#3 math.h

[Anonymous]

A maths library is urgently needed for BrickOS. Someone
has already had a go at:
http://news.lugnet.com/robotics/rcx/legos/?n=3269

This only includes a few functions.
I would expect a full version of math.h to include the
following mathematical functions:

sine
cosine
tangent
natural log (ln)
absolute value of a number (makes a number positive)
factorial (!)
square root

[Nobody/Anonymous]

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By the way, my email is: clarkrjk at yahoo dot com

[William J Koontz]

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I have some functions to add to this.
I got these power series formulas from math sites and converted
them to C for brickOS.
I tested them with a spreadsheet using Excel's SERIESSUM
function.
I have a spreadsheet and a jpg of a graph made with
OpenOffice (I deleted windows so don't use excel anymore!)
it compares the OpenOffice calc sine and cosine function
values with the ones calculated with these power series, out
to the same number of iterations I used in these BrickOS
functions. The inverse functions and square root are
similar in accuracy which is pretty good. We can credit
Isaac Newton, and a few other mathmatical genuises for the math.
The jpg is here: http://billkoontz.com/files/rcxmath.jpg
The spreadsheet which was created in excel needs to be
doctored up before I can edit it correctly in OpenOffice,
since I used some charting features apparently not yet
available in OpenOffice :( I'll post it on my website when I
trim it down.
I'll also continue working on this and try to add the other
functions you mentioned, factorial and log should be easy, I
thought I did ABS once but can't find it, hmmm....

[William J Koontz]

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OOPS, forgot to put a link to the code!!!! DUH!!!
Its also on my website: http://billkoontz.com/robots.html
Just go here theres links to all that I mentioned....