HP 40gs “Build Your Own” menu keys, Example: plotting a circle

hp40g+.book Page 20 Friday, December 9, 2005 1:03 AM

“Build Your Own” menu keys

Key		Meaning
		Puts the highlighted independent
		value (X, T, θ, or N) into the edit
		line. Pressing			replaces
					current value.
		this variable with its
		Inserts a zero value at the position
		of the highlight. Replace a zero
		by typing the number you want
		and pressing	.
		Sorts the independent variable
		values into ascending or
		descending order. Press
		and select the ascending or
		descending option from the
		menu, and press		.
		Toggles between two character
		sizes.
		Displays the defining function
		expression for the highlighted
		column.
		Deletes the highlighted row.
	CLEAR	Clears all data from the table.

Example: plotting a circle

Plot the circle, x 2+ y 2 = 9. First rearrange it to read

y= ±9 – x2 .

To plot both the positive and negative y values, you need to define two equations as follows:

y= 9 – x2 and y = –9 – x2

1. In the Function aplet, specify the functions.

2-20 Aplets and their views