David Hill

Last seen: Today | Active since 2017

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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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Double Fibonacci
double_fibonacci takes two integers, each greater than one, as input arguments (it does not have to check the format of the inpu...

alrededor de 5 horas ago

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Sort Except Zeros
Sort the numbers in a vector. But the position of zeros should not be changed. Example: sort_except_zeros( [5 3 0 0 2 4] ) == [...

alrededor de 5 horas ago

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Draw 'S'
draw S using nxn matrix, where n is odd and greater than 4 S = [1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 0 0 0 0 1 ...

alrededor de 5 horas ago

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How to calculate coefficient of variation for every element in Matrix?
cv=std(datan,0,'all')/mean(datan,'all');

alrededor de 7 horas ago | 0

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Save vales in Harry in a for loop
No loop needed. Ri_A=numbA_IntStat./(E_i.*cos(numbGrad).*ds);%assuming all the same sized variables

alrededor de 11 horas ago | 1

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how can i integrate a function which has three variables but has to integrate it with respect to only one variable
For example: syms a b d e t; f=d^2*cos(e)/exp(t); I=int(f,e,a,b);

alrededor de 11 horas ago | 0

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Surface plot from excel data
a=readmatrix('test1.xlsx'); x=a(1,2:end); y=a(2:end,1); z=a(2:end,2:end); [X,Y]=meshgrid(x,y); surf(X,Y,z)

alrededor de 11 horas ago | 0

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I'm new in matlab and I'm having trouble with the coding
x=(2*s*(4*s^2+19*s+20))/(20*s^4+66*s^3+73*s^2+57*s+30);%s is scalar x=(2*s.*(4*s.^2+19*s+20))./(20*s.^4+66*s.^3+73*s.^2+57*s+30...

alrededor de 12 horas ago | 0

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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]...

6 días ago | 0

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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...

7 días ago

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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 ...

7 días ago

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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...

18 días ago

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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 ...

18 días ago

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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...

18 días ago

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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(...

18 días ago | 0

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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...

18 días ago

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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...

18 días ago

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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) ...

18 días ago

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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) ...

18 días ago

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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'

18 días ago

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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 ...

18 días ago

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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...

20 días ago | 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...

20 días ago | 0

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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');

20 días 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

20 días 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...

20 días ago | 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');

20 días ago | 1

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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...

alrededor de 1 mes ago

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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...

alrededor de 1 mes ago

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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)...

alrededor de 1 mes ago

David Hill

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