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ChrisR


Last seen: Today
2,958 total contributions since 2015

I teach courses in water resources and environmental fluid mechanics.

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  • Divisible by x Master
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  • Magic Numbers II Master
  • Sequences And Series I Master
  • ASEE Challenge Master
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Tridiagonal matrix
Given vectors u and v, make a tri-diagonal symmetric matrix such that u is in the main diagonal and v is below and above diagona...

2 hours ago

Solved


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...

2 hours ago

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Remove all the columns contains only zero
Remove the column from the matrix which has only zeros . Refer the Example below a= 1 0 3 0 23 0 56 0 1 ...

2 hours ago

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Slope of the line passing through two points
Determine the slope of a line passing through the points a=[x1 y1] and b=[x2 y2].

2 hours ago

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Factorial: Unlimited Size : java.math
This challenge is an application of java.math that allows unlimited precision calculations. The primary reference sites are <ht...

11 hours ago

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Repeat string n times - 2
This is the two variable version of <http://www.mathworks.com/matlabcentral/cody/problems/42482-repeat-string-n-times Repeat str...

2 days ago

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Delete the rows in the middle
We will delete the rows in the middle and keep the first and the last rows. For example if input is [1 2 1 7 1 8 ...

2 days ago

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How Far Can You Throw Something?
As you probably learned in your high school physics class, throwing an object at a 45 degree angle will give you the maximum ran...

2 days ago

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Divisible by n, Composite Divisors
Pursuant to <http://www.mathworks.com/matlabcentral/cody/problems/42453-divisible-by-n-prime-vs-composite-divisors Divisible by ...

2 days ago

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Divisible by n, Truncated-number Divisors
Some divisors only require a few numbers at the end of the number in question to determine divisibility, no matter how long. Exa...

3 days ago

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Divisible by n, prime divisors from 20 to 200
Pursuant to the previous problem (linked below), this problem requires a function that checks for divisibility of large numbers ...

3 days ago

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D'Hondt Method of Proportional-Representation
The D'Hondt method is a proportional representational method for allocating seats to parties in an election. <https://en.wiki...

3 days ago

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Square
square root of x

3 days ago

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factorial
calculate x!

3 days ago

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Pass the Threshold!!
Write a Matlab function that will take as input a matrix of arbitrary dimensions and a scalar threshold value, and return a vec...

3 days ago

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Find the Pattern
Find the pattern between input and output. Write a function that gives the correct output for any input. *Hint: magic*

3 days ago

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Number Puzzle - 117

3 days ago

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Number Puzzle - 115

3 days ago

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Number Puzzle - 116

3 days ago

Solved


Number Puzzle - 112

3 days ago

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Number Puzzle - 111

3 days ago

Solved


Number Puzzle - 113

3 days ago

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Number Puzzle - 114

3 days ago

Solved


Number Puzzle - 110

4 days ago

Solved


Number Puzzle - 109

4 days ago

Solved


Prime Time
All you need to do here is submit your solution a prime number of seconds after the top of the hour. Any hour at all... Easy, ...

4 days ago

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Must be in the front row...
You are given a matrix followed by a single number. Your object is to write a script that will shift the matrix around so that ...

4 days ago

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Go to the head of the class!
You're given a matrix and a single number. If that number is in the matrix, reorder the matrix so that number is in the first r...

4 days ago

Solved


Fun with a compass
Each night for the past week, you have been having the same nightmare: You find yourself back in your junior high school geometr...

4 days ago

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