void bitsetDivide(std::bitset<N> x, std::bitset<N> y,
std::bitset<N>& q, std::bitset<N>& r)
{
if (y.none( )) {
throw std::domain_error("division by zero undefined");
}
q.reset( );
r.reset( );
if (x.none( )) {
return;
}
if (x == y) {
q[0] = 1;
return;
}
r = x;
if (bitsetLt(x, y)) {
return;
}
// count significant digits in divisor and dividend
unsigned int sig_x;
for (int i=N-1; i>=0; i--) {
sig_x = i;
if (x[i]) break;
}
unsigned int sig_y;
for (int i=N-1; i>=0; i--) {
sig_y = i;
if (y[i]) break;
}
// align the divisor with the dividend
unsigned int n = (sig_x - sig_y);
y <<= n;
// make sure the loop executes the right number of times
n += 1;
// long division algorithm, shift, and subtract
while (n--)
{
// shift the quotient to the left
if (bitsetLtEq(y, r))
{
// add a new digit to quotient
q[n] = true;
bitsetSubtract(r, y);
}
// shift the divisor to the right
y >>= 1;
}
}
float Apriori::calc_support(std::bitset<NUM> bsdata)
{
float support = 0.0;
unsigned count = 0;
std::bitset<NUM> b;
/*
* 1. std::map<unsigned ,IndexBitSet_t> m_base_dataset;
* (data,vec float) -> (data,bitset)
* */
if(bsdata.none()) return 0.0;
for(auto iter = this->m_base_dataset.begin();
iter!= this->m_base_dataset.end(); iter++){
b.reset();
b |= (this->m_bitset_vec[iter->second] & bsdata) ^ bsdata;
if(b.none()) count++;
}
support = (count*1.0) / (this->m_base_dataset.size() * 1.0);
return support;
}
inline void evaluateResultConditions(std::bitset<bit_width> const& result) {
if (result.none())
this->setFlag(FLAGS::Zero);
if (result.test(bit_width - 1))
this->setFlag(FLAGS::Negative);
}
