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                    Included basic 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 "basic", there are following functions :

linspace  : creates vectors of linearly spaced values
logspace  : creates vectors of logarithmically spaced values
concath   : concatenates horizontally two arrays or vectors
concatv   : concatenates vertically two arrays or vectors

interplin : interpolates values from a couple of vectors
deriv     : derivates one vector versus one other
sort      : sorts an array

size      : gives the dimensions of an array
length    : gives the bigger dimension of an array

rem       : gives the remainder of two numbers
mod       : gives the modulus of two numbers
sgn       : gives the sign of a number
int       : gives integer part of a number
frac      : gives the fractionnal part of a number

stair     : creates an array for direct staircase plot with plotline command
bar       : creates an array for direct bargraph plot with plotline command

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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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