, 20 Dec 2011 20:42:50 +0000 hourly 1 http://wordpress.com/ By: Groupings, Shopping Lists, and Vectors: The Series « Learning and Unlearning Math http://unlearningmath.com/2010/01/24/groupings-shopping-lists-vectors-part-17/#comment-459 Sun, 12 Sep 2010 04:31:02 +0000 http://unlearningmath.com/?p=1494#comment-459 [...] Groupings, Shopping Lists, and Vectors – part 17 – showing matrix multiplication in a regular pattern using Excel [...]

]]> By: Bob Phillips http://unlearningmath.com/2010/01/24/groupings-shopping-lists-vectors-part-17/#comment-270 Wed, 03 Feb 2010 08:52:30 +0000 http://unlearningmath.com/?p=1494#comment-270 In the first layout, you could just use

=SUMPRODUCT(INDEX($C$4:$E$11,,ROW(A1)),$G$4:$G$11)

and with the second form, you can use this array formula

=SUM(TRANSPOSE(B13:I13)*K$4:K$11)

]]> By: Groupings, Shopping Lists, Vectors: part 18 « Learning and Unlearning Math http://unlearningmath.com/2010/01/24/groupings-shopping-lists-vectors-part-17/#comment-261 Thu, 28 Jan 2010 01:11:23 +0000 http://unlearningmath.com/?p=1494#comment-261 [...] models, naming, representations, whole vs. parts by Bert Speelpenning If you have read earlier installments of this series – and I know it has gotten long – you may have noticed that very few of [...]

]]> By: Groupings, Shopping Lists, Vectors: part 17 « Learning and Unlearning Math http://unlearningmath.com/2010/01/24/groupings-shopping-lists-vectors-part-17/#comment-259 Wed, 27 Jan 2010 23:49:58 +0000 http://unlearningmath.com/?p=1494#comment-259 [...] models, naming, representations, whole vs. parts by Bert Speelpenning If you have read earlier installments of this series – and I know it has gotten long – you may have noticed that very few of [...]

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