DiffEQ Solver

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

• INSTALL.EXE → A:\SOFT programa de DOS 34.0 KB
• ODE.EXE → A:\SOFT programa de DOS 176.2 KB

No need to put README, ODE25.DOC, PENDULUM.ODE, AIRY.ODE, BINARY.ODE, DUFFING.ODE, EULER.ODE, SINE.ODE and 27 more: they are manuals, source code or supporting material. Read them here and save 28.7 KB on a 1 MB disk.

1. Copy INSTALL.EXE, ODE.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.

INSTALLATION

   To install the program on a hard disk, type the following at the DOS
prompt:

cd\
a:install

and follow the directions on the screen.  This will install the main program,
and several sample programs. (These have the extension .ODE)


GETTING STARTED

   Type ODE at the DOS prompt to start the program.   The ODE main menu will
appear.


Try the following:

F3
    (to start an ODE file.)

firsttry
    (ODE will create a new file of this name, because one does not
     currently exist.  ODE will then place you in the text editor.
     Enter the following text:)

# exponential growth
y  = 1
a  = 1
y' = a*y
<Esc>

    (Pressing the escape key quits the editor and compiles the program.
     If you have made any errors ODE will place you back in the editor.
     Press <Esc> and correct the error.

    This system has the solution y(t)=exp(at).  The first equation sets the
    initial value of y, the second sets the parameter a, the third defines the
    differential equation.  The first line is a comment.  Spaces are ignored,
    so you may use them freely to make the equations more readable.)

F4
   (i.e. solve. This solves the equation over the default range (0,1).)

any key
   (to exit from graph mode)

F9
   (to examine the current values of the variables. Y should be
    e=2.7182818...)

   (to edit your program. Change line 3 to a=1, 0.5, 0.2. Use <Esc> to quit
   the editor.)

F4
   (The solution will now be graphed with the three different values of a.)



THE MAIN MENU

The most important main menu options are the following:

E - invokes the built-in text Editor.

F - File submenu.
    L allows loading a previously created File, or creating a new file if the
    name entered is not in the default directory.

F3 - Loads a file into the editor.

…

Literal excerpt from ODE25.DOC, exactly as it came in the package.