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David Hill


Last seen: 3 giorni ago Active since 2017

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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Answered
Multiply each element of a matrix by different element from another matrix
massg=10^-5:10; %mass [g] mass=massg/1000; %mass [kg] Ra_leo=2000; Ra_geo=35786; % altitude[km] R=6378; %Radius of Earth [km]...

3 giorni ago | 0

Solved


Method of Common Differences part-2
This is the inverse problem to <http://www.mathworks.com/matlabcentral/cody/problems/1485 Problem 1485>. Problem 1485 illustra...

4 giorni ago

Solved


Method of Common Differences part-1
Use the method of common differences to output a vector containing the initial values and the nth order difference. ex ...

4 giorni ago

Solved


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...

14 giorni ago

Solved


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 ...

14 giorni ago

Solved


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...

14 giorni ago

Answered
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(...

15 giorni ago | 0

Solved


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...

15 giorni ago

Solved


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...

15 giorni ago

Solved


Palindromic Prime
Palindromic Prime is a prime number that is also a palindromic number. (Wiki, OEIS) If given a monotonic series (increment=1) ...

15 giorni ago

Solved


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) ...

15 giorni ago

Solved


Which Prime
Given two prime numbers, specify the relation between them i.e. - 'Twin Prime', 'Cousin Prime', 'Sexy Prime' or 'None'

15 giorni ago

Solved


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 ...

15 giorni ago

Answered
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...

16 giorni ago | 1

| accepted

Answered
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...

16 giorni ago | 0

| accepted

Answered
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');

16 giorni ago | 0

Answered
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

17 giorni ago | 1

Answered
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...

17 giorni ago | 0

| accepted

Answered
Producing all combinations of a vector with replacement
[x,y]=meshgrid(1:4); z=unique(sort([x(:),y(:)],2),'rows');

17 giorni ago | 1

| accepted

Solved


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...

28 giorni ago

Solved


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...

28 giorni ago

Solved


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)...

28 giorni ago

Solved


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...

28 giorni ago

Answered
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

29 giorni ago | 0

| accepted

Answered
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);

29 giorni ago | 1

| accepted

Answered
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'); ...

29 giorni ago | 0

| accepted

Answered
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);

29 giorni ago | 0

Answered
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)...

29 giorni ago | 0

Solved


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...

29 giorni ago

Solved


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...

30 giorni ago

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