Rafael Hernandez-Walls
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My interest is everything related to numerical schemes applied to PDE and Oceanography, UABC.
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MATLAB Central Community 20 Year Anniversary Mini Hack participant badge
Awarded to Rafael Hernandez-Walls on 11 Nov 2021
MATLAB Central Community 20 Year Anniversary Treasure Hunt participant badge
Awarded to Rafael Hernandez-Walls on 15 Sep 2021
10 of your answers have been accepted
Awarded to Rafael Hernandez-Walls on 15 Feb 2022
Contribute at least one answer each month for 6 consecutive months
Awarded to Rafael Hernandez-Walls on 02 Nov 2020
Obtain 50 solvers for a problem you have created
Awarded to Rafael Hernandez-Walls on 29 Jan 2021
Solve a community group
Awarded to Rafael Hernandez-Walls on 25 Dec 2019
Your submissions were downloaded 10 or more times in a month
Awarded to Rafael Hernandez-Walls on 01 Nov 2019
Publish your first submission
Awarded to Rafael Hernandez-Walls on 09 Oct 2019
3 of your answers have been accepted
Awarded to Rafael Hernandez-Walls on 14 Jun 2020
Solve all the problems in Introduction to MATLAB problem group
Awarded to Rafael Hernandez-Walls on 24 Nov 2019
Solve Project Euler problems using Matlab
Awarded to Rafael Hernandez-Walls on 24 Oct 2018
Solve all the problems in Cody Problems in Japanese problem group
Awarded to Rafael Hernandez-Walls on 20 Aug 2018
Feeds
Solved
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 months ago
Solved
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 months ago
Solved
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 months ago
Solved
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 months ago
Solved
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 ...
2 years ago
Solved
Calculate Wind Chill Factor
The NWS Wind Chill Temperature (WCT) index formula for calculating the dangers from winter winds and freezing temperatures: Cal...
2 years ago
Solved
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...
2 years ago
Solved
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...
2 years ago
Solved
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...
2 years ago
Solved
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?
2 years ago
Solved
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; ...
2 years ago
Solved
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...
2 years ago
Solved
Differential equations I
Given a function handle |f| an initial condition |y0| and a final time |tf|, solve numerically the differential equation dy...
2 years ago
Solved
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 ...
2 years ago
Solved
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...
3 years ago
Solved
mathematics , probability problem
How many different result can we have, rolling k dice?
3 years ago
Solved
MATLAB Basics: Complex Conjugates
For a given complex number, x, return the complex conjugate, y.
3 years ago
Solved
MATLAB Basics: Complex Numbers
For a given complex number, x, return the real and imaginary parts as a vector, y = [Real Imaginary].
3 years ago
Solved
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: ...
3 years ago
Solved
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...
3 years ago
Solved
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...
3 years ago
Solved
Calculate the answer to life the universe and everything
<https://en.wikipedia.org/wiki/42_(number)>
4 years ago
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