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Six Steps to PCA - Step 1: Centre and Standardize
*Introduction* Principal Component Analysis (PCA) is a classic among the many methods of multivariate data analysis. Invented...

3 years ago

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cos for boss?
a programmer had too much coffee and his boss needs cos(alpha+beta) correctly, especially when alpha or beta are close to pi/2 a...

3 years ago

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GJam: 2013 China Event: Cannon Angle
This Challenge is derived from <http://code.google.com/codejam/contest/2933486/dashboard#s=p1 GJam 2013 China Captain Hammer>. T...

3 years ago

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GJam 2013 Veterans: Hedge
This Challenge is derived from <http://code.google.com/codejam/contest/2334486/dashboard Hedgemony>. This is the Large data set ...

3 years ago

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Loading/Expanding a ZIP file from File Exchange
This challenge is to load a ZIP file from Mathworks File Exchange and UNZIP the contents. *Input:* url_link of ZIP'd file ...

3 years ago

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Free Fall analytical solution (Chapra 2012 textbook Example 1.1)
Analytical solution to bungee jumper problem. Given time series as a vector, parameters mass and drag coefficient, and gravit...

3 years ago

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Determine if input is greater than pi
Evaluate if given number is greater than pi. If greater, return true; else, return false.

3 years ago

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Radiation Heat Transfer — View Factors (3)
View factors (aka configuration factors) are utilized in some radiation heat transfer models to estimate heat transfer rates bet...

3 years ago

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Distance between two GPS Coordinates
A problem that arises when performing geographically weighted regression is determining the distance between GPS coordinates. GI...

3 years ago

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List the emirps
An emirp is a prime number that becomes a different prime when reversed. The numbers 13, 17, and 149 are emirps, but 11, 19, and...

3 years ago

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Cryptomath: Addition
W A I T + A L L --------- G I F T S equals: 9 6 0 8 + 6 7 7 --------- 1 0 2 8 5 Given str...

3 years ago

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String substitution, sub problem to cryptoMath
This is a sub problem related to this problem: <http://www.mathworks.com/matlabcentral/cody/problems/621-cryptomath-addition>...

3 years ago

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Guess the number I'm thinking of (Part 1)
In this game you are competing against two other people to guess the number that I'm thinking of. I randomly choose an integer ...

3 years ago

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Break it up! Break it up!
You have N pennies. Write a Matlab script that will reveal how many different ways you can break up those pennies. For example...

3 years ago

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Balanced Ternary Numbers: Easy as |, |-, |o
This problem concerns the so-called <http://en.wikipedia.org/wiki/Balanced_ternary balanced ternary> system for representing num...

3 years ago

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Pairwise Euclidean Distance
Given two matrices A,B of dimensions NxK and NxL respectively, calculate the pairwise euclidean distance of all vectors (columns...

3 years ago

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Generating random matrix with given probability mass function
Inspired by <http://www.mathworks.com/matlabcentral/cody/problems/2356-simulating-the-selection-of-a-state-with-given-probabilit...

3 years ago

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Determine whether a prime is Pythagorean

3 years ago

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Count trailing zeros in a primorial
<https://www.mathworks.com/matlabcentral/cody/problems/44068-the-number-of-trailing-zero-digit-of-a-factorial Cody Problem 44068...

3 years ago

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The number of trailing zero digit of a factorial
For given positive integer n, take factorial of that number. How many trailing zeros does it have? Example: factorial(11) = 3...

3 years ago

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Determine given vector is even or odd
Find the numbers of the input vector is odd or even then replace even with 1 and odd with 0 Example x = [ 3 3 4 6 1] ...

3 years ago

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Area-02
Given the radius of the circle inscribed in a square, find the area of the square that can be fitted perfectly in the corner. ...

3 years ago

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Matrix Rotation
You are given a 2D matrix of dimension [m,n] and a positive integer r. You have to rotate the matrix r times and print the resul...

3 years ago

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Powers Of
Fill the vector with powers of 2, so that vector(1) is 2^1, vector(2) is 2^2, etc. Stop with vector(10). Complete the function ...

3 years ago

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Analyze observation data
Suppose you have the following data (A,B,C) in three-column format. A B C -------------------------- t=1 ...

3 years ago

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Solve the system of linear equations
4x - 2y +6z=8 2x + 8y +2z=4 6x + 10y +3z=0 Input is each coefficient of polynomial. For example, a=[4 ...

3 years ago

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Interpolate scattered data.
Most data was scattered, and there is no gird. There are three data [c] in three different area [x,y]. x=[1 3 4]; y=[1 ...

3 years ago

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Determine point is located in a circle or not
Using input [x] and [y], determine the points (x,y) is located inside of circle (x^2+y^2=1) if point is located in circle, outp...

3 years ago

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Calculate correlation.
There are two data. y1=[0 1 2 3 4]' y2=[2 3 4 5 6]' We can see positive relationship between y1 and y2. The relations...

3 years ago

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Would you win a raffle?

3 years ago