# Junho Kweon

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Doctoral student in Electrical Engineering at Penn State

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**Feeds**

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...

meer dan een jaar 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...

bijna 2 jaar ago | 4 answers | 0

### 4

answersSolved

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...

ongeveer 2 jaar 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 ...

ongeveer 2 jaar 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. ...

ongeveer 2 jaar 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 ...

ongeveer 2 jaar 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 ...

ongeveer 2 jaar ago

Solved

Generate this matrix

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

ongeveer 2 jaar 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...

ongeveer 2 jaar 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...

ongeveer 2 jaar 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...

ongeveer 2 jaar 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...

ongeveer 2 jaar 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...

ongeveer 2 jaar 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.

ongeveer 2 jaar 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 ...

ongeveer 2 jaar 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 ...

ongeveer 2 jaar ago

Solved

Whether the input is vector?

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

ongeveer 2 jaar 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...

ongeveer 2 jaar 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.

ongeveer 2 jaar ago

Solved

Get the length of a given vector

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

ongeveer 2 jaar 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 ...

ongeveer 2 jaar 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...

meer dan 2 jaar 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...

meer dan 2 jaar ago | 1 answer | 0

### 1

answerQuestion

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) ...

ongeveer 6 jaar ago | 1 answer | 0