Y-F(X) Calculator

These are the files you need. You can send them from the package contents below.

• YFUNX.EXE → A:\SOFT programa de DOS 213.5 KB

No need to put YFUNX.TXT, YFUNX.ICO: they are manuals, source code or supporting material. Read them here and save 69.0 KB on a 1 MB disk.

1. Copy YFUNX.EXE to A:\SOFT. They are DOS programs: run them from the DOS icon, or add A:\SOFT to the PATH in C:\AUTOEXEC.BAT to call them by name.

Derived from the package contents and the 200LX conventions. It installs to A: on purpose: C: is a RAM disk and every byte there is memory taken from the system.

GETTING STARTED

To begin running the YFUNX program type the command:

                          <Y> <F> <U> <N> <X> <ENTER>



A FIRST EXAMPLE

You can't perform any really useful operations (except reading the Main Menu
help screens) without first keying in a function.  So perform the first menu
item by pressing

to key in a new function.  An edit box will appear on the screen into which
you are to type your mathematical formula.  The first example function we will
enter is the straight line  Y = 2X + 3.  The asterisk character * is used to
to indicate multiplication.  Note that you do not type in the Y = part of the
formula since this program knows Y is a function of X.  Type

                          <2> <*> <X> <+> <3> <ENTER>

After pressing ENTER a brief message should appear indicating your function
formula has been accepted and the new formula should now appear at the top of
the Main Menu display screen.

                                "f(X) = 2*X+3".

We will now go the Graph Menu by pressing key


You should see a new menu labeled as the "Graph Menu".  Press key


a second time and you should see the graph of a line with slope 2 and
y-intercept 3.  It is normal for the program to sound a short beep to indicate
it is finished making a graph.  After admiring the graph press either

                                <ESC> or <ENTER>

and you should return back to the Graph Menu.  Entering and graphing most
functions is about as simple as this first example.  To return to the Main
Menu from the Graph Menu press

                                <ESC> or <ENTER>

a second time.



A SECOND EXAMPLE

For our second example we are going to enter the function  Y = 2*SIN(X).
Press key


to begin entering a new function.  Type in the following formula in the
dialog box.
…

Literal excerpt from YFUNX.TXT, exactly as it came in the package.