# David Hill

Electrical Engineering with minors in Computer Science and Mathematics. Working as Undergraduate Research Assistant in the field of Computational Photonics

**Programming Languages:**

Python, C++, C, Java, MATLAB, HTML, Arduino

**Spoken Languages:**

English

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**Content Feed**

The variables X and Y are vectors and Z is scalar. How do I correct the following command line to work in MATLAB : X*Y + Y*Z + X^2 (using comment or disp function)

newArray=x.*y+z*y+x.^2;%assuming you wanted element-element operations

1 day ago | 0

Solved

Easy Sequences 64: Base-14 Arithmetic Function

For an integer , the base-14 arithmetic function, , is defined as follows: Convert to base-14, using the letters '' for digits...

1 day ago

How to iteratively increase the number of power operations

n=10;%how many do you want x=2.^((.5).^(1:n))

1 day ago | 0

| accepted

Solved

Easy Sequences 67: Project Euler Problem 1 - Not Again!!!

You know the drill... Given two integers and , with , find the sum of all positive integers below , that are multiples of any ...

2 days ago

Area in a function

x=-1:.001:1; f=1-x.^4; g=zeros(size(x)); plot(x,g,x,f); x2 = [x, fliplr(x)]; inBetween = [g, fliplr(f)]; fill(x2, inBetwee...

3 days ago | 0

Distance between two set of points in space

Why no loop? Below is oneliner but has an internal loop. C=arrayfun(@(x)vecnorm((A(x,:)-B)'),1:size(A,1),'UniformOutput',false)...

3 days ago | 0

How can I equalize my vector length?

PC=250; FFB=PC; yph=0.1:.01:1.08; FG=3*PC*(1-yph)./(0.98-yph); FE=(1./yph - 1).*(0.02*FG); PG=FE+0.02*FG; EP2=PC*8150*12.0...

3 days ago | 0

How can I change input of function from file to cell array?

Either delete or comment out lines below and change input to data. Verify cell2mat(of your cell array) gives what is expected. O...

3 days ago | 0

| accepted

Iterative insertion of random numbers in matrix

r1=(5*rand(size(X1))-2.5)*1e-9; r2=(5*rand(size(X1))-2.5)*1e-9; Xnew=X1+r1+r2;

3 days ago | 1

| accepted

How to get two arrays from .txt file?

Why not just copy and paste? dL1=[0 0.000424 0.000847 0.001271 0.001694... 0.002118 0.002541 0.002965 0.003812... 0.004659 ...

4 days ago | 1

where is the mistake?

Why not just: w='abcderfrgrhhr'; l=w=='r' l = 1×13 logical array 0 0 0 0 0 1 0 1 0 1 0 0 1...

4 days ago | 0

Solved

determine the sum of decimal part for given matrix

determine the sum of fraction part for the given matrix

4 days ago

For Loop to read rows on a cell array

Not sure if this the correct guess. y=sum(strcmp(yourCell,'BB'),2)/size(yourCell,2);

4 days ago | 0

| accepted

Searching word list for key letters

wordList = {'apples','orange','banana','show','unit'}; ContainList = 'shu'; NotContainList = 'br'; r=wordList(contains(wordLi...

5 days ago | 0

Plotting values from a double array based on information from a cell array

idx=strcmp(yourCell(:,2),'hold')|strcmp(yourCell(:,2),'hold-end'); plot(yourMatrix(idx,1),yourMatrix(idx,3));

5 days ago | 0

how to write delta function

Or use dirac() built-in function function x=delta(x) if x==0 x=inf; else x=0; end

5 days ago | 0

Research of an element in an array

This should work for you as long as there is only going to be a single match or no match K=find(S==X,1); if ~isempty(K) d...

5 days ago | 0

Plotting values from a double array based on information from a cell array

a=strcmp(yourCell(:,2),'max-pressure-evac 60.0'); f=find(a)'; f=f+(0:numel(f)-1); for k=f yourCell(k+1:end+1,:)=yourCell(k...

5 days ago | 0

| accepted

Solved

Time reverse indices

Time reverse the index values as follows IndexIn = [7 1 0] IndexOut = [7 6 0] Note that the indices are zero based and so...

8 days ago

Solved

Wordle

Wordle is an english game where you need to guess a 5 letter word. For each guess you'll receive a feedback for the placement of...

8 days ago

Solved

Determine Fundamental Solution of Pell Equation

Given, a positive value (d), determine the fundamental solution [x, y] of the Pell equation: x^2 - d*y^2 = 1. Provide character...

8 days ago

Problem

Determine Fundamental Solution of Pell Equation

Given, a positive value (d), determine the fundamental solution [x, y] of the Pell equation: x^2 - d*y^2 = 1. Provide character...

8 days ago | 1 | 2 solvers

Solved

expand intervals vol.3

This is the next problem after <http://www.mathworks.co.uk/matlabcentral/cody/problems/2528 2528> and <http://www.mathworks.co.u...

9 days ago

Solved

return row and column indices given 2 values which define a range

Inspired by problem <http://www.mathworks.co.kr/matlabcentral/cody/problems/856-getting-the-indices-from-a-matrice> Inputs: - ...

9 days ago

Solved

Max Change in Consecutive Elements

If an array is given as input then find the index of consecutive elements that represent maximum change. Example: Input ...

9 days ago

Solved

remove single elements

Given a vector of integers, remove the elements that have appeared only once. The output elements should be in exact order as th...

9 days ago

Solved

Still more miles to go before I sleep

It's time for more odometer fun. Last problem, my car's odometer hit 56789. It's coming up on 111111 now, which (barring a maj...

10 days ago

Solved

Permutation Via Multiplication

Given two numbers a and b, determine if the product ab is a permutation of the digits of a. For example, this is always true for...

10 days ago

Solved

Smallest n, for n! to have m trailing zero digits

For given positive integer n, its factorial often has many trailing zeros, in other words many factors of 10s. In order for n! t...

10 days ago