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Feng Cheng Chang


Allwave Corporation

26 total contributions since 2008

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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Feng Cheng Chang's Badges

Contributions in
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Submitted


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

11 months ago | 0 downloads |

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Submitted


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

12 months ago | 5 downloads |

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Submitted


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

2 years ago | 0 downloads |

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

2 years ago | 2 downloads |

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Submitted


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

2 years ago | 1 downloads |

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

2 years ago | 0 downloads |

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Question


Find s, such that det(A+s*D) = d.
Given a non-sigular matrix A, an arbitrary matrix D, and a real or complex number d, I want to see any short-cut to find the num...

2 years ago | 2 Answers | 0

2

answers

Submitted


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

2 years ago | 2 downloads |

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Answered
Making a magic square matrix singular
Dear Readers: I have already accepted the expected simple answer from Ahmed A Selman, so I would like to conclude this "Quest...

3 years ago | 1

Question


Making a magic square matrix singular
We know that any magic square matrix of odd order is not singular. When each element of the matrix is subtracted by the sum-ave...

3 years ago | 4 Answers | 0

4

answers

Submitted


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

4 years ago | 0 downloads |

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Question


Output of a vector which excludes the entries of the second vector
Hello, Problem: Given two distinct integer vectors p and q. I'd like to get a new vector r, that is p excluding the entries o...

4 years ago | 2 Answers | 0

2

answers

Submitted


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

4 years ago | 7 downloads |

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Submitted


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

5 years ago | 2 downloads |

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Submitted


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

5 years ago | 1 downloads |

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Submitted


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

6 years ago | 1 downloads |

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Submitted


GCD of Polynomials
Find polynomial GCD by "Leading-coefficient Elinimation"

7 years ago | 5 downloads |

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Responded


Re: Formating equation for the use of 'roots'
You may try to use my m-file, "polyget.m" (File ID 23900 updated 25 Apr 2009 in File Exchange) to create a polynomial coefficien...

7 years ago | 1791 views

Responded


Re: Formating equation for the use of 'roots'

7 years ago | 1791 views

Submitted


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

7 years ago | 1 downloads |

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Submitted


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

7 years ago | 0 downloads |

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Submitted


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

7 years ago | 0 downloads |

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

8 years ago | 2 downloads |

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Submitted


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

8 years ago | 2 downloads |

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