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
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
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Answer 3 questions that were unanswered for more than 30 days
Awarded to David Hill on 11 Jan 2021
Like a problem or solution
Awarded to David Hill on 23 Sep 2021
Solve all the problems in Sequences & Series II
Awarded to David Hill on 03 Jun 2021
Your submissions received 10 five star ratings
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Your submissions were downloaded 100 or more times in a month
Awarded to David Hill on 03 Mar 2020
Solve all the problems in Cody5:Easy
Awarded to David Hill on 02 Jun 2021
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
Content Feed
Not enough Input arguments in integral function
s=0:100; for t=1:numel(s) fun_W=@(k)real(c_k(k))./k.*sin(k*s(t)); W(t)=2/pi*integral(fun_W,0,Inf); end fu...
12日 前 | 1
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Find hen's weight.
If hen weights x kilos on two legs, how much does it weights on one leg? Output the result.
12日 前
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Opposite task convert binary numbers array into array of decimal numbers.
Opposite task convert binary numbers array into array of decimal numbers. Example x=[ 11001000 ; 11001001 ; 11001010 ...
12日 前
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Solve expression II
Solve given expression. alpha=0.1(-x-y-50)/(exp((-x-y-50)/10)-1) beta=5exp((-x+y-60)/20) result=alpha+beta;
12日 前
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Find product of eigenvalues of n*n magic matrix.
Find product of eigenvalues of n*n magic matrix. Example n=3 Matrix= [ 8 1 6; 3 5 7; 4 ...
12日 前
Cropping images around the center of an image with a particular size
I=imread('FP00000s323d04u_01.png'); i=I(144:367,144:367,:); imshow(i);
13日 前 | 0
Too many for loops, how to approach rearranging arrays problem differently?
a=1:10; b=10:19; sa=0;sb=0; for k=2:numel(a) sa=sa+sum(nchoosek(a,k),'all'); sb=sb+sum(nchoosek(b,k),'all'); end
13日 前 | 0
How can I fix random numbers in a for loop?
t=1:.1:10; for k=1:10 s1=randi(5)*sin(1*t)+randi(5)*sin(2*t); s2=randi(5)*sin(1*t)+randi(5)*sin(2*t); Diff(k)=(s1-s2); e...
13日 前 | 1
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Give prime Numbers upto n
You are given a input number x; print all the prime numbers less than equal to x.
15日 前
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Matrix rotation as per given angle
Given a user defined matrix and angle of rotation, rotate the elements of output matrix as clockwise or anti-clockwise. Angle wi...
15日 前
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Distance between two GPS Coordinates
A problem that arises when performing geographically weighted regression is determining the distance between GPS coordinates. GI...
15日 前
解決済み
Toolbox check part 3
In my ongoing quest to highlight obscure parts of MATLAB, the latest challenge is to take 2 string inputs, one a MATLAB toolbox ...
15日 前
For loop broken ?
rho = (20-h(n)/1000)/(20+h(n)/1000)*1.225;%h(n) is always going to be zero rho = (20-h(n-1)/1000)/(20+h(n-1)/1000)*1.225;%did y...
15日 前 | 0
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How to save for loop output to column vector
No loops needed, although you never defined hbar. fvf= 2888.7; ccm = 3*10^8*100; h = 6.63*10^-34; v1 = ccm*fvf; invAvkg = 1...
15日 前 | 0
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Function Approximation and Interpolation
Something like this. f = @(x) exp(-x.^2); x = linspace(-1, 1, 9); G=vander(x); y=f(x); c=G\y'; f1=@(x)polyval(c,x); t=lin...
15日 前 | 0
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Finding top and bottom 10% of data
n=round(.1*numuel(yourMatrix)); [~,idx]=sort(yourMatrix); bottom=yourMatrix(idx(1:n)); top=yourMatrix(idx(end-*n+1:end));
15日 前 | 0
Can someone please debug my code?
You need to use some cell arrays since the number of lines is different in the loops. Also the calculation for Q has something w...
16日 前 | 0
Apply the same matrix index to another matrix (bootstrap for matrix processes)
g=[]; [a,b]=size(indices); for k=1:b g=[g,vector(repmat(indices(:,k),1,b)+[0:a:(b-1)*a])]; end
17日 前 | 0
How can I solve an equation with 4 vectors of unequal length?
Use ndgrid() g = 9.80665; mb = 1:0.5:20; r = 0.01:0.01:0.15; omega = 1800:1000:20000; omegarad =...
18日 前 | 1
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please help me with this calculus question
No reason to use symbolics. round(sum((-1).^(2:58)./(1:57).^2),4);
18日 前 | 0
why is my code giving me a parse error
x=0.1; %beats=A(1,30); There is no A defined and you are indexing into it! for k=1:30 A(k)=2*x*(1-x); %need 2*, if you wan...
18日 前 | 0
When I try to solve this equation, this message appears, how can I solve this problem?
k=2.7904; R=0.20491; syms a Eqn=a./(1+(2*k*(1-a))+(1+(2*k/3)).*(sqrt(3*(1-a))))==R;%messed equation up (need k*(1-a)) s = v...
18日 前 | 1
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Using fzero to find values of B for given values of A
A=5:5:25; for k=1:numel(A) fun = @(x) (1-0.5*cos(A(k))-1.2*cos(x)).^2+(0.5*sin(A(k))+1.2*sin(x)).^2 -1; B(k)=fzero(fun,1)...
18日 前 | 1
Get the position of the next in row and next in column in a matrix
matlab indexing is down and then across. A=[1 0 -2 0 0;2 8 0 1 0;0 0 3 0 -2;0 -3 2 0 0;1 2 0 0 -4]; a=A';%gets your indexing ...
18日 前 | 0
Delete values from two column vectors with same position
m=[A,B,C];%need to form matrix m(ismember(m(:,2),[8 9 10]),:)=[];%entire rows are deleted where 8,9,10 are in column 2 (B) m(i...
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