
                            INSTRUCTIONS 
How do I select and edit a function? 
1)  From the main menu, select option 'F' to edit F(x).  
2)  Use the up and down arrow keys to select one of five function
    types. 
3)  Use the left and right arrow keys to select constants that you
    wish to change.  Look at the bottom of the editing screen to tell
    you what size and type of constant you may enter.  Notice that at
    the top of the editing screen a simplified version of your
    function is written and updated as you change various constants. 
    After you write a constant using the number keys, you may enter
    it by either pressing a right or left arrow key or by pressing
    the enter key.  It is usually faster to use the arrow keys. 
    Multiplying a term by zero makes it disappear.  Raising a
    variable to the zero power makes it disappear and it is replaced
    by one.  When you enter a coefficient to a large number of
    significant digits, it is rounded for presentation on the screen
    but the full accuracy is retained for calculating the values of
    the function.  Exponents must be entered as either single digit
    integers or as the fraction of two single digit integers such as
    -3/2.  You cannot enter decimal exponents.
4)  You can edit G(x) in the same way as F(x).  After you have edited
    F(x) and G(x), select H(x) by using the up and down arrow keys. 










***************************** IMPORTANT ****************************
On some menu screens and displays, there are no instructions about
what to do after you finnish with the menu or display.  If there are
no instructions, press the enter key!  Pressing the enter key either
once or twice will allow you to continue on with the program.  
********************************************************************








How do I save my work and manipulate the math function files? 

Except that the file names are different, the file menu looks much
like this:

    First, select a file by using the arrow keys: 

        CON3_10     CON3_11     CON3_12     CON3_13     CON3_2       
        DEFAULT     ELLIPSE     EXPO4_1     EXPO4_2     EXPO4_3     
        EXPO4_4     EXPO4_5     EXPO4_6     EXPO4_7     SPIROL      
        STANDARD    TAN         TRIG3_1     WITCH


    Next, select an option by entering its number:

      Create ..... 1    Delete ..... 2      Rename ..... 3      
      Load ....... 4    Main menu .. 5      Quit ....... 6







1)  It is often a good idea to create a new file and load it before
    you start editing and plotting functions.  Do this by selecting
    option 'I' from the main menu.  Then, select option '1' from the
    file menu.  You will be asked to enter a name for your new file. 
    After you enter the name, the new file name is listed with the
    other files.  Load your file by pressing the return key.  You are
    then returned to the main menu.  The name of the file currently
    loaded appears on the main menu in option 'J' which is the save
    option.  Remember this, when you create a file the contents of
    whatever file is currently loaded will be the contents of the
    newly created file.  After the file is created, you may edit and
    save your new file as you please.  
2)  Load an existing file by selecting option 'I' from the main menu. 
    Then, use the arrow keys to highlight the desired file.  If you
    press any one of the following keys: 4 (Load), 5 (Main menu) or
    enter, the file is automatically loaded and you are returned to
    the main menu with the name of the selected file appearing in
    option 'J'.  (There is no particular advantage to using any one
    of the methods but the options seem to help people get started.)




3)  There are two ways to save a file.  The first way is to select
    option 'J' from the main menu.  The second way is to select
    option 'K' from the main menu which allows you to change plot
    parameters.  When you return to the main menu from this option,
    the current file is automatically saved.  The 'STANDARD' file is
    an exception.  It cannot be saved or deleted. 
4)  Delete a file by selecting option 'I' from the main menu. Then,
    use the arrow keys to highlight the file that you wish to delete. 
    Press the delete option number at this point and the file is
    automatically deleted.  You can not delete the 'DEFAULT' and 
    'STANDARD' files.
5)  Rename a file by selecting option 'I' from the main menu.  Next,
    use the arrow keys to highlight the file that you wish to rename. 
    Then, press the rename option, number 3.  At this point, you are
    asked to enter a name to replace the old one.  After you enter
    the name, the changed file name will appear among the others and
    the old name will be gone.  
 





How do I plot math functions? 
  Functions are plotted by selecting one of the options L, M, N, or O
  from the main menu.  You can change the plot parameters by selecting
  option K and editing the plot parameters.  
1)  The first four parameters of the plot parameter menu determine
    the plotting ranges of the independent and dependent variables.
2)  The fifth parameter determines the number of points to be plotted
    and consequently the time required and the detail of the plot.
3)  The sixth parameter determines the type of plot (elliptic, polar
    or rectangular).  For elliptic coordinates, a value for the
    seventh parameter (distance between foci of the ellipses) is
    required and the range of the first four parameters is limited.
4)  The last option can be used to return the user to the main menu. 
    When ever you return to the main menu from the plot parameter
    menu, the current function file is automatically saved.

How can I terminate a plot if it is not turning out to be the desired
one?
  A plot may be terminated by pressing the enter key.  



How might I start using the program?  
From the main menu, do the following: 
1)  Calibrate the screen by selecting option 'C'. 
2)  Select option 'I' which gives you the file menu then create a
    file.
3)  Select option 'F'.  Select and edit F(x). 
4)  Select option 'G' and then select and edit G(x). 
5)  Select option 'H' and then select H(x). 
6)  Select option 'K'.  Change the various plotting parameters
    including the type of coordinate grid that seems appropriate for
    your functions.  
7)  Select option 'N' to automatically plot F(x), G(x) and H(x). 
8)  Save your function file using option 'J'. 

What does option 'P' from the main menu do?
  It draws various geometric figures.  Press the enter key to freeze
  a figure. 
