2. WHAT IS A MATRIX?
A group of numbers arranged in rows
and columns.
Its numbers are called entries or
elements.
The dimensions are:
# of rows x # of columns
Example:
This matrix has dimension 2 x 3
3. SPECIAL MATRICES
Name Description Example
Row Matrix only 1 row
Column Matrix only 1 column
same # of rows
Square matrix
and columns
all entries are
Zero Matrix
zeros
4. COMPARING MATRICES
Two matrices are equal if their dimensions
are the same and corresponding entries are
equal.
Are these equal?
5. ADDING AND SUBTRACTING MATRICES
Dimensions must match!
Add or subtract corresponding entries.
Examples:
Not Possible!
7. MULTIPLYING BY A SCALAR
Scalar – a regular number
Scalar multiplication – multiplying a
matrix by a scalar
Just multiply each entry by the scalar!
Example: