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c1c77bd64a
This is for developing methods of implementing geometric algebra and eventually playing with it visually.
37 lines
633 B
R
37 lines
633 B
R
#include "metric.h"
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@implementation Metric
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+(Metric *)R:(int)p, int m, int z
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{
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Metric *metric = [[[Metric alloc] init] autorelease];
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metric.plus = (1 << p) - 1;
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metric.minus = ((1 << m) - 1) << p;
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metric.zero = ((1 << z) - 1) << (p + m);
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return metric;
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}
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static double
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count_minus (unsigned minus)
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{
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double s = 1;
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while (minus) {
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if (minus & 1) {
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s = -s;
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}
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minus >>= 1;
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}
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return s;
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}
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-(double)apply:(unsigned) a, unsigned b
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{
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// find all the squared elements
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unsigned c = a & b;
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// any elements that square to 0 result in 0
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if (c & zero) {
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return 0;
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}
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return count_minus (c & minus);
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}
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@end
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