Rafael Hernandez-Walls
My interest is everything related to numerical schemes applied to PDE and Oceanography, UABC.
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MATLAB Central Community 20 Year Anniversary Treasure Hunt participant badge
Awarded to Rafael Hernandez-Walls on 15 Sep 2021
15-year anniversary Scavenger Hunt finisher badge
Awarded to Rafael Hernandez-Walls on 09 Nov 2016
Contribute at least one answer each month for 6 consecutive months
Awarded to Rafael Hernandez-Walls on 02 Nov 2020
3 of your answers have been accepted
Awarded to Rafael Hernandez-Walls on 14 Jun 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
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
Solve all the problems in Draw Letters problem group
Awarded to Rafael Hernandez-Walls on 04 Aug 2018
Content Feed
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...
environ un mois ago
Solved
mathematics , probability problem
How many different result can we have, rolling k dice?
2 mois ago
Solved
MATLAB Basics: Complex Conjugates
For a given complex number, x, return the complex conjugate, y.
2 mois ago
Solved
MATLAB Basics: Complex Numbers
For a given complex number, x, return the real and imaginary parts as a vector, y = [Real Imaginary].
2 mois 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 mois 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 mois 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 mois ago
matlab not plotting graph
You need one point in the equation of z h = [2,4,6,8,10]; x = 10.1; y = 2.5; z = (x * h.^2 - x - sqrt(y^2*h.^2 - y^2))./ (h....
3 mois ago | 0
how i can find the chessboard lines and draw on the main image with any solution
Maybe you can use the Radon Transform, like this link: https://www.mathworks.com/help/images/detect-lines-using-the-radon-trans...
4 mois ago | 0
how can I get y which correspond to x and then plot (x,y)??
Try this: x=linspace(-4,4); for r=1:length(x) y(r)=fzero(@(y)y.^3+0.2*exp(-1*x(r).^2)*y.^2-2.2039*y.^2+0.8155,1); end p...
4 mois ago | 0
How to read data from text file and store as it is with variables
Assuming you have a file with only following line (name of file= 'algo.txt'): phi1_32_1 = 1 You could then read the line with...
4 mois ago | 0
numerical simulation of travelling wave of epidemic model
try this.... clear all; xl=0; xr=1; %domain[xl,xr] J=1000; % J: number of dividion for x dx=(x...
5 mois ago | 0
Read a txt file
try this Dens1 = [A(:,1),9.11*A(:,2).^(1.326)]; fileID1=fopen('E1.txt','w'); % [n,~]=size(Dens1); for k=1:n b=fprintf(...
6 mois ago | 0
How to display correlation coefficents on plot?
you can try something like this: x = [0 0.000009 0.000018 0.000028 0.000037 0.000046 0.000055 0.000065 0.000074 0.000083 0.0000...
6 mois ago | 0
extracting value from a matrix
I think it is better to put the variable X as a string and from there start. for example: X=['1000000000000000000000000000000...
6 mois ago | 0
| accepted
How to get Taylor polynomial for functions?
You can use a function that is in the MAThWORKS fileexchange (I put the link): str=input('Function? ','s'); %tray with: cos(x)...
6 mois ago | 0
| accepted
Change the sign of a Vector over N intervals
Use something like this: Y=rand(1,20); d=[1:4,8:12,17:20]; Y(d)=-Y(d)
7 mois ago | 0
For loop only outputting the final value.
Try using something like this: t=linspace(0,3*pi,100) t=linspace(0,3*pi,100); for k=1:length(t) y = q2(t(k)); val...
7 mois ago | 0
Plotting log x and y
Why don't you treat like this: n = 30; x = 0.5; h(1) = 1; emin = 1; for i =1:n if i==1 h(1)=0.5; else ...
8 mois ago | 0
Solved
Calculate the answer to life the universe and everything
<https://en.wikipedia.org/wiki/42_(number)>
10 mois ago
Solved
Simpsons's rule (but not Homer Simpson)
I wonder what Homer Simpson would have thought of Simpson's rule? Somehow I doubt his thoughts would have included the phrase Ne...
10 mois ago
