Jon Harrop wrote:
Xah Lee wrote:
Kaz Kylheku wrote:
Really? ``50 or hundreds'' of lines in C?
#include <math.h> /* for sqrt */
void normalize(double *out, double *in)
{
double denom = sqrt(in[0] * in[0] + in[1] * in[1] + in[2] *
in[2]);
out[0] = in[0]/denom;
out[1] = in[1]/denom;
out[2] = in[2]/denom;
}
Doh?
Kaz, pay attention:
Xah wrote: «Note, that the “norm” as defined above works for vectors
of any dimention, i.e. list of any length.»
That is still only 6 lines of C code and not 50 as you claimed:
double il = 0.0;
for (int i=0; i<n; ++i)
il += in[i] * in[i];
il = 1.0 / sqrt(il);
for (int i=0; i<n; ++i)
out[i] = il * in[i];
Not that it matters, but the above requires C99 (or C++).
Arne
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