Wave forms on the screen
We saw the explication of the Fourier Transform of a sawtooth wave form. How
do you get the sine like wave forms into the pictures on the screen?
In the beginning this was for me as well a kind of puzzle, but a Philips
collegue gave me the free Public Domain program "WGNUplot". It is a
Windowished version of GNUplot. Click here and you get it
as a ZIP-file into your computer.
It is a command oriented program. So you have to type a command, e.g.:
Then you get an overview of the commands.
The only command that I use is:
Then a new window appears in which the graph of sine (x).
WGNUplot adjusts the axes automatically to a sensible length, but this can all be
adjusted. You can adjust e.g. the x-axis to stretch the graph in the horizontal
plot [x=0:7] sin(x)
It will say: x equals 0 to 7.
In this way you can adjust more parameters, but at a typing error in the command
you have to redo typing the command from the beginning. The more complex the
command, the more chance for typing errors. I think it's Ok very soon.
Editing as a picture
Everybody knows this of course, but for those few that don't:
How do I get the picture off my screen into a picure editor program?
This one you should just know: type "Alt - Print Scrn".
The active window, in my computer this will say a blue bar at the top, is
loaded as a picture into the clip board. Then I open the program "Paint" and
select "Edit - Paste". The whole window, including the blue bar, is then
available as a picture in Paint and can be stored as .bmp, or whatever.
After that you can do with it whatever you want. In this way I exported the
pictures above from WGNUplot.
By the way, this trick doesn't work only for WGNUplot. In the same way you can
rip pictures out of Word or PDF files as well. Adjust the scaling until the
picture fills the screen maximaly and key "Alt - Print Scrn".
Oh yes, WGNUplot can't be terminated using the little cross, it wasn't
Windowished that far. In stead of that give the command: