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Junho Kweon


Last seen: 13 dagar ago |  Active since 2018

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Doctoral student in Electrical Engineering at Penn State

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Answered
chol() gives error for a (barely) positive definite matrix.
There is quite well-developed code nearestSPD, which can solve the minor round-off error as @Christine Tobler mentioned. The cod...

ungefär ett år ago | 0

Question


How can I derive inverse of the matrix with infinite determinant?
Hi guys, there is a matrix A which has finite dimension and finite-valued elements. However, because of its large size and valu...

mer än ett år ago | 4 answers | 0

4

answers

Solved


Determine if Input is Oddish or Evenish (Odd/Even Sum of Digits)
Given a positive integer n, determine whether n is "oddish" or "evenish" - that is, whether the sum of the digits of n is odd or...

mer än ett år ago

Solved


Determine if x is a combination of m and n
Given positive integers x, m, and n, determine if x can be written as x = am + bn for any (non-negative) integers a and b. Your ...

mer än ett år ago

Solved


Create an arrow matrix
An arrow matrix is a square matrix that contains ones on the diagonal, the last column, and last row. ...

mer än ett år ago

Solved


Calculating Student Grades
The matrix grades contains raw grades for 7 students who took your course. Each row represents a different student. The first 7 ...

mer än ett år ago

Solved


Dog Statistics
The vectors ht and wt contains the heights and weights of 20 golden retrievers. In some cases, it was not possible to make both ...

mer än ett år ago

Solved


Generate this matrix
Generate the following matrix. n = 2; out = [-4 -3 -2 -1 0 -3 -2 -1 0 1 -...

mer än ett år ago

Solved


Simpson's Paradox - Calculate correlation coefficients for groups of data
Simpson's Paradox is a statistical phenomenon where groups of data can have a characteristic while the whole data set together h...

mer än ett år ago

Solved


Find the minimum of the column-maximums of a matrix
Given a matrix A, find the maximum value of each column, then return the smallest of those maximum values (ie return the minimum...

mer än ett år ago

Solved


Calculate the mean of each half of a matrix
Given a matrix with an even number of columns, n, return a 1-by-2 row vector where the first element is the mean of all the elem...

mer än ett år ago

Solved


Find Closest Constant
Given a number x, return the value that is closest to x from this list of constants: 0, 1, , e, , (also known as ). For exampl...

mer än ett år ago

Solved


Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the numbers. Otherwise return false. Example...

mer än ett år ago

Solved


Return area of square
Side of square=input=a Area=output=b

mer än ett år ago

Solved


Maximum value in a matrix
Find the maximum value in the given matrix. For example, if A = [1 2 3; 4 7 8; 0 9 1]; then the answer is 9.

mer än ett år ago

Solved


Add two numbers
Given a and b, return the sum a+b in c.

mer än ett år ago

Solved


Doubling elements in a vector
Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...

mer än ett år ago

Solved


Create a vector
Create a vector from 0 to n by intervals of 2.

mer än ett år ago

Solved


Flip the vector from right to left
Flip the vector from right to left. Examples x=[1:5], then y=[5 4 3 2 1] x=[1 4 6], then y=[6 4 1]; Request not ...

mer än ett år ago

Solved


Whether the input is vector?
Given the input x, return 1 if x is vector or else 0.

mer än ett år ago

Solved


Find max
Find the maximum value of a given vector or matrix.

mer än ett år ago

Solved


Inner product of two vectors
Find the inner product of two vectors.

mer än ett år ago

Solved


Arrange Vector in descending order
If x=[0,3,4,2,1] then y=[4,3,2,1,0]

mer än ett år ago

Solved


Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

mer än ett år ago

Solved


Vector creation
Create a vector using square brackets going from 1 to the given value x in steps on 1. Hint: use increment.

mer än ett år ago

Solved


Get the length of a given vector
Given a vector x, the output y should equal the length of x.

mer än ett år ago

Solved


Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

mer än ett år ago

Solved


Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

nästan 2 år ago

Question


How can I convert a function with multivariable input to a function with single vector input?
Hi, I want to use fmincon, and fmincon can deal with only function with single vector input. When my formula is as below, it wo...

ungefär 2 år ago | 1 answer | 0

1

answer

Question


How to take a part of matrix, which is function result?
My code is like this. A = [1 2; 3 4]; B = sum(A) % I want to use fft or other functions rather than 'sum' x = B(1) ...

mer än 5 år ago | 1 answer | 0

1

answer