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# Rafael Hernandez-Walls

1,101 total contributions since 2010

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

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In this problem, you have to add three numbers a, b and c. Give output d = add(a,b,c)

21 days ago

Solved

Angle between two vectors
Given 2 pairs of _cartesian co-ordinates_, determine the angle between the 2 vectors formed by the _points_ and the _origin_. An...

21 days ago

Solved

UICBioE240 problem 1.7
Find the other two angles of a right triangle given the two of the sides. So if A = [1 1] B = [45 45]

2 months ago

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Kepler's Equation
Solve <http://en.wikipedia.org/wiki/Kepler's_equation Kepler's Equation>. Note that the solution is rounded down to 5 decima...

2 months ago

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Sum of diagonals elements of a matrix
Given a matrix, return the sum of all the elements across the diagonals. E.g. A = [1 2 3; 4 5 6; 7 8 9;...

3 months ago

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Set x value to each odd index of vector y.
Set x value to each odd index of vector y.

3 months ago

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Scalar Matrix Manipulation
Assume, input x is a scalar matrix such as, x = 2 0 0 0 2 0 0 0 2 th...

3 months ago

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Vector LCM
* Find Least Common Multiple of a given vector. * Need general solution as the test suite will be expanded. * Function Templa...

4 months ago

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Are you in XY plane?
Take a point P as an input position Vector (x,y,z). If you are in XY plane, return 1 as an output otherwise return 0. Example...

4 months ago

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Gauss Eliminate 2-by-2 example
Use forward elimination to make the coefficient matrix, A, an upper triangular matrix, and then solve using back substitution, f...

4 months ago

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Repeat Vector Values an Arbitrary Number of Times
Given two vectors of the same size, repeat the values of the first vector the number of times given in a second vector. For exam...

4 months ago

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Number Power
Raise a number to itself.

5 months ago

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Cube root of max value in a vector
Find the cube root of the maximum value in a vector

5 months ago

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Testing Problem Creation
This is where MATLAB based question will be

5 months ago

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Determine the number of correct and incorrect answers
In a Multiple Choice Question Test, you are to sort out answer from 4 samples, one of them is correct answer. There are 50 quest...

5 months ago

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Basic matrix operations using standard MATLAB commands
Create the matrix: 1.0e+15 * 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000...

5 months ago

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Nth root of a number
Given an input and a number N, find the Nth root of the number(s)

5 months ago

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Archimedes principle
According to Archimedes principle, the buoyancy force is equal to the weight of fluid displaced by the submerged portion of an o...

5 months ago

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Non trivial identities - reshape
Return x by reshaping it.

5 months ago

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Find the outlier in a set of samples
Given an array x of numbers. Assumed that this array has one outlier. Find the position p and the value v of the outlier in this...

5 months ago

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Non trivial identities - flipping
Return x by flipping it.

5 months ago

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basic matrix operations: rotate and find sum of diagonal elements of the resultant matrix
For given input matrix a, rotate it by 90 degrees and find the sum of the diagonals. Example: Input: a = 1 ...

5 months ago

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Reverse the Matrix
Given a Matrix A, reverse it. Such that, last element of A becomes 1st and vice versa. for example: Input = [1 2 3;4 5 ...

5 months ago

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find number of times of occurrence of the most frequent number in a row vector
In a given row vector, find the number of times a mode of a row vector has occurred example: in [2 5 5 5 5 3], output is 4 ...

5 months ago

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Non trivial identities - summation
Return x by adding a random number to it.

5 months ago

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Second Diagonal
Transpose the matrix from it's second diagonal.

5 months ago

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find the 'M'
for an input x, return 1 at the location of the letter 'M'

5 months ago

Solved

surface of parallelogram
Given 2 vectors of each 3 elements, determine the surface of the parallelogram which can be created from these 2 vectors.

5 months ago

Solved

Xor of matrix
you have to set exclusive OR of two arrays

5 months ago

Solved

Sum two real numbers
It seems easy, but... You cannot use +, -, plus, diff, cumsum, *, prod, times, etc.

5 months ago