Classwork April 1, 2008 by Josh H.

What we did in class 4/ 1/ 08 was:

Finish Up 3/ 31/ 08 classwork- Monday's classwork in excell.
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Warm Up Problems
(4-1-08) Tuesday

1. Is matrix multiplication commutative? Prove using examples.



2. Multiply the following matrices

| 4 6 8 |
| 3 17 9 |
| 7 17 21 | | 21 26 32 39 |
| 6 22 32 | * | 24 27 34 40 |
| 8 15 55 | | 25 28 37 41 |


Upload Problems!
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Finish Friday's and Monday's claswork.
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Next Scribe 4/ 3/ 08 Thursday is Patrick W.

Ipiphani's Scribe for Monday, March 31, 2008

Correction for Important Notes For Multiplying matrices in Excel:
1. You must name you matrices/arrays (Upper left corner of Formula Bar)
2. Highlight where you want your result to go.
3. Go to Insert Function, click Math & Trig., then MMULT (Matrix Multiplication)
4. Name your Arrays, then Press and hold (all together) control + shift + enter to fill your array


Scribe for next class is JOSH H.

Concepts I don't understand

I don't really understand Sin, Cos, and Log. Well, I understand them somewhat but I think that I may need to be refreshed on what they are exactly and how to do them.