Abstract
The so-called quotient-difference algorithm, or qd-algorithm, is used for determining the poles of a meromorphic function from its Taylor coefficients. A generalization of this algorithm to the univariate and multivariate two-point cases applied to a power series (positive or negative exponents) is presented. We describe also the symbolic-numeric two-point qd-algorithm to compute the poles of multivariate meromorphic functions in a given domain from its series expansion coefficients. This algorithm can be regarded as computing the parametrized eigenvalues for a tridiagonal matrix. Numerical examples are furnished to illustrate our results.
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The work of the first author is supported by a CNRST Scientific Scholarship.
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Elidrissi, A., Abouir, J. & Benouahmane, B. On the calculation of the poles of multivariate meromorphic functions using the symbolic-numeric two-point qd-algorithm. Numer Algor 84, 1443–1458 (2020). https://doi.org/10.1007/s11075-020-00887-9
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DOI: https://doi.org/10.1007/s11075-020-00887-9