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Rafael Hernandez-Walls


Last seen: Today
1.316 total contributions since 2010

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

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Answered
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(...

alrededor de 22 horas ago | 0

Answered
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...

3 días ago | 0

Answered
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...

18 días ago | 0

| accepted

Answered
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)...

19 días ago | 0

| accepted

Answered
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)

alrededor de 1 mes ago | 0

Answered
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...

alrededor de 2 meses ago | 0

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 ...

3 meses ago | 0

Solved


Mass Conversion 2

4 meses ago

Solved


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

4 meses ago

Solved


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

4 meses ago

Solved


Temperature Conversion 3

4 meses ago

Solved


Temperature Conversion 2

4 meses ago

Solved


Temperature Conversion 1

4 meses 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...

4 meses ago

Solved


Total energy

4 meses ago

Solved


Potential energy calculation

4 meses ago

Solved


Kinetic energy calculation

4 meses ago

Solved


Laws of motion 7

4 meses ago

Solved


Laws of motion 6

4 meses ago

Solved


Laws of motion 5

4 meses ago

Solved


Laws of motion 4

4 meses ago

Solved


Laws of motion 3

4 meses ago

Solved


Laws of motion 2

4 meses ago

Solved


Laws of motion 1

4 meses 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...

5 meses 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)

5 meses 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)

5 meses 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...

5 meses 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;...

5 meses ago | 0

| accepted

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