gausser

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gausser is a C++ class for calculating the Gaussian faster.

Problem

You want to calculate the Gaussian often. You could do so with this function:

double gauss(const double x, const double sd) noexcept
{
  return std::exp(-(x*x) / (2.0 * sd * sd));
}

In your code, the value of sd is constant, so you could precalculate these values. gausser is exactly such a class.

Example

int main()
{
  //The standard deviation of the Gauss curve
  const double sd{1.0};

  //Create the lookup table
  const gausser g(sd); 

  //The value we want to get the Gaussian of
  const double x{2.0};

  //We get the Gaussian of x
  const double y{gauss(x, sd)};

  //The Gaussian of x is close to the expected value
  assert(std::abs(y - 0.135335283237) < 0.0001);
}

Contributing, code guidelines

See CONTRIBUTING.