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Rafael Hernandez-Walls


Last seen: 23 jours il y a |  Actif depuis 2010

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My interest is everything related to numerical schemes applied to PDE and Oceanography, UABC.

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  • Knowledgeable Level 2
  • Introduction to MATLAB Master
  • Project Euler I
  • Cody Problems in Japanese Master

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A résolu


Swap between first and last column
The idea is to swap between first and last column Ex = [1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5; 1 2 3 ...

7 mois il y a

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Remove a specific row with max value
Remove the row that contain the max value in the matrix? If you like the problem, please like it :)

7 mois il y a

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Swap between rows
The idea is to swap between second and second last row Ex = [1 2 3 4 5; 5 4 3 2 1; 1 2 3 4 5; 1 2 3 4 5; ...

7 mois il y a

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Count consecutive 0's in between values of 1
So you have some vector that contains 1's and 0's, and the goal is to return a vector that gives the number of 0's between each ...

10 mois il y a

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Molar Air Density from Temperature and Pressure
The molar density of air can be found from the Temperature and Pressure using the ideal gas law. where the Molar density STP ...

environ 2 ans il y a

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Calculate Wind Chill Factor
The NWS Wind Chill Temperature (WCT) index formula for calculating the dangers from winter winds and freezing temperatures: Cal...

environ 2 ans il y a

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Air Mass to Star for an Observer at Mean Sea Level
Air mass is a measure of how much atmosphere light from a source above the atmosphere (eg sun, planet, star) has to travel throu...

environ 2 ans il y a

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Find Air Temperature from Cricket Stridulation Rate
Stridulation is the process that creates a cricket's “chirp” by rubbing their wings or legs. According to the Old Farmer's Alma...

environ 2 ans il y a

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Construyendo matrices parte 2
Construye la siguiente matriz a partir de otros tres vectores/matrices. [ 1 8 15 3 3 3 3 2 9 16 3 3...

environ 2 ans il y a

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Sum of series IV
What is the sum of the following sequence: Σ(-1)^(k+1) (2k-1)^2 for k=1...n for different n?

environ 2 ans il y a

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Back to basics 22 - Rotate a matrix
Covering some basic topics I haven't seen elsewhere on Cody. Rotate the input matrix 90 degrees counterclockwise (e.g. [1 2; ...

environ 2 ans il y a

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Composite Trapezoidal Rule for Numeric Integration
Use the trapezoidal rule to numerically integrate a function, _f(x)_, passed as the first argument, between upper and lower limi...

environ 2 ans il y a

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Differential equations I
Given a function handle |f| an initial condition |y0| and a final time |tf|, solve numerically the differential equation dy...

environ 2 ans il y a

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Weighted Convolution
Given two input vectors x = [x_1, x_2, ..., x_K] and y = [y_1, y_2, ..., y_K] of equal length, compute the weighted convolution ...

plus de 2 ans il y a

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The Piggy Bank Problem
Given a cylindrical piggy bank with radius g and height y, return the bank's volume. [ g is first input argument.] Bonus though...

environ 3 ans il y a

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mathematics , probability problem
How many different result can we have, rolling k dice?

plus de 3 ans il y a

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MATLAB Basics: Complex Conjugates
For a given complex number, x, return the complex conjugate, y.

plus de 3 ans il y a

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MATLAB Basics: Complex Numbers
For a given complex number, x, return the real and imaginary parts as a vector, y = [Real Imaginary].

plus de 3 ans il y a

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Flip coins

plus de 3 ans il y a

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Normalizing a vector

plus de 3 ans il y a

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Return fibonacci sequence do not use loop and condition
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: ...

plus de 3 ans il y a

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Number of Even Elements in Fibonacci Sequence
Find how many even Fibonacci numbers are available in the first d numbers. Consider the following first 14 numbers 1 1 2...

plus de 3 ans il y a

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Find the next Fibonacci number
In the sequence of Fibonacci numbers, every number is the sum of the two preceding ones: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55...

plus de 3 ans il y a

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Mass Conversion 1

plus de 3 ans il y a

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Mass Conversion 2

presque 4 ans il y a

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Calculate the answer to life the universe and everything
<https://en.wikipedia.org/wiki/42_(number)>

presque 4 ans il y a

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How many hours are there in a day in Italy?
Remember "European Summer Time"

presque 4 ans il y a

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Temperature Conversion 3

presque 4 ans il y a

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Temperature Conversion 2

presque 4 ans il y a

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Temperature Conversion 1

presque 4 ans il y a

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