This allows you to select and then plot a previously defined function.
This is used to select a previously defined function.
This will plot a previously selected function. When the surface has been drawn, a flashing cursor appears in the upper left hand side of the screen. Three keys are then recognized:
ESC which returns you to the main menu
B which first draws the axes and then the boundary
P which prints the graph to the selected printer.
This allows you to change some of the viewing parameters "by eye". After you have selected a function to view, a set of axes is drawn. To change the viewing angle use the 4 arrow keys. To see/hide the function boundary, press "b".
To see/hide a constant x slice, press "x".
To see/hide a constant y slice, press "y".
The keys on either side of "x" and "y" ("z", "c", "t", and "u") move these slices.
To move the eye in/out, press "i" or "o".
Pressing F1 shows a summary of these commands.
This displays the current parameters according to which the function will be graphed. To exit from the summary press ESCAPE. If you move the cursor (with the up and down arrow keys) and press return over a highlighted option you will go to the corresponding entry under the PARAMETERS menu.
Farewell!
This shows which function you have selected to plot.
This is a typical help screen.
Don't forget to press ESCAPE to remove a help screen.
This is where you create functions. If you press the INSERT key, a partial list of eligible functions is displayed. You can select and edit these, or create your own from scratch.
There are two points to remember.
The symbol for exponentiation is ^, so that 10^2 = 100.
To define a function f(x,y) such that
g(x,y) if (x,y)
(a,b),
f(x,y) =
c if (x,y) = (a,b)
disc(x,y,a,b,c){f(x,y)}
This allows you to delete a function.
This allows you to edit a function.
This allows you to look at the created function. You can also select a function for plotting from this menu.
This is where you can create, delete, and edit functions.
Allows you to load previously saved functions from disk.
Allows you to save created functions to disk.
Allows you to change disk drives.
Allows you to change directories on the current drive.
Gives various disk information, viz. the current drive, the current directory, and the total and remaining free space on the current drive.
Lists all the files in the current directory.
This is where functions are saved and loaded, and other disk oriented chores are performed.
This allows you to identify the graphics printer hooked up to your system. The choice is simple - either EPSON compatible, or LASERJET. Sorry, we have NO PLANS to extend this list!
These are the instructions you should have read when you first ran the program.
The brave people who did all the work.
Miscellaneous operations which don't belong anywhere else.
Allows you to select the bounds on x and y.
Allows you to choose how many grids are plotted in the x and y directions. The limits are from 1 to 30. The more you choose the slower the program runs, but the better the representation.
This allows you to select where the eye is located. You can do it as (x,y,z) or (r,
). In the latter case
is the angle in the xy-plane from the x-axis, and
is the angle down from the z-axis. These can also be selected "by eye", by going to the PLOT FUNCTIONS menu and then SELECT VISUALLY.
This is the (x,y,z) coordinate that you are looking at from the eye's location. The default is the origin.
This allows you to decide whether those parts of the surface which are behind other sections are hidden or displayed. Hidden is usually better, but is much slower. The best thing to do is display these lines until you have the correct view, and then hide them for your final plot.
This re-initializes all the parameters to the values when the program first started.
Allows you to select where the surface is viewed from, how much of the surface is diplayed, how fine the surface grids are, whether bakground lines are to be hidden.
(.txt)