THE ZOOM KEY

The zoom key offers different pre-selected window settings and viewing features.

The four zoom screens are shown below. Notice the bottom row of commands change,

the top row continues to have ZOOM highlighted.  To access these screens, press GRAPH,

then F3 (ZOOM) for the first screen.  By pressing MORE, your calculator will change from

the first screen to the second screen.  By pressing MORE again, your calculator will change

to the third screen. Finally, by pressing MORE a third time, your calculator shows the final

ZOOM screen. If you press MORE one more time, your calculator returns to the first

screen shown below.

 wpe41.gif (1601 bytes)    wpe3E.gif (1589 bytes)   wpe3F.gif (1591 bytes)    wpe40.gif (1520 bytes)

F1: BOX        This feature allows you to draw a box around a selected portion of your

                   current   graph. The graph being used in this demonstration is .

                   Press the F1 (BOX) key.  Position the cursor to where you want to lock in

                   one corner.  Press the ENTER key. Now, use the arrow keys to enclose the

                   area that you want, and press ENTER again. The first image shown below

                   is before the ENTER key was pressed, and the second image is after the

                   ENTER key has been pressed.

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                 Only the portion of the graph that was enclosed in the box in the second  

                 image is shown on the entire screen of the third image.

F2: ZIn      This feature allows you to zoom in closer on a graph. When you press ZOOM

                and the F2 key, the cursor will be free floating. This means that you can move

                the cursor anywhere on the screen, not just tracing on the graph. Use the

                arrow keys to move the cursor. Once you have positioned the cursor to where

                you wish to zoom in, then press the ENTER key.   Example:

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                In the three images above, you first see the original graph, secondly where I

                moved the cursor for zooming in, and finally the graph after I had zoomed in.

F3: ZOUT   This feature allows you to zoom further out on a graph. When you press

                ZOOM and the F3 key, the cursor will be free floating. This means that you can

                move the cursor anywhere on the screen, not just tracing on the graph. Use 

                the arrow keys to move the cursor. One you have positioned the cursor to

                where you wish to zoom out, then press the ENTER key.

                Example:

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                The first graph shows the original graph, the second shows where I moved

                the cursor to zoom out, and the third graph shows the image after I zoomed

                out.

F4: ZSTD This feature is a preset window of 10 units in each direction of zero.

               To use this feature, press zoom and then the F4 key. DO NOT PRESS ENTER.

                The first two images are the window setting and graph of before

               pressing ZSTD, the third and fourth images are the range setting and

                graph after pressing ZSTD.  ZSTD is the abbreviation for Zoom Standard.

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F5: ZPREV  This is the abbreviation for Zoom Previous.  This feature returns the graph

                to the previous window settings.  To access this feature, press Zoom.  Next,

                press F5 (ZPREV).

F1: ZFIT    This feature recalculates the ymin and ymax to include the minimum and

                maximum of the function within the indicated xmin and xmax.  To access this

                feature, press ZOOM (F3).  Next, press MORE.  Finally, press F1 (ZFIT).

F2: ZSQR   This feature squares up the screen. This means that each pixel is the same

                width and height. To use this feature, press the ZOOM key.  Next, press the

                MORE key.  Finally press the F2 (ZSQR) key. DO NOT PRESS ENTER.  The

                first two images are the range setting and graph of before pressing

                ZSQR, the third and fourth images are the range setting and graph after

                pressing ZSQR.

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F3: ZTRIG This feature changes the window setting for graphing trigonometric functions.

                These settings are in RADIAN MODE.

F4: ZDECM This feature sets up the window into a "friendly" format. This means that 

                the x-values will increment by one-tenth (0.1) unit for each press of the left

                and/or right arrow key. To use this feature, press ZOOM, then the MORE key,

                and finally the F4 key.  DO NOT PRESS ENTER. If you press ENTER, the

                graph is placed in a pause mode.   To release the graph from the pause

                mode, you will need to press enter again.  Example:

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                The first screen shown above is the graph of on the ZDECM

                screen. The second image is the window setting that the calculator set 

                when ZDECM was selected. ZDECM  is the abbreviation for Zoom Decimal.

F5: ZDATA  This feature adjusts the xmin and xmax to display all the data entered in

                the statistical features of the calculator.  The ymin and ymax are not adjusted.

                This feature is used after first constructing a STAT PLOT.  Next, access the

                ZOOM command by pressing GRAPH and then the ZOOM key (F3).  Press the

                MORE key once.  Finally press the F5 key (ZDATA).   

F1: ZRCL    This feature recalls a window setting that has been stored under ZSTO.  ZRCL

                is the abbreviation for Zoom Recall.  To access this feature, first press ZOOM.

                Secondly, press the MORE key twice.  Finally, press F1 (ZRCL).  ZSTO is

                discussed at a point further down this page.   You will need to store your

                window setting before you can recall the window setting.

F2: ZFACT  ZFACT is the abbreviation for Zoom Factors.  This feature displays the zoom

                factors for your calculator.  You can change the factors by accessing the

                feature and typing in the new x-factor, pressing either ENTER or a down

                arrow and typing in the new y-factor.  These factors determine the enlargement

                and reduction of the Zoom In (ZIN) and Zoom Out (ZOUT) screens.  To access

                this feature, press ZOOM.  Press the MORE key twice.  Finally, press F2

                (ZFACT).

F3: ZOOMX  The ZOOMX feature zooms out just the x-axis.  For instance, if the x-factor

                was previously set to 4.  The standard screen (ZSTD) has an xmin of -10 and

                a xmax of 10.  When you activate ZOOMX, the xmin and the xmax values are

                multiplied by 4 giving a result of xmin = -40 and xmax = 40.  The vertical axis

                is not changed in this feature.  To access the feature, press ZOOM.  Next,

                press the MORE key twice.  Finally, press F3 (ZOOMX) and the ENTER key.

F4: ZOOMY  The ZOOMY feature zooms out just the y-axis.  For instance, if the y-factor

                was previously set to 4.  The standard screen (ZSTD) has an ymin of -10 and

                a ymax of 10.  When you activate ZOOMY, the ymin and the ymax values are

                multiplied by 4 giving a result of ymin = -40 and ymax = 40.  The horizontal

                axis is not changed in this feature.  To access the feature, press ZOOM. 

                Next, press the MORE key twice.  Finally, press F4 (ZOOMY) and the ENTER

                key.

F5: ZINT   This feature multiplies each setting of your current window setting by a

                factor of 10.  To access this feature, press the ZOOM key (F3).  Press the

               MORE key twice.  Press ZINT (F5) key and finally, the ENTER key.  ZINT is the

               abbreviation for Zoom Integer.

F1: ZSTO  This feature stores a window setting that may be recalled by pressing ZRCL.

               ZSTO is the abbreviation for Zoom Store.  To use this feature, first key in

               the window setting that you want under the WIND (window) command. 

               Then, press the ZOOM key (F3).  Press the MORE key three times. Finally,

               press the F1 key (ZSTO).   The calculator will graph the equation using the

               window settings.  Later, should you decide that you want to use these same

               settings, use the ZRCL command access that setting. 

Return to the Graphing Menu.