Rafael Hernandez-Walls

Last seen: Today

1,260 total contributions since 2010

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

Rafael Hernandez-Walls's Badges

Answered
plotting for cosine wave
I change some lines.... N=45; theta=0:360; % range of values of theta Na1=2*N*cosd(theta); % cosd for cos when you use de...

5 days ago | 0

Answered
Solving a simple integral with input equation from user
syms x str = input('Enter an equation in x: ','s') ; f = function_handle.empty; f = eval(['@(x)', str]); %x = f(); xmin= ...

6 days ago | 1

| accepted

Solved

Area of a pentagon
Given the side of a regular pentagon and its apothem return the area of pentagon. Remember the area of pentagon is calculate ...

10 days ago

Solved

Find the area of the square
There are *n²* circles inscribed in the square ABCD. The perimeter of each circle is *aπ* <<http://imgfz.com/i/3wzCeAT.png>> ...

11 days ago

Solved

Times 5
Try out this test problem first. Given the variable x as your input, multiply it by five and put the result in y. Examples...

11 days ago

Solved

Times 10
Try out this test problem first. Given the variable x as your input, multiply it by ten and put the result in y. Examples:...

11 days ago

Solved

Doubling elements in a vector (★★)
(copy of prob. 1024) Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] t...

11 days ago

Solved

Mo money, mo math #2! (★★★)
(adapted from Prob 9 Cody team) You have a matrix for which each row is a person and the columns represent the number of quar...

11 days ago

Solved

Sort even numbers from 1 to 100
Sort even numbers from 1 to 100 for ex: x=1:100

11 days ago

Solved

Sum of terms in a series 1 (★★★)
Given x and n, compute the following sum: |x|+|x|^(1/2)+|x|^(1/3)+|x|^(1/4)+|x|^(1/5) ... + |x|^(1/n) where ||x|| indica...

11 days ago

Solved

Power Numbers
Find the n-th power of m.

11 days ago

Solved

Sum 1 to 100 even number
Write a Matlab program to add all the even numbers from 0 to 100 |

11 days ago

Solved

How tall are you?
measures your height forexample= 175cm 180cm 169cm

11 days ago

Solved

Times 11
Try out this test problem first. Given the variable x as your input, multiply it by eleven and put the result in y. Exampl...

11 days ago

Solved

Mo money, mo math 1! (★★★)
(adapted from Prob 9 Cody team) You have a vector where the elements represent the number of $20 bills, $10 bills, $5 bills, ...

11 days ago

Solved

Times 3
Try out this test problem first. Given the variable x as your input, multiply it by three and put the result in y. Example...

11 days ago

Solved

Find the y=(1:x)
Look at the question

11 days ago

Answered
How do I calculate the coefficients C in this function while P and T are given?
You can use this equations: T=[4:4:24]'; P=[1e-4;2.5e-4;6e-4;1e-3;1.6e-3;2.25e-3]; plot(T,P,'o') n=length(P); A=[ones(n,1) ...

20 days ago | 0

| accepted

Answered
How can I find a variation vector of a parameter ?
N=100; a = 355.5+7; b = 355.5-7; r = (b-a).*rand(N,1) + a; figure plot(r) hold on plot([1 N],[a a],'r') plot([1 N],[b b]...

22 days ago | 0

Answered
Error in sum of matrixes
try this Nplies = 8; thetadt = [90; -45; 45; 0; 0; 45; -45; 90]; t = 0.125; %SI unit, milimeters h = Nplies*t; % Ply engine...

25 days ago | 0

Answered
How to rearrange multiple results of a function without using for loop?
Assuming that the initial value of k = 1, then it can be avoided using the repmat command as follows (see vector B), N = 11...

26 days ago | 0

| accepted

Solved

Given a square and a circle, please decide whether the square covers more area.
You know the side of a square and the diameter of a circle, please decide whether the square covers more area.

28 days ago

Solved

Pi Digit Probability
Assume that the next digit of pi constant is determined by the historical digit distribution. What is the probability of next di...

28 days ago

Solved

Convert hex color specification to MATLAB RGB
Here's something that comes up all the time if you deal with web pages. Given a <http://www.w3schools.com/html/html_colors.as...

1 month ago

Answered
How to calculate distance till the next possible stop?
I don't know is correct, parkinglocations = ["Home" "mobile" "ShoppingMall" "mobile" "Workplace" "mobile" "Home"]'; % when "mo...

1 month ago | 0

| accepted

Solved

Find out sum and carry of Binary adder
Find out sum and carry of a binary adder if previous carry is given with two bits (x and y) for addition. Examples Previo...

1 month ago

Solved

Bit Reversal
Given an unsigned integer _x_, convert it to binary with _n_ bits, reverse the order of the bits, and convert it back to an inte...

1 month ago

Answered
How to plot (n) circles with known center and radius
I don't know is you want this: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% theta=10 % azimuthal distance between the centers of circl...

1 month ago | 0

Solved

There are 10 types of people in the world
Those who know binary, and those who don't. The number 2015 is a palindrome in binary (11111011111 to be exact) Given a year...

1 month ago

Solved

Relative ratio of "1" in binary number
Input(n) is positive integer number Output(r) is (number of "1" in binary input) / (number of bits). Example: * n=0; r=...

1 month ago