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                    Included wave functions for MathPad


I love MathPad, because it's simple to use, it needs small memory, and it's possible
 to have in the same document a lot of comments, calculations and results. New
version 2.5.2 brings enhancements such as copy plot at 288 dpi and possibilities to
control curves colors and makers (and othersŠ).

For these reasons, it's very easy for a teacher (for example) to make a correct
(of an exercise, an exam) with MathPad.

One problem with MathPad is that itıs very basic, and when one wants to manipulate
arrays, syntax becomes very quickly heavy and unreadable.

One big advantage of Mathpad is itıs open concept : we can build files of additional
functions and call them at the begining of one calculation file by the keyword "include".

I'm a big user of MathPad, and I made such functions in order to simplify my task.
As MathPad is free (one other big advantage), I thought it should be a good thing
that my work serves to other MathPad users.

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In the file "wave", there are following functions :

hvsd        : creates a stair heaviside signal
hvsd_tun    : creates a tunable stair heaviside signal
sqr_pls     : creates a square pulse signal
sqr_pls_tun : creates a tunable square pulse signal
dirac       : creates a dirac signal
sinus       : creates a sinus wave
square      : creates a square wave
sawtooth    : creates a sawtooth wave
slope       : creates a continuous slope signal
noise       : creates a random noise signal
noise_wh    : creates a white noise signal

add         : adds the values of two signals
inv         : inverts the polarity of the signal
mult        : multiply the values of two signals
join        : concatenates two signals
att         : attenuates or amplify a signal

lopass1     : first order low pass filter
lopass2     : second order low pass filter
hipass1     : first order high pass filter
hipass2     : second order high pass filter
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******* Problems *******

As included files are opened and evaluated simultaneously with your own calculation file,
there may have some interferences with global variables such as subscript or other.

In order to avoid that, I wrote all functions with special names for internally
used global variables :
subs_xx, cnt_xx, flg_xx, glob_xx, where xx is a number between 01 and 99.

So, the two function files (and I hope others in the future !) can be opened
simultaneously without any interference, and if you avoid these names in your
calculation files, you will have no problem.



******* Contact *******

For comments, bug report, suggestions, please contact me by email :
chevallier.dominique@free.fr

Dominique Chevallier, Toulouse, France
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