HP 40G manual 728 672?

To display a matrix

To display one element

To create a matrix in HOME

To store one element

•In the Matrix catalog ( >6+ )7@MATRIX), highlight the matrix name and press (',7_.

•In HOME, enter the name of the matrix variable and press >(17(5@.

In HOME, enter matrixname(row,column). For example, if M2 is [[3,4],[5,6]], then M2(1,2) >(17(5@ returns 4.

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 >(17(5@ 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.

In HOME, enter:

value 672?_￿matrixname(row,column)

For example, to change the element in the first row and second column of M5 to 728, then display the resulting matrix:

728672?_￿

>$/3+$@M5>￿@1>￿@2>￿@ >(17(5@>$/3+$@M5 >(17(5@.

An attempt to store an element to a row or column beyond the size of the matrix results in an error message.

Matrices 12-5