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#include <math.h>

#include "vector.h"

const double v_zero[2] = {0, 0};

void v_copy(const double* x, double* y)

{

y[0] = x[0];

y[1] = x[1];

}

void v_axpy(double a, const double* x, double* y)

{

y[0] = a * x[0] + y[0];

y[1] = a * x[1] + y[1];

}

void v_scal(double a, double* x)

{

x[0] *= a;

x[1] *= a;

}

void v_mul(const double* x, double* y)

{

y[0] *= x[0];

y[1] *= x[1];

}

void v_div(const double* x, double* y)

{

y[0] /= x[0];

y[1] /= x[1];

}

double v_dot(const double* x, const double* y)

{

return (x[0] * y[0] + x[1] * y[1]);

}

double v_nrm2(const double* x)

{

return sqrt(v_dot(x, x));

}

double v_normalize(double* x)

{

double l;

l = v_nrm2(x);

l = EPSILON < l ? l : 0;

v_scal((0 < l ? 1.0/l : 0), x);

return l;

}