Java何时可以产生NaN？

Z时代
2024-01-10
分类：问答

我知道JavaDouble.NaN是什么。我有一些产生的Java代码NaN。

// calculate errors
delta = m1 + m2 - M;
eta = f1 + f2 - F;
for (int i = 0; i < numChildren; i++) {
  epsilon[i] = p[i]*m1+(1-p[i])*m2+q[i]*f1+(1-q[i])*f2-C[i];
}
// use errors in gradient descent
// set aside differences for the p's and q's
float mDiff = m1 - m2;
float fDiff = f1 - f2;
// first update m's and f's
m1 -= rate*delta;
m2 -= rate*delta;
f1 -= rate*eta;
f2 -= rate*eta;
for (int i = 0; i < numChildren; i++) {
  m1 -= rate*epsilon[i]*p[i];
  m2 -= rate*epsilon[i]*(1-p[i]);
  f1 -= rate*epsilon[i]*q[i];
  f2 -= rate*epsilon[i]*(1-q[i]);
}
// now update the p's and q's
for (int i = 0; i < numChildren; i++) {
  p[i] -= rate*epsilon[i]*mDiff;
  q[i] -= rate*epsilon[i]*fDiff;  
}