Computing Integrals Involved the Gaussian Function with a Small Standard Deviation

  • Yunyun Ma
  • Yuesheng XuEmail author


We develop efficient numerical integration methods for computing an integral whose integrand is a product of a smooth function and the Gaussian function with a small standard deviation. Traditional numerical integration methods applied to the integral normally lead to poor accuracy due to the rapid change in high order derivatives of its integrand when the standard deviation is small. The proposed quadrature schemes are based on graded meshes designed according to the standard deviation so that the quadrature errors on the resulting subintervals are approximately equal. The integral in each subinterval is then computed by considering the Gaussian function as a weight function and interpolating the smooth factor of the integrand at the Chebyshev points of the first kind. For a finite order differentiable factor, we design a quadrature scheme having accuracy of a polynomial order and for an infinitely differentiable factor of the integrand, we design a quadrature scheme having accuracy of an exponential order. Numerical results are presented to confirm the accuracy of these proposed quadrature schemes.


Integral involved the Gaussian function Small standard deviation Graded meshes 

Mathematics Subject Classification



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Authors and Affiliations

  1. 1.School of Computer Science and Network SecurityDongguan University of TechnologyDongguanPeople’s Republic of China
  2. 2.Department of Mathematics and StatisticsOld Dominion UniversityNorfolkUSA
  3. 3.School of Data and Computer Science, and Guangdong Province Key Lab of Computational ScienceSun Yat-sen UniversityGuangzhouPeople’s Republic of China

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