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Rafael Hernandez-Walls


Last seen: 3 days ago
1,310 total contributions since 2010

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

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Answered
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 ...

13 days ago | 0

Solved


Mass Conversion 2

2 months ago

Solved


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

2 months ago

Solved


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

2 months ago

Solved


Temperature Conversion 3

2 months ago

Solved


Temperature Conversion 2

2 months ago

Solved


Temperature Conversion 1

2 months 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...

2 months ago

Solved


Total energy

2 months ago

Solved


Potential energy calculation

2 months ago

Solved


Kinetic energy calculation

2 months ago

Solved


Laws of motion 7

2 months ago

Solved


Laws of motion 6

2 months ago

Solved


Laws of motion 5

2 months ago

Solved


Laws of motion 4

2 months ago

Solved


Laws of motion 3

2 months ago

Solved


Laws of motion 2

2 months ago

Solved


Laws of motion 1

2 months ago

Answered
How can i draw the graph of this two functions using matlab
when i have this like problem i use this code: t=linspace(0,2*pi,50); f=((t>0)&(t<=1)).*2+((t>1)&(t<=pi/2)).*0.5.*t.^2+((t>pi...

2 months ago | 0

Answered
Finding the length of square function
t2=t(find(diff(X)>0)); t1=t(find(diff(X)<0)); long_time=t2(2)-t1(2)

3 months ago | 0

Answered
How to create a sine wave with variable frequency - Simulink
something like this: (?) t=linspace(0,2*pi,100); f=rand(1,100); y=sin(f.*t); plot(t,y)

3 months ago | 0

Answered
Euler method returning error
maybe you need copy the function eulsys.m in your system. In this link you have a copy: http://macs.citadel.edu/chenm/344.dir/0...

3 months ago | 0

Answered
how do i plot only certain part of cepstrum
KSSV ks suggests that you work with the index, here I show you an example of what KSSV mentions, x=linspace(0,10,100); y=x.^2;...

3 months ago | 0

| accepted

Answered
How do I resolve this stability criterion question?

4 months ago | 0

Answered
creating multiple values of the same x,y,z
x=[ 2, 4, 2]; repmat(x,10,1)

4 months ago | 0

| accepted

Answered
no data plots on graph (plot (x,y))
David is correct. Why don't you try something like that in your code... d(1) = 32000; H = 8000; Re = 6370000; %c2 = 0.5*exp(...

4 months ago | 0

| accepted

Answered
Invalid syntax error with a simple code
tray this x = [-2 -1.5 -1 -0.5 0 0.5 1 1.5 2]; y = (x+x.*(sqrt(x+3))).*(1+2*(x.^(2)));

4 months ago | 0

| accepted

Answered
How can I obtain slope of a trend line calculated for a time serie
Maybe this is useful for you https://www.mathworks.com/help/matlab/ref/detrend.html

4 months ago | 0

Solved


Find the repeating elements and repetitions of a row vector.
So let's say that x is a vector, for example, x = [4, 4, 5, 5, 5, 6, 7, 7，8, 8, 8, 8] Now we want to get the following two ve...

4 months ago

Answered
Why does my plot not appear?
Vmax = 354*10^(-6); Km = 1.5*10^(-3); S = .0000005:.0000005:.000030; v = Vmax*S./(Km + S); plot(S,v);

4 months ago | 0

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