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David Hill


Last seen: Today 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
what does the "oldx =[x(n);oldx(1:256)]" in the following programm do?
for n = 1: 256000 oldx =[x(n);oldx(1:255)];%just reforming the oldx array with x(n) on top and then the next 255 elements of ...

ongeveer een uur ago | 0

| accepted

Answered
Count rows in a table that contain specific letters
nnz(contains(companyNamesJoiner.company,'DEAD - DELIST'));

ongeveer een uur ago | 0

Answered
summations and selections of the columns of a matrix
newMatrix=[yourMatrix(1,:);flipud(cumsum(flipud(yourMatrix(2:end,:))))];

ongeveer 4 uur ago | 0

| accepted

Answered
How can i solve this problem
Show me what you have tried for the C(k) equation above. function C= FourierSeries(x,MaxK) N=length(x); n=0:N-1; for k=1:2*M...

ongeveer 5 uur ago | 0

Answered
I am unsure of how I am getting this error
r=linspace(0.001,1,1000); s=0.75*((r.^3)./(exp(1).^(.75*r)));%error is here (multiplying by scalar does not need .*, but you ne...

ongeveer 20 uur ago | 0

Answered
make a matrix of values from questions from another matrix
qo = 2*[1,0,1,0]; set(0, 'DefaultUIControlFontSize', 20); LoadType=ones(size(qo)); for k=find(qo) LoadType(k) = menu...

ongeveer 20 uur ago | 0

| accepted

Answered
For loop and matrices w/ different elements?
B(i)=[m2.*A2x(i); m2.*A2y(i); I2*a2; m3*A3x(i); m3*A3y(i); I3*a3(i); m4*A4x(i)-F4x(i); 0];%ne...

ongeveer 21 uur ago | 0

| accepted

Answered
How to code with for loop loops without using ndgrid?
count=0; for c=5:6 for b=3:4 for a=1:2 count=count+1; d(count,:)=[a,b,c]; end ...

ongeveer 21 uur ago | 0

Answered
How to divide a vector into small groups
x=randi(100,30,1); X=reshape(x,2,[]); [~,idxGroup]=find(X==x(15));

ongeveer 23 uur ago | 0

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Answered
Extracting the sub-matrix
A = [1 2 3; 4 5 6; 7 8 9]; B=A(1:2,2:3); E=blkdiag(zeros(2),A);

ongeveer 23 uur ago | 1

| accepted

Answered
plotting a 2-colum 2d array
plot(a(:,1),a(:,2));

11 dagen ago | 1

Answered
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...

13 dagen ago | 1

| accepted

Solved


Find hen's weight.
If hen weights x kilos on two legs, how much does it weights on one leg? Output the result.

14 dagen ago

Solved


Count given word x in text.
Count how many times given word x repeats in text.

14 dagen ago

Solved


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 ...

14 dagen ago

Solved


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;

14 dagen ago

Solved


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 ...

14 dagen ago

Answered
How can I sum each 3 columns array?
m=movsum(x,3); y=m(:,1:3:end);

14 dagen ago | 1

| accepted

Answered
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);

14 dagen ago | 0

Answered
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

14 dagen ago | 0

Answered
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...

14 dagen ago | 1

| accepted

Solved


Give prime Numbers upto n
You are given a input number x; print all the prime numbers less than equal to x.

16 dagen ago

Solved


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...

16 dagen ago

Solved


Distance between two GPS Coordinates
A problem that arises when performing geographically weighted regression is determining the distance between GPS coordinates. GI...

16 dagen ago

Solved


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 ...

16 dagen ago

Answered
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...

17 dagen ago | 0

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Answered
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...

17 dagen ago | 0

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Answered
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...

17 dagen ago | 0

| accepted

Answered
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));

17 dagen ago | 0

Answered
Converting a matrix to string
string(Z);

17 dagen ago | 0

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