David Hill
Electrical Engineering with minors in Computer Science, Mathematics, and Creative Writing.
Working as Undergraduate Research Assistant in the field of Computational Photonics
Statistics
Answer 3 questions that were unanswered for more than 30 days
Awarded to David Hill on 11 Jan 2021
Contribute at least one answer each month for 12 consecutive months
Awarded to David Hill on 02 Aug 2020
Solve all the problems in Sequences & Series II
Awarded to David Hill on 03 Jun 2021
Solve all the problems in Cody5:Easy
Awarded to David Hill on 02 Jun 2021
Your submissions received 5 five star ratings
Awarded to David Hill on 16 Sep 2020
Your submissions were downloaded 100 or more times in a month
Awarded to David Hill on 03 Mar 2020
Solve all the problems in Number Manipulation II problem group
Awarded to David Hill on 06 Apr 2021
Solve all the problems in Draw Letters problem group
Awarded to David Hill on 03 Apr 2021
Solve all the problems in Cody Problems in Japanese problem group
Awarded to David Hill on 10 Mar 2021
Solve all the problems in Cody Challenge
Awarded to David Hill on 24 Feb 2021
Solve all the problems in Computation Geometry I
Awarded to David Hill on 24 Feb 2021
Receive 25 likes on a problem you have created
Awarded to David Hill on 09 Nov 2020
Content Feed
해결됨
Draw a x-by-x matrix 'Denmark flag'(Euro(2020)
Draw a x-by-x matrix 'Denmark flag' using '4' and '1'.(x is odd and bigger than 4) Number 4: Caption S.Kjær and number 1: K.S...
8일 전
해결됨
Draw matrix 'Swiss flag'( Euro 2020)
Draw a x-by-x matrix 'Swiss flag' using '1' and 0.(x is odd and bigger than 4) Example x=5 ans = [1 1 1 1 ...
8일 전
해결됨
Find numbers in the Popular Computing Z-sequence
Here’s a quick one. In 1977 the magazine Popular Computing sought “problem situations for which the computer is the best (if not...
8일 전
Improving the speed of a double for loop through vectorization or changing summation indices
What is rep doing? Seems to just be multiplying. for rep = 1:10000 for p=0:N_M_min for q=0:p coeff(p+1) = coeff(...
8일 전 | 0
해결됨
List Honaker primes
The number 131 is the 32nd prime number. It is a Honaker prime because the sum of its digits (1+3+1) equals the sum of the digit...
8일 전
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Hoax Numbers
A Hoax Number (OEIS A019506) is defined as a composite number, whose sum of digits is equal to the sum of digits of its distinct...
8일 전
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Palindromic Prime
Palindromic Prime is a prime number that is also a palindromic number. (Wiki, OEIS) If given a monotonic series (increment=1) ...
9일 전
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Bessel Polynomials
Return the n-th Bessel polynomial Assume that n is a non-negative finite integer. bessel_poly(0) ans = 1 bessel_poly(1) ...
9일 전
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Which Prime
Given two prime numbers, specify the relation between them i.e. - 'Twin Prime', 'Cousin Prime', 'Sexy Prime' or 'None'
9일 전
해결됨
Generate a matrix as follows
write a Function that gives like the following for a random n: n=2 ans= [ 0 1 1 0] n=6 ans= [ 0 ...
9일 전
A simple rout algorithm in finding the way from point (0,0) to a random point (x1,y1) in a block
I would use a graph. M=zeros(100);%adjacency matrix start r=randperm(100,11);%ten random nodes with last node the end point e...
10일 전 | 1
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How to use multiple break statments
for i = 1:100 if ~(sln2.Error<=1) Ext.W22=beta*Ext.W22; Ext.W22List(i) = Ext.W22; end sln3.Erro...
10일 전 | 0
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Find minimum and maximum from same matrix
m=yourMatrix; m(m<=0)=inf; Min=min(m,[],'all'); m=yourMatrix; m(m>=0)=0; Max=-max(abs(m),[],'all');
10일 전 | 0
Find Consecutive numbers and print value in next collumn
Simple loop works c=0; f(:,6)=0; for k=1:size(f,1) if f(k,5)==1 c=c+1; f(k,6)=c; else c=0; end end
10일 전 | 1
Check every element of an array with if statement
z = [0.2+(-500:.05:500)*1i]; R = (z-1)./(z+1); x = abs(R); idx=x<=1; plot(real(R(idx)),imag(R(idx)),'b'); title('R Pla...
10일 전 | 0
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Producing all combinations of a vector with replacement
[x,y]=meshgrid(1:4); z=unique(sort([x(:),y(:)],2),'rows');
11일 전 | 1
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해결됨
Back to basics 13 - Input variables
Covering some basic topics I haven't seen elsewhere on Cody. Return as a string the name of the input variable to the functio...
22일 전
해결됨
Back to basics 4 - Search Path
Covering some basic topics I haven't seen elsewhere on Cody. Return a string that is the user's portion of the current search...
22일 전
해결됨
N-Cards Problem
You have a deck of _N_ cards numbered in order from 1 to _N_. You discard the top card (card 1) and place the next card (card 2)...
22일 전
해결됨
Determine if a Given Number is a Triangle Number
*Description:* Determine if the elements of an input array are triangle numbers and return the result as an array with the sa...
22일 전
Cicle for read data.
for k=0:95 T= sprintf("M3%d.dat",k); M3{k+1}= readtable(T, opts);%must start indexing at 1 end
23일 전 | 0
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How do I solve the double integral r dr d theta from 0,pi/2 and 0,4
syms r theta a=int(int(r,'theta',0,pi/2),'r',0,4);
23일 전 | 1
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Problems in for loop with cell array
Why not just use fit() function x=0:.01:2*pi; y=(5+.05*randn(size(x))).*sin((3+.05*randn(size(x))).*x); f=fit(x',y','sin1'); ...
23일 전 | 0
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How do I solve the triple integral xz^2siny from 0,pi/2,0,pi/2,1,2?
syms x y z; eqn=x*z^2*sin(y); a=int(int(int(eqn,'x',0,pi/2),'y',0,pi/2),'z',1,2);
23일 전 | 0
HOW CAN I PLOT THIS?
load('EXAMPLE.mat'); m=table2array(GIULIAMMEQ1); d=datenum(m(:,1)); v=str2double(m(:,2)); idx=~isnan(v); plot(d(idx),v(idx)...
23일 전 | 0
해결됨
Compute the effective conductivity of a heterogeneous aquifer
Slow flow through soil or another porous medium follows Darcy’s law, which relates the flow of water to the gradient in piezome...
23일 전
해결됨
Pick the die most likely to win
After discussing Rock, Paper, Scissors, Lizard, Spock in The Simpsons and their Mathematical Secrets, Simon Singh writes that in...
23일 전
해결됨
create a function that give us like the following
x=3 y= [1 -1 -1 0 1 -1 0 0 1]; -------------------------------- x=5 y= [ 1 -1 -...
23일 전
I need to make groups from array
Some guessing. You only said it stays in group is greater by 1-5%, I assumed a new group otherwise. Anyways, you modify the belo...
24일 전 | 1
