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# Rafael Hernandez-Walls

Last seen: 27 dagen ago Active since 2010

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

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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 ...

ongeveer een maand ago

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Calculate Wind Chill Factor
The NWS Wind Chill Temperature (WCT) index formula for calculating the dangers from winter winds and freezing temperatures: Cal...

ongeveer een maand ago

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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...

ongeveer een maand ago

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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...

ongeveer een maand ago

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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...

ongeveer een maand ago

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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?

ongeveer een maand ago

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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; ...

ongeveer een maand ago

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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...

3 maanden ago

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Differential equations I
Given a function handle |f| an initial condition |y0| and a final time |tf|, solve numerically the differential equation dy...

3 maanden ago

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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 ...

6 maanden ago

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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...

ongeveer een jaar ago

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mathematics , probability problem
How many different result can we have, rolling k dice?

meer dan een jaar ago

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MATLAB Basics: Complex Conjugates
For a given complex number, x, return the complex conjugate, y.

meer dan een jaar ago

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MATLAB Basics: Complex Numbers
For a given complex number, x, return the real and imaginary parts as a vector, y = [Real Imaginary].

meer dan een jaar ago

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Flip coins

meer dan een jaar ago

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Normalizing a vector

meer dan een jaar ago

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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: ...

meer dan een jaar ago

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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...

meer dan een jaar ago

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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...

meer dan een jaar ago

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Mass Conversion 1

meer dan een jaar ago

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Mass Conversion 2

bijna 2 jaar ago

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

bijna 2 jaar ago

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

bijna 2 jaar ago

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Temperature Conversion 3

bijna 2 jaar ago

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Temperature Conversion 2

bijna 2 jaar ago

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Temperature Conversion 1

bijna 2 jaar ago

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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...

bijna 2 jaar ago

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Total energy

bijna 2 jaar ago

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Potential energy calculation

bijna 2 jaar ago

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Kinetic energy calculation

bijna 2 jaar ago