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 * Classpad 330 CAS Calculator ** toc

=** Graphing **=

**Getting started**
Go to the Graphs & Tables Screen by clicking on third icon down in the main menu. (Graphs & Tables).

You should see a screen like the one to the right.

The top half is where you enter the equations to be graphed.

The lower half is where your graph will appear.

You can enter many equations at once.

To draw the graph of a particular equation, the little square on the very left of the line has to be ticked.

Start off by entering an equation to be graphed into the little box to the right of y1

Don't type "y = ", when you start typing, the calculator will change "y1 :" to "y1 ="

For example, enter x^2 – 2 and the calculator will show y1 = x^2 – 2.

NB You can use the 2D tab of the virtual keyboard here to make the equation look nicer. Put a tick in the box to the left of y1 Then click on the graph icon on the left of the icon bar.

Your graph should appear in the bottom half of the screen.

The Menu bar and Icon bar will be different depending on which half of the screen is active.

You can change the active screen by clicking in the desired half of the screen or by clicking on the icon on the left of the icon bar (graph icon or Y1 icon)

You can use the Resize and Swap icons in the green bar at the bottom to view a fullscreen version of the active screen.

If your graph does not fit neatly into the window, you may need to use one of the options in the ZOOM menu (visible when the graph screen is active)

or

You can set the specific scale you want for the x-axis and the y-axis by clicking on the rescale icon (4th from the left)

Analysing your Graph
You can find out some basic things about your graph using commands in the ANALYSIS menu, GSOLVE submenu.

Alternatively, click on the little side arrow at the right end of the icon bar and you will see some icons that do the same thing.

{For all of these commands, if you have two or more graphs showing on the screen at once, the calculator will first put a flashing cursor on one of the graphs. Use the blue up and down arrows to cycle through the graphs until it is on the one you want and then press EXE}

Root : will give you the x-interceps. Use the blue side arrows to switch between different x-intercepts when there are more than one.

Max : will give a local maximum.

Min : will give you a local minimum

y-intercept : will give you a y-intercept

intersect : will give you the points where two graphs intersect.

y-cal : allows you to enter an x-coordinate and will calculate the y value for you

x-cal : allows you to enter a y-coordinate and will calculate the x value for you (blue side arrows to switch between different values)

inflection : will give you a point of inflection (where the curve changes from concave down to concave up - eg on a cubic).

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