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Hello all,
I've written some math usefull library ! here is my work. It's not
really optimized and I'm afraid cause I see the memory place down ...
If someone want help me ...
Have fun
nanobapt
/*test.c*/
#include <math.h>
#include <conio.h>
int main()
{
lcd_int(sin(PI)*1000);
return 0;
}
-----
/*math.h*/
#define PI 3.1415
/*
*puiss(2, 3) == 2^3
*/
extern float puiss(float nb, int deg);
/*
*factor(5) == 5!
*be aware taht the RCX can't calculate foctor like 20! :)
*/
extern int factor(int n);
/*
*Precision is not really good but enought for the RCX
*/
extern float sin(float x);
extern float cos(float x);
----
#include <math.h>
float puiss(float nb, int deg)
{
int i;
float total=1;
for(i=0; i<deg; i++)
{
total=total*nb;
}
return total;
}
int factor(int n)
{
int i;
int total=1;
for(i=1; i<=n; i++)
total=total*i;
return total;
}
float sin(float x)
{
int i;
float total=0;
for(i=0; i<3; i++)
total=total+( puiss(-1, i)*(puiss(x, 2*i+1)))/factor(2*i+1);
return total;
}
float cos(float x)
{
return (1-2*puiss(sin(x/2), 2));
}
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Message has 1 Reply:
 | | Re: math.h
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| Oh note : you need to compile with -lfloat your kernel if you want to include it into kernel just add -lfloat to $LIBS in the Makefile.kernel nanobapt (21 years ago, 6-May-03, to lugnet.robotics.rcx.legos)
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