HP 40gs - Page 319

Matrices 18-5
To display a matrix • In the Matrix catalog ( MATRIX), highlight the
matrix name and press .
• In HOME, enter the name of the matrix variable and
press .
To display one
element
In HOME, enter matrixname(row,column). For example,
if M2 is [[3,4],[5,6]], then M2(1,2) returns
4.
To create a matrix
in HOME
1. Enter the matrix in the edit line. Start and end the
matrix and each row with square brackets (the shifted
and keys).
2. Separate each element and each row with a comma.
Example: [[1,2],[3,4]].
3. Press to enter and display the matrix.
The left screen below shows the matrix
[[2.5,729],[16,2]] being stored into M5. The
screen on the right shows the vector [66,33,11] being
stored into M6. Note that you can enter an expression
(like 5/2) for an element of the matrix, and it will be
evaluated.
Moves to the first row, last row, first
column, or last column respectively.
Key Meaning (Continued)
hp40g+.book Page 5 Friday, December 9, 2005 12:27 AM