Jang geun Choi
Last seen: 5 meses ago
Pusan national university
887 total contributions since 2014I'm a student studying ocean science using matlab.
Jang geun Choi's Badges
Receive 10 likes on a problem you have created
Awarded to Jang geun Choi on 22 Oct 2020
Your submissions were downloaded 30 or more times in a month
Awarded to Jang geun Choi on 01 Nov 2019
Your submissions received 25 five star ratings
Awarded to Jang geun Choi on 09 Oct 2019
Publish your first submission
Awarded to Jang geun Choi on 09 Oct 2019
1 of your answers has been accepted
Awarded to Jang geun Choi on 20 Jul 2017
Provide your first answer ever to someone else's question
Awarded to Jang geun Choi on 20 Jul 2017
Obtain 50 solvers for a problem you have created
Awarded to Jang geun Choi on 16 Dec 2016
15-year anniversary Triathlon 2nd place badge
Awarded to Jang geun Choi on 09 Nov 2016
15-year anniversary Scavenger Hunt finisher badge
Awarded to Jang geun Choi on 09 Nov 2016
Receive 25 likes on a problem you have created
Awarded to Jang geun Choi on 11 Oct 2016
Create 10 problems
Awarded to Jang geun Choi on 07 Oct 2016
Create a problem
Awarded to Jang geun Choi on 07 Oct 2016
Solve 500 problems
Awarded to Jang geun Choi on 06 Oct 2016
Solve all the problems in CUP Challenge
Awarded to Jang geun Choi on 03 Oct 2016
Solve a problem for the first time
Awarded to Jang geun Choi on 28 Dec 2014
Submitted
Physical oceanography: wave and energy conservation
Calculate wave and its energy
más de 4 años ago | 3 downloads |
Submitted
Physical oceanography: wave equation (two-dimensional)
Simulate two-dimensional wave
más de 4 años ago | 4 downloads |
Solved
Freebies anyone? No!!!!
Feel free to copy paste all the tests and voila you solved the problem
más de 4 años ago
Problem
Calculate solution of given polynomial
For example, y=function([3 -2 -4]) In here, input vector indicate 3*x^2-2*x-4, y is solution of former equation. y=[1.5...
más de 4 años ago | 2 | 58 solvers
Problem
Print true if
all elements are larger than 5 a=[1 3 5 8 6]; b=[6 6 6 6 6]; function(a) should be false, and function(b) will be tru...
más de 4 años ago | 2 | 111 solvers
Problem
Solve the system of linear equations
4x - 2y +6z=8 2x + 8y +2z=4 6x + 10y +3z=0 Find x,y,z. Output should be a=[x;y;z].
más de 4 años ago | 5 | 55 solvers
Problem
Save variables
a=[1] Save variable a that is located in workspace into current folder. File name should be 'a.mat'
más de 4 años ago | 4 | 66 solvers
Problem
Change matrix to vector2
From x = 4 3 5 1 5 1 To y = 4 3 5 1 ...
más de 4 años ago | 6 | 91 solvers
Problem
Change matrix to vector
Vector is a matrix whose size is 1 x n or n x 1. Change matrix to vector. x = 4 3 5 1 ...
más de 4 años ago | 7 | 139 solvers
Problem
How to calculate log?
There is a log that have base 5. How to calculate? log5(x)?
más de 4 años ago | 8 | 122 solvers
Problem
Calculate some equation
Using given inputs x and z, make two outputs that are y1=(xz)/(x/z)^2+14x^2-0.8z^2 y2=x^z-z^x+(x/z)^2-(z/x)^2
más de 4 años ago | 7 | 130 solvers
Submitted
Physical oceanography: wave equation (open boundary)
Simulate wave in the open boundary
más de 4 años ago | 2 downloads |
Problem
Calculate inverse matrix in m by n matrix
x=(1:10)' y=roundn(2*x+7*rand(size(x)),-1) a*x=y Estimate a using inverse matrix calculation. This is principle of li...
más de 4 años ago | 5 | 74 solvers
Problem
Calculate area of sector
A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area.
más de 4 años ago | 12 | 725 solvers
Solved
Additive persistence
Inspired by Problem 2008 created by Ziko. In mathematics, the persistence of a number is the *number of times* one must apply...
más de 4 años ago
Solved
Polynomial division
Divide a polynomial u by polynomial v and return the quotients only. Example: u = x^4+3*x^3+5*x+3 v = x^2+1 Answer: ...
más de 4 años ago
Solved
Accessing elements on the diagonal
Access the diagonal elements of a matrix without 'diag' function
más de 4 años ago
Solved
Remove NaNs and numbers adjacent to NaNs
The aim is to remove the elements before and after NaN occurrences inside a vector. For example: x = [6 10 5 8 9 NaN 23 1...
más de 4 años ago
Solved
Calculate the nth Fibonacci number USING 'Golden Ratio' concept
f = [1 1 2 3 5 8 13 ...] If n=6, f(6)=8
más de 4 años ago
Solved
Solving a quadratic equation
Given a, b and c, Return the solution of the following quadratic equation: a*x^2 + b*x + c = 0.
más de 4 años ago
Solved
Weave two vectors into one
Weave the two given vectors into one as shown below. Example: If a = [1 1 1] b = [0 0 0] then y = [1 0 1 0 ...
más de 4 años ago
Solved
Calculate the integral of the polynomial
for e.g. in = [3 2 1] out = [1 1 1 0]
más de 4 años ago
Solved
Find out magnitude of vector
Find out magnitude of vector. Say x=[1 2 3], then answer must sqrt(1^2+2^2+3^2) Please don't use sum function. If you l...
más de 4 años ago
Solved
Evaluate Polynomial
Given a polynomial equation coefficients in a vector p, you have to return its value at x. Example: For inputs p and x ...
más de 4 años ago
Solved
Convert a Cell Array into an Array
Given a square cell array: x = {'01', '56'; '234', '789'}; return a single character array: y = '0123456789'
más de 4 años ago
Solved
Sum the real and imaginary parts of a complex number
Sum the real and imaginary parts of a complex number. Example c = 1+2i has the solution 1 + 2 = 3
más de 4 años ago
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