Jang geun Choi
Pusan national university
I'm a student studying ocean science using matlab.
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15-year anniversary Triathlon 2nd place badge
Awarded to Jang geun Choi on 09 Nov 2016
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Awarded to Jang geun Choi on 09 Nov 2016
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Awarded to Jang geun Choi on 20 Jul 2017
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Awarded to Jang geun Choi on 16 Dec 2016
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Awarded to Jang geun Choi on 01 Nov 2019
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Awarded to Jang geun Choi on 09 Oct 2019
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Create 10 problems
Awarded to Jang geun Choi on 07 Oct 2016
Create a problem
Awarded to Jang geun Choi on 07 Oct 2016
Content Feed
Submitted
Physical oceanography: wave and energy conservation
Calculate wave and its energy
casi 5 años ago | 1 download |
Submitted
Physical oceanography: wave equation (two-dimensional)
Simulate two-dimensional wave
casi 5 años ago | 1 download |
Solved
Freebies anyone? No!!!!
Feel free to copy paste all the tests and voila you solved the problem
casi 5 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...
casi 5 años ago | 2 | 61 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...
casi 5 años ago | 3 | 116 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].
casi 5 años ago | 5 | 58 solvers
Problem
Save variables
a=[1] Save variable a that is located in workspace into current folder. File name should be 'a.mat'
casi 5 años ago | 4 | 69 solvers
Problem
Change matrix to vector2
From x = 4 3 5 1 5 1 To y = 4 3 5 1 ...
casi 5 años ago | 6 | 97 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 ...
casi 5 años ago | 7 | 147 solvers
Problem
How to calculate log?
There is a log that have base 5. How to calculate? log5(x)?
casi 5 años ago | 9 | 128 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
casi 5 años ago | 7 | 134 solvers
Submitted
Physical oceanography: wave equation (open boundary)
Simulate wave in the open boundary
casi 5 años ago | 1 download |
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...
casi 5 años ago | 5 | 78 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.
casi 5 años ago | 13 | 876 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...
casi 5 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: ...
casi 5 años ago
Solved
Accessing elements on the diagonal
Access the diagonal elements of a matrix without 'diag' function
casi 5 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...
casi 5 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
casi 5 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.
casi 5 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 ...
casi 5 años ago
Solved
Calculate the integral of the polynomial
for e.g. in = [3 2 1] out = [1 1 1 0]
casi 5 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...
casi 5 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 ...
casi 5 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'
casi 5 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
casi 5 años ago
