How to convert extremely small exp values to 0?-CodePudding

I'm doing Gram-Schmidt Orthogonalization process. At some point I'm getting output 3D vectors with values extremely small. Basically the values are zeros. How to deal with values such as -3.5527136788005009 * 10^-15? How to convert them to zero or compare if it is almost zero?

CodePudding user response：

You asked "How to convert them to zero?" If you want to convert extremely small values to zero you can use a simple if statement:

const double delta = 0.000000001;
if (x < delta && x > -delta) { x = 0; }

CodePudding user response：

I did research on my old code and I've found this little func:

static const double eps = 1e-10;

bool isZero(double value) const
{
    return std::abs(value) <= eps;
}