# David Hill

Electrical Engineering with minors in Computer Science, Mathematics, and Creative Writing.

Working as Undergraduate Research Assistant in the field of Computational Photonics

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Easy Sequences 22: Sum of Proper Fractions

Let 'F' be the set of all proper fractions in lowest term, whose denominator is less than or equal 'd'. So, for d = 10, we have:...

6 hours ago

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A matrix of introverts

You are given a matrix full of numbers who happen to be very shy. Write a MATLAB function that will put a square of zeros aroun...

2 days ago

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Determine value using Look-up table method

Given a set of 2 vectors x and y related in a certain way, you are supposed to find value of y (ydash) given a particular value ...

2 days ago

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Delete the rows in the middle

We will delete the rows in the middle and keep the first and the last rows. For example if input is [1 2 1 7 1 8 ...

2 days ago

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Consecutive Powers

Return 2 numbers and 2 powers such that their difference is 1 A 4 element row vector is expected: x where x(1)^x(2) - x(...

2 days ago

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Easy Sequences 20: Counting Prime-sided Rectangles

A prime-sided rectangle is a rectangle having sides represented by prime numbers. The figure below shows all the possible prime-...

6 days ago

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Matrix which contains the values of an other matrix A at the given locations.

If you have two matrices, which together give xc and yc coordinates into another matrix, eg : xc = [1 1 1; 2 2 1]; ...

6 days ago

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No Twins?

Write a function that accepts as input a vector and returns the same vector, but retaining only the first occurrence of an eleme...

6 days ago

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Find the elements of a matrix according to a defined property.

From A = [5,2,3] and B = [1,2,3,4,5,6,7,8,9,10] produce a vector C where : C(1) is the sum of the first A(1) elements of B, ...

6 days ago

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A quadrant matrix

Write a function called quadrants that takes as its input argument a scalar integer named n. The function returns Q, a 2n-by-2n ...

6 days ago

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Find the distance traveled by a car given velocity and time.

A car is traveling at a constant velocity for a specific amount of time. The function should use the two inputs, velocity and ti...

6 days ago

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Where is the number that you want to find?

For a given matrix A, find where the input number x appears. Do this task by returning the vector which contains the row and th...

6 days ago

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Sum the rows

Sum the rows of the given matrix. Example x = [ 1 2 3 4 ] y = [ 3 7 ]

6 days ago

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Make an identity matrix whose diagonal elements are 1:n

For a given input n, make an n by n identity matrix that contains the elements 1:n along its diagonal. For example, if input=5: ...

6 days ago

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Increment up an input vector

Increment up an input vector by adding the indices to the vector values. For example, if an input vector is [3, 2, 6, 1, 6], the...

6 days ago

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Pairwise column flip

Given matrix *M_in*, flip every pair of columns. So if *M_in* is 1 2 3 4 1 2 3 4 then *M_out* is 2 1 4 3 2 1 4 3 ...

6 days ago

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Matrix Generation from Vector Multiplication

Output the matrix generated from multiplying two vectors together

7 days ago

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String Delimination and Outputting

In this problem, take an incoming string and deliminate the string based on spaces. Output the first string in between the space...

7 days ago

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Check if inputted variable is a string or a number

Check if a inputted variable is a number or a string, given a string input (i.e. '1' is 1 and thus a number, 'a' is a string).

7 days ago

Solved

Automatic String Editing

In this function, you will take an incoming string, and output the same string with each character one letter later in the alpha...

7 days ago

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Matrix element wise multiplication

Take two incoming vectors, and multiply them element wise

7 days ago

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Vector indexing: lower than mean

Find all values in a vector lower than the mean of the vector

7 days ago

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Vector Element Multiplication

Take two incoming vectors, and output the element wise multiplication of the vectors.

7 days ago

Solved

More Simple String Concatenation

Take the first string input, reverse the order of the string from the end to beginning (i.e. apple becomes elppa), add a space a...

7 days ago

Solved

Simple String Concatenation

This is a simple problem involving taking two incoming strings, and outputting the concatenated string with a space separating t...

7 days ago

Solved

Replace 0 indices in array with 1's

Take a incoming vector, and replace 0's with ones

7 days ago