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Feng Cheng Chang


Allwave Corporation

Last seen: plus d'un an il y a |  Actif depuis 2008

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Professor, Senior Scientist, Ph. D. in E.E., University of Alabama, IEEE Life member, Retired Professional Interests: mathematics, EM waves, Antennas

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A soumis


Simplifying the built-in function [q,r]=deconv(b,a)
Create an efficient function [q,r]=deconc_e(b,a) to eliminate the undesired data that resulted from running the existing built-i...

plus de 5 ans il y a | 1 téléchargement |

A soumis


Function of square matrix: fA=fsm(fx,A)
Given: f(x)= function of x, and A= square matrix. Find: f(A)=function of this matrix A.

presque 6 ans il y a | 1 téléchargement |

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poly_gcd(p,q)
Find polynomial GCD by "Leading-coefficient Elinimation"

plus de 6 ans il y a | 1 téléchargement |

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The day of week
The day of week of any given day

plus de 8 ans il y a | 1 téléchargement |

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Matrix inverse and determinant
Finding inverse and determinant of matrix by order expansion and condensation

plus de 8 ans il y a | 4 téléchargements |

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mtx_d(A,D,d)
Making given matrix altered to have a certain constant for its determinant

environ 9 ans il y a | 1 téléchargement |

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Complex matrix inversion by Real matrix inversion
Calculate the complex matrix inverse by using only real matrix inverse

environ 9 ans il y a | 2 téléchargements |

A soumis


Making given matrix singular
Making the given matrix singular by adding a matrix with multiplier.

plus de 9 ans il y a | 1 téléchargement |

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inv_det_0(A)
Inverse and determinant of a matrix by order expansion and condensation

plus de 9 ans il y a | 1 téléchargement |

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Polynomials with multiple roots solved
Solving multiple roots polynomial, using simple elementary arithematic operations mostly.

presque 10 ans il y a | 1 téléchargement |

A soumis


Polynomial division - derived form covolution
Polynomial division is derived directly from convolution.

plus de 11 ans il y a | 1 téléchargement |

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Inverse and determinant of square matrix
Inverse and determinant of a square matrix are determined using only simple matrix multiplication

plus de 11 ans il y a | 1 téléchargement |

A soumis


Polynomial division by convolution -- up to finite terms
Division of two polynomials by convolution to get up to K terms.

presque 13 ans il y a | 1 téléchargement |

A soumis


Polynomial division by convolution - quotient and reminder
Division of two polynomials to get quotient and reminder using convolution matrix.

presque 13 ans il y a | 1 téléchargement |

A soumis


Solving multiple-root polynomials
Find roots and multiplicities of given polynomials using this short compact routine.

plus de 13 ans il y a | 1 téléchargement |

A soumis


Multiple-root polynomial solved by partial fraction expansion
To find poles/residues of the rational function, instead of roots/multiplicities of the polynomial

environ 15 ans il y a | 1 téléchargement |

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Polynomial coefficient vector derived from sub-polynomial factors
A polynomial coefficient vector is derived from several powered polynomial factors.

environ 15 ans il y a | 1 téléchargement |

A soumis


Factorization of a polynomial with multiple roots
By a novel effective approach "Monic polynomial subtraction" for computing GCD polynomial.

environ 15 ans il y a | 1 téléchargement |

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Exact GCD of integer polynomials
Exact GCD of a pair of polynomials is obtained by "elimination of leading polynomial coefficient"

plus de 15 ans il y a | 1 téléchargement |

A soumis


Factoring a multiple-root polynomial
A multiple-root polynomial is factored into lower-degree distict-root polynomials, then solved.

environ 16 ans il y a | 3 téléchargements |