HP 50g Graphing Calculator - Using the EquationWriter - Part 2

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HP 50g Graphing Calculator - Using the EquationWriter - Part 2

The EquationWriter

One of the most useful built-in applications of the HP50g is the EquationWriter. This is the best environment for writing, editing and mathematically manipulating formulae. The EquationWriter allows quick and easy work that is very difficult or even impossible to do from the command line. It displays formulae in textbook format, allowing a much easier recognition of terms than the command line since the need to keep track of parentheses is reduced to a minimum. In addition, all commands for formula manipulation can be used, making thus the EquationWriter to a full flavoured environment for work with algebraic objects.

You access the EquationWriter with

Figure : Accessing EquationWriter

The blinking arrow is the cursor of the EquationWriter. Anything you write is placed at the position of the cursor. The menu items in brief are:

EDIT : Allows to edit a sub expression separately in the command line.

CURS: Switch cursor modes

BIG: Switch font used for display

EVAL: Evaluate sub expression

FACTOR: Factor sub expression

SIMP: Simplify sub expression

(Second menu page)

CMDS: Display the CAS commands catalogue

HELP: Get help for the CAS commands

You can display any menu from inside the EquationWriter, select some of its commands and place it in the EquationWriter (if it is the command is a function allowed in algebraic objects). You can also apply some command from any menu to a sub expression in the EquationWriter, if the command returns one algebraic object.

In the following examples we practise using the features of the EquationWriter to write, edit, and mathematically manipulate expressions.

Practice manipulating formulae in the EquationWriter

Example 1:

Write the expression below in the EquationWriter:

Solution:

Assume RPN mode and soft menus. Start the equation writer.

Figure : Starting the equation writer

Begin writing the formula

Figure : Inserting formula into the equation writer

The sub expression

has to be written another two times. Select it and copy it.

Figure : Copying the formula

The EquationWriter has switched to a special mode that allows easy selection of sub expressions. The cursor changed to cross hairs. The selected sub expression is variable X of the sine function. Press

and hold the key pressed until the cursor doesn't move any more. Release the key. Now the sub expression is selected that we want to copy.