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MANUAL.WSF
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1979-12-31
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T A B L E O F C O N T E N T S
1. Introduction..................................................2
2. Initial Start-up..............................................2
3. Change equation...............................................2
4. Change axis...................................................3
5. Change equation and axis......................................4
6. Re-plot graph.................................................4
7. Quit..........................................................4
8. Screen dumps..................................................5
9. Errors........................................................5
Introduction
Parabola Plotter is a general-purpose program for plotting
Parabolas. Most Parabolas are plotted in under 10 seconds. It
requires Microworld Disk Basic version 6.30e. Before you start,
make sure that you have a backup copy of Parabola Plotter in your
archives.
Notation used in this manual.
<CR> Indicates that the <RETURN> key is to be pressed.
<X> Indicates that key `X' is to pressed.
Initial Start-up
Place the program disk in the A: drive. At the system prompt type
BASIC PARABOLA.MWB <CR>
After the title page has appeared, press a key. The opening menu
will appear :
P a r a b o l a P l o t t e r
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<1> Change equation
<2> Change axis
<3> Change equation and axis
<4> Re-plot graph
<Q> Quit
Please select 1-4 or Q:
Change equation
With the main menu displayed, press <1>, for "Change equation".
The screen will clear and the following will appear :
Previous equation y = x^2
This line tells you the previous equation plotted. When you
first start this will always be set to y = x^2, but will change
when you enter another equation.
Please enter the value of A, where y = A( x + b )^2 + c
or <CR> for default of 1 : -.07 <CR>
This value determines the shape of the graph. A negative value
will turn it upside down (-1, -23, -4.5) and a positive value
will make it upright (1, 13, 8.7). A large value will make
it thin (5, -16, 9.5), while a small value will make it fat
(.3, -.07, .07). Pressing <CR> will set A to its default value
of 1. Pressing <SPACE> will give A its previous value.
Please enter the value of B, where y = -0.07( x + B )^2 + c
or <CR> for default of 0 : -2 <CR>
This value determines the graph's X position. A negative value
(-2, -5, -.5) will move the graph to the right. A positive
value (4, 8, 3.5) will move the graph to the left. Pressing
<CR> will set B to its default value of 0. Pressing <SPACE>
will give B its previous value.
Please enter the value of C, where y = -0.07( x - 2 )^2 + C
or <CR> for default of 0 : 9 <CR>
This value determines the graph's Y position. A negative value
(-4, -12, -3.5) will move it down and a positive value (2, 7,
5.4) will move it up. Pressing <CR> will set C to its default
value of 0. Pressing <SPACE> will give C its previous value.
If B has not been specified, the brackets will not appear.
Are you plotting the graph of y = -0.07( x - 2 )^2 + 9
<Y>es or <N>o (Default Yes)
If this line displays the correct equation, press <CR> or <Y>.
If it isn't right, press <N> and type it in again.
The axis and scales will be drawn, and a message will be printed
telling you which equation is being plotted.
Change axis
With the main menu in front of you, type <2>, for "Change axis".
The screen will clear and the following lines will appear one at a
time on the 17th line :
To move (0,0) horizontally, type -250 to 250 or 0 centre :____
This value effects where the Y axis appears on the screen. A
negative number will move it left from the centre, a positive
number will move it right from the centre. Pressing <CR> will
set it to its default value of 0. Pressing <SPACE> will
set it to its previous value. Only integers are allowed.
To move (0,0) vertically, type -120 to 120 or 0 centre :____
This value effects where the X axis appears on the screen. A
negative number will move it down from the centre and a
positive number will move it up from the centre. Pressing
<CR> will set it to its default value of 0. Pressing <SPACE>
will set it to its previous value. Only integers are
allowed.
X - axis scale factor (Default 1) :____
This value effects the number of scale marks on the X axis. A
small number (0.5, 0.1) will increase the number of marks, a
large number (1.5, 3) will decrease the number of marks.
Pressing <CR> will set it to its default value of 1. Pressing
<SPACE> will set it to its previous value. Negative
numbers are not allowed.
Y - axis scale factor (Default 1) :____
This value effects the number of scale marks on the Y axis. A
small number (0.5, 0.1) will increase the number of marks, a
large number (1.5, 3) will decrease the number of marks.
Pressing <CR> will set it to its default value of 1. Pressing
<SPACE> will set it to its previous value. Negative
numbers are not allowed.
Confirm <Y>es or <N>o (Default Yes)
This line just asks for confirmation of the settings. If they
are wrong, press <N> and go through them again, otherwise press
<Y> or <CR>.
A message will appear telling you which equation is being plotted
and then the Parabola will be drawn.
Change equation and axis
Press <3> while in the main menu. This is the same as the
previous 2 sections put together.
Re-plot graph
Press <4> while in the main menu. This will re-plot the last
equation.
Quit
Press <Q> while in the main menu. This message will appear :
Are you sure (Y or N)
If you do wish to exit to the system, press <Y>, otherwise press
<N> to get back to the main menu.
Screen Dumps
After the graph has been plotted, a message will appear :
Press <S> for screen dump, <CR> for menu.
If you press <CR> you will return to the main menu. If you press
<S> the current graph will be dumped to a parallel printer.
Errors
Errors can occur if you type in the wrong thing. After an error
has been found, you will be returned to the main menu. Most
errors are associated with numbers that are to large. To prevent
these errors occuring, try to use small values.
Most