# Math 221 Current Assignment

## Due Friday, February 16

This is first use of Maple by this class, so support is especially valuable.
People may not understand the interface very well, so be prepared to explain
it. Opening up sample scratchpads (especially **Basic Linear Algebra**
from the Math 221 folder is very natural.)

The students need to produce elementary matrices for the assigment, so be
prepared to help with syntax. The command

**G := diag(1,1,1,1);**
produces a 4 by 4 identity, and then an assignment like
**G[4,1] := 3;**
would just change the entry in row 4 column 1.
One could also use copy and paste with the normal matrix creation command.

**G := matrix(3,2,[[1,2],[3,4],[5,6]]);**

## Linear Algebra Problems

**The linear algebra package needs to be loaded.**

**Better:**

**Linear algebra operations need to be wrapped inside evalm to be computed.**

**Better:**

**Scalar Multiplication uses * rather than &***

**Better:**

**Algebraically substituting in a matrix requires more than the subs function.**

**As usual, to do something to each entry of a matrix, use the ***map* function.

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Last Update: * February 9, 1996*