Monthly Archives: January 2010

Groupings, Shopping Lists, Vectors: part 19

In this post, I will try to connect a set of equations with matrices and vectors in a way that isn’t simply a notational shift.  In part 18 of this series, I brought up the vast preponderance of square matrices … Continue reading

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Groupings, Shopping Lists, Vectors: part 18

If you have read earlier installments of this series – and I know it has gotten long – you may have noticed that very few of the matrices that appeared there have the same number of rows and columns.  A … Continue reading

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Groupings, Shopping Lists, Vectors: part 17

In this post I will show a full-fledged matrix multiplication done in a spreadsheet, Excel.  (This series starts here; two recent posts part 15 and part 16 introduce vector inner products done in Excel.) Above you see one approach, though … Continue reading

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Groupings, Shopping Lists, Vectors: part 16

This has become a long series, and we’re not done yet.  Here is where we started, looking for natural models that give power and flavor to the mathematical idea of a vector.  Since then, we’ve looked at vector inner products, … Continue reading

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Groupings, Shopping Lists, Vectors: part 15

This post is  part of a series, starting here, about models and ideas that underlie the rather abstract stuff called vectors and matrices in math textbooks.  In this series, we’ve looked at shopping lists, pricing out orders, weighted averages, perspective … Continue reading

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Groupings, Shopping Lists, Vectors: part 14

In the prior parts of this series, I have look at a number of problem situations from which a certain notion of grouping data and organizing data and operating on data arises straightforwardly, a way of grouping data that is … Continue reading

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Groupings, Shopping Lists, Vectors: part 13

In prior posts in this series we have seen two completely different kinds of applications for the idea of matrix multiplication: in part 11 we looked at pricing out an order, and in part 12 we looked at drawing a … Continue reading

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