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PERIYODA.TXT
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1991-03-17
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PERIYODA
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PERIYODA - Periodic Function Movies, ver.2.0, 1991
Z. Juricskay, Cs. Markus, P. Pacher, G. Mark
Physical Institute of the Technical University
H-1111 Budapest, Budafoki u.8. Hungary
This program is an aid for making and re-playing
"movies" that demonstrate physical and mathematical
models.
There are many physical processes that can be described
by simple formulas which present nearly exact pictures of the
real world, for example, two-dimensional waves.
Using PERIYODA anyone can design two dimensional time
dependent (periodic) - F(x,y,t) - functions and display them
in films. These films are about two or three seconds
long and they are even close to TV-quality in speed!
Possible educational uses:
- It can show the process of occurences that can't be
shown easily.
- In physics there are problems that can't be demonstrated
any other way.
- Certain aperiodical phenomena can also be demonstrated.
- It can demonstrate which parts of the mathematical
model are identical with reality and which parts are
different.
- In mathematics: It can teach two-dimensional functions,
the meaning of parameters, ...
- After an exam it can demonstrate incorrect solutions, so
anyone can see the problems with that. It is much better
than the well-known red ink.
Experiments can be planned, films can be made before the
lesson, so logical scenes need not be interrupted by changing
equipment. The students can make their own movies using their
own functions so they can solve their problems without any
help. It can be an example for learning-as-a-game in
mathematics!
There are several options that can be changed:
- the function
- minimum and maximum value of the x, y parameter
- the step of the x, y parameters
- the time step
- the axonometry
- the number of the phases - in our opinion it must be at
least 20-30 to create a nice "movie"
- the indicator of the time that can be a clock or just
the number of the actual phase
Using the menu is easy: the movement of the MOUSE or the
UP and DOWN keys move the highlighted bar; the ENTER
key or the left button on the MOUSE chooses the menu-point
which can give a new menu; the ESC key or the right
button of the MOUSE forces the program to leave that new
menu; and the F1 button activates the HELP anywhere. To
leave the program, choose QUIT in the FILE-MENU or just press
ALT and X together.
Watching a film you can use UP and DOWN key to slow
down or quick up re-playing and ESC to leave this option.
Editing a text LEFT , RIGHT , INSERT , HOME , END functions
are available. To accept the string just press ENTER and to
go back to last point press the ESC button.
The DIRECTORY function is really easy-to-use: LEFT ,
RIGHT , PGUP , PGDN , HOME and END functions help you to
find the file you are intrested in.
Starting the program the user can see the screen divided
into three parts:
- the main part (and the biggest one) is the movie-window:
film creation and re-playing take place here. There is
a polygon showing the axonometry and a short line
delineating the height of the function-interval in
points.
- the menus that are on the left side of the screen.
- the icons showing the options of our new film.
Icons demonstrate the minimum and maximum value of the
two variable (x and y), the minimum value and the period of
the time, the number and the indicator of the phases.
Any kind of inscription can be changed easily, because
they can be found - with the EGA and VGA colours and the
whole structure of the MENU - in different files attached to
the program.
PERIDEMO is a restricted version of PERIYODA, only the LOAD,
PLAY, PLAY-FROM-MEMORY and - of course - QUIT work as
described; other menupoints give their HELP by choosing them.
System requirements:
▐ IBM PC, XT, AT or compatible computer
▐ at least 640 Kbyte RAM memory
▐ CGA, EGA (or VGA) or HERCULES graphics card
▐ a floppy drive or a hard disc
▐ if possible: MICROSOFT or compatible MOUSE
PERIYODA and the DEMO version is made by:
Zoltán Juricskay & Csaba Márkus
Pécs, Sárvár,
Olga u. 13. Szatmár u. 4.
H-7632 H-9600
HUNGARY HUNGARY
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