Community Profile

# 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

Contributions in
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Submitted

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

Submitted

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

Submitted

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

Submitted

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

Submitted

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

Submitted

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

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

Submitted

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

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

Submitted

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

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

Submitted

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

Submitted

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

Submitted

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

Submitted

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

Submitted

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

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

Submitted

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

Submitted

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

Submitted

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