Let's say you're working at A & F. You're in charge of shirts, because your manager thinks you have real promise. Don't let her down!
First, you're doing inventory of red polo shirts. There are two kinds, with a logo and without a logo, and you have some of each kind in each of three sizes: small, medium and large. You count them up as follows:
With logo: 3 small, 5 medium, 4 large
Without logo: 2 small, 4 medium, 6 large
You can enter your data into a matrix to keep track of those pesky shirts where with logo is row one, without logo is row two, small is column one, medium is column two, and large is column three:
Since you're so amazing at inventory, you go ahead and count the blue polo shirts too:
With logo: 0 small, 7 medium, 1 large
Without logo: 3 small, 3 medium, 0 large
And the blue shirt matrix looks like this:
Naturally, your manager wonders how many with logo shirts there are in either color for each size. No problem!
Let's say you're a big, BIG fan of Barry Manilow. Don't worry, we won't say it to anyone else; the point is just to say it in this example. You have a collection that consists of vinyl records, 8 track tapes, cassettes, and CDs. You want to place the data about your collection into a matrix.
Let's say we want to be more detailed about our Manilow Mania. We want to list in a matrix how many of each "Greatest Hits" (1978) and "Ultimate Manilow" (2004) we have. Of the eight records there are five and 3 respectively; for 8 tracks it's 4 and 2, for cassettes 2 and 5, and for CDs it's 1 and 2.
Finally, let's suppose we bought some of each of these works on eBay and some at Julio's Retro Wonderland, and for some reason, this matters to us. For sanity's sake, let's use this shorthand: G = Greatest Hits, U =Ultimate Manilow; and E = eBay and J = Julio's place. Here are our lists:
Matrix E (our eBay purchases)
Vinyl records: 3G, 3U
Matrix J (our Julio's bargains)
Vinyl records: 2G, 0U