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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MATLAB Central Community 20 Year Anniversary Treasure Hunt participant badge
Awarded to David Hill on 14 Sep 2021
Contribute at least one answer each month for 24 consecutive months
Awarded to David Hill on 02 Aug 2021
Answer 3 questions that were unanswered for more than 30 days
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Like a problem or solution
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Solve all the problems in Sequences & Series II
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Solve all the problems in Cody5:Easy
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Solve all the problems in Number Manipulation II problem group
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Solve all the problems in Draw Letters problem group
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Solve all the problems in Cody Problems in Japanese problem group
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Solve all the problems in Cody Challenge
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Content Feed
How can I find same arrays in cell of arrays?
c=1; for m=1:41 for n=m+1:42 if isequal(A{m}(:,1:2),A{n}(:,1:2)) idx(c,:)=[m,n];%index pairs that have matchi...
17 hours ago | 0
How to retrieve the list of numbers from which the average of a normal simulation is derived?
n = 5000; %Number of Simulations, sample size x1 = 75:125; %Mean simulation range y1 = 1:40; %Standard Deviation range N=...
18 hours ago | 0
| accepted
How to do math to entirety of a vector?
[1:selectSpaces(1),diff(selectSpaces)+1:selectSpaces(2)];
18 hours ago | 0
Solved
Create a square matrix with given conditions
Create a square matrix, M, which should be populated as follows: M = [ n^2 n * (n-1) n * (n-2) ... n * 2 n * ...
2 days ago
Solved
Set x value to each odd index of vector y.
Set x value to each odd index of vector y.
2 days ago
Solved
Find the sines of an isosceles triangle when given its area and height
Find the sines of an isosceles triangle when given its area and height. For example, when A=60 and h=5, the result is [0.3752...
2 days ago
Solved
Convert array of decimal numbers into hexadecimal numbers array.
Convert array of decimal numbers into hexadecimal numbers array. Example x =[ 32 33 34 35 36 37 38 ...
2 days ago
Solved
Tridiagonal matrix
Given vectors u and v, make a tri-diagonal symmetric matrix such that u is in the main diagonal and v is below and above diagona...
2 days ago
Solved
Calculate feeling temperature before climbing a mountain
I sometimes climb a mountain. As is well known, when the altitude becomes 100 (m) higher, the temperature lowers by 0.6 degrees...
2 days ago
Solved
Delete the column with all 0 !
Delete the column with all 0 data in a matrix(x). e.g. input x = 1 0 0 4 5 0 7 0 ...
2 days ago
Solved
Average of odd values
Find the average of odd values in given a matrix. e.g x=[ 4 11 8 ; 9 2 7 ] y =( 11 + 9+ 7 ) / 3
2 days ago
Solved
Average of even-numbered columns
Given a vector, find the average of even-numbered columns. e.g x = [ 4 6 8 9 1 2 7 ] y = ( 6 + 9 + 2 ) / 3
2 days ago
Solved
Remove multiples of N
in the vector x remove all multiples of N. x = [1 2 3 4 5 6]; N = 2; Then y = [1 3 5];
3 days ago
Solved
Binary Inversion
Given the unsigned 8-bit integer x, return the number y which is the binary inversion of x. For example if x is 5, y should b...
3 days ago
Solved
Count the numbers
In a array x, count the number of times the number n appears in x. for example: x = [1 2 3 4 3 2 1 2] and n = 2 the answer sh...
3 days ago
Solved
Counting votes
x is a vector of votes, e.g. x=[1 2 3 2 2 1 3 2 1 2 2 2 2], who is the winner? 1,2,3?
3 days ago
Solved
Odd times even numbers in a matrix
First count the number of odd numbers in x, then the number of even. Return their product. example: x = [1 2] One odd ...
3 days ago
Solved
Add the even numbers
Add only the even numbers of x example: x = [1 2 3 4 5] the positive numbers are: 2 4, so their sum is 6
3 days ago
Solved
Add the odd numbers
Add only the odd numbers of x example: x = [1 2 3 4 5] the positive numbers are: 1 3 5, so their sum is 9
3 days ago
Solved
All odd - all even
All odd numbers in x are added, while all even numers are subtracted from this. example: x = [1 2 3 4 5]; y = +(1+3+5)-...
3 days ago
Solved
Second smallest number
What is the second smallest number in x? example: x = [1 2 3 4 5 6 7 8 9] y = 2
3 days ago
Solved
Odd times 3
Given a input matrix x, multiply all odd values by 3. Even values remain the same. example: x = [1 2 3 4 5;... 6 7...
3 days ago
Solved
Add the positive numbers
Add only the positive numbers of x example: x = [-2 -1 0 1 2 3] the positive numbers are: 1 2 3, so their sum is 6
3 days ago
Solved
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:...
3 days ago
Solved
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...
5 days ago
Solved
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 ...
5 days ago
How to reset a variable in a for loop?
Use indexing. X=1+rand(1,10); for i=1:10 Y=X(i)+5;%whatever you do. end
5 days ago | 0
