Community Profile # 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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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...

ungefär 11 timmar ago | 0

make a matrix of values from questions from another matrix

ungefär 12 timmar ago | 0

| accepted

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...

ungefär 13 timmar ago | 0

| accepted

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 ...

ungefär 13 timmar ago | 0

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

ungefär 14 timmar ago | 0

| accepted

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);

ungefär 15 timmar ago | 1

| accepted

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

10 dagar ago | 1

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 dagar 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.

13 dagar ago

Solved

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

13 dagar 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 ...

13 dagar 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;

13 dagar 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 ...

13 dagar ago

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

14 dagar ago | 1

| accepted

Cropping images around the center of an image with a particular size

14 dagar ago | 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

14 dagar ago | 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...

14 dagar 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 dagar 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 dagar 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 dagar 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 dagar ago

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...

16 dagar ago | 0

| accepted

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...

16 dagar ago | 0

| accepted

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...

16 dagar ago | 0

| accepted

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));

16 dagar ago | 0

Converting a matrix to string
string(Z);

17 dagar ago | 0

How to plot x and y
t=0:.1:100; x=3*t; y=2t; plot(x,y);

17 dagar ago | 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...

17 dagar ago | 0