Program Lines:

Description:

(In RPN mode)

 

  

 "!1L2

   L

 !   ! 

This routine collects all known values in three equations.

Prompts for and stores a number into the variable addressed by i.

Adds 1 to i and repeats the loop until i reaches 13.012.

When i exceeds the final counter value, execution branches back to A.

Label J is a loop that completes the inversion of the 3 3 matrix.

Program Lines:

Description:

(In RPN mode)

 

  

 !ª1L2    L  !   !

This routine completes inverse by dividing by determinant.

Divides element.

Decrements index value so it points closer to A Loops for next value.

Returns to the calling program or to  !.

Equations with (i)

You can use (i) in an equation to specify a variable indirectly. Notice that 1L2 means the variable specified by the number in variable i (an indirect reference), but that i or 1L2 means variable i.

The following program uses an equation to find the sum of the squares of variables

Athrough Z.

13–24Programming Techniques

Page 208
Image 208
HP 33s Scientific manual Equations with, 13-24Programming Techniques