
Feng Cheng Chang
Allwave Corporation
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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Submitted
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...
4 years ago | 1 download |
Submitted
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.
4 years ago | 1 download |
Submitted
poly_gcd(p,q)
Find polynomial GCD by "Leading-coefficient Elinimation"
5 years ago | 2 downloads |
Submitted
Matrix inverse and determinant
Finding inverse and determinant of matrix by order expansion and condensation
7 years ago | 6 downloads |
Submitted
mtx_d(A,D,d)
Making given matrix altered to have a certain constant for its determinant
8 years ago | 1 download |
Submitted
Complex matrix inversion by Real matrix inversion
Calculate the complex matrix inverse by using only real matrix inverse
8 years ago | 2 downloads |
Submitted
Making given matrix singular
Making the given matrix singular by adding a matrix with multiplier.
8 years ago | 1 download |
Submitted
inv_det_0(A)
Inverse and determinant of a matrix by order expansion and condensation
8 years ago | 1 download |
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...
8 years ago | 2 answers | 0
2
answersSubmitted
Polynomials with multiple roots solved
Solving multiple roots polynomial, using simple elementary arithematic operations mostly.
9 years ago | 2 downloads |
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...
10 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...
10 years ago | 4 answers | 0
4
answersSubmitted
Polynomial division - derived form covolution
Polynomial division is derived directly from convolution.
10 years ago | 2 downloads |
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...
10 years ago | 2 answers | 0
2
answersSubmitted
Inverse and determinant of square matrix
Inverse and determinant of a square matrix are determined using only simple matrix multiplication
10 years ago | 4 downloads |
Submitted
Polynomial division by convolution -- up to finite terms
Division of two polynomials by convolution to get up to K terms.
11 years ago | 1 download |
Submitted
Polynomial division by convolution - quotient and reminder
Division of two polynomials to get quotient and reminder using convolution matrix.
11 years ago | 1 download |
Submitted
Solving multiple-root polynomials
Find roots and multiplicities of given polynomials using this short compact routine.
12 years ago | 1 download |
Submitted
Multiple-root polynomial solved by partial fraction expansion
To find poles/residues of the rational function, instead of roots/multiplicities of the polynomial
14 years ago | 1 download |
Submitted
Polynomial coefficient vector derived from sub-polynomial factors
A polynomial coefficient vector is derived from several powered polynomial factors.
14 years ago | 1 download |
Submitted
Factorization of a polynomial with multiple roots
By a novel effective approach "Monic polynomial subtraction" for computing GCD polynomial.
14 years ago | 2 downloads |
Submitted
Exact GCD of integer polynomials
Exact GCD of a pair of polynomials is obtained by "elimination of leading polynomial coefficient"
14 years ago | 1 download |
Submitted
Factoring a multiple-root polynomial
A multiple-root polynomial is factored into lower-degree distict-root polynomials, then solved.
15 years ago | 2 downloads |