
David Hill
Electrical Engineering with minors in Computer Science and Mathematics. Working as Undergraduate Research Assistant in the field of Computational Photonics
Python, C++, C, Java, MATLAB, HTML, Arduino
Spoken Languages:
English, Spanish
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Solved
List odd twin composites
Twin primes, or prime numbers that differ by 2 (e.g., 17 and 19, 59 and 61, or 191 and 193), are the subject of several Cody pro...
1 day ago
Index exceeds the number of array elements - Error message
mdata = [1 2 3 4 5 6 7 8 9 10]; k = 1; c = 1; for n1 = 1:2:length(mdata) ma(c) = (1/(k + 1)) * sum(mdata(n1:n1 + k))...
2 days ago | 0
Solved
Convert single-precision floating-point number to binary representation
Write a function which takes a scalar <http://en.wikipedia.org/wiki/Single-precision_floating-point_format single-precision floa...
2 days ago
Solved
Convert base 10 to base x (2-16)
Convert input number(s) (cell array of character arrays) in base 10 to base x (2 through 16). Output should be a cell of charact...
2 days ago
Finding the max value in 1st column of values based on a range in the 2nd column of values
idx=(FFTDataCKASRoll(:,2)>=.09&FFTDataCKASRoll(:,2)<=.11)|... (FFTDataCKASRoll(:,2)>=.19&FFTDataCKASRoll(:,2)<=.21)|... ...
2 days ago | 0
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How to averaging each each row in cell array?
d=cell2mat(dst_allfiles); m=mean(d,2);
3 days ago | 0
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What is the best way to define an output vector in this case?
I assume you mean a 10-element vector. for k=1:1000 yourVector=;%computation to compute your vector yourMatrix(k,:)=y...
12 days ago | 0
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Why does matlab not evaluate equations properly?
syms x f=log(.7*x+.5); x0=4.2857; t=taylor(f,x,x0,'Order',2); a= double(subs(t,6.42855))
12 days ago | 0
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why do I get the wrong angle
Recommend avoiding using symbolics. Seeking numerical solution, use fzero. mo=2.5; y=1.4; angle=10; fun=@(a)((2*(1+((y-1)/2)...
18 days ago | 0
why I get imaginary part using solve function
y=1.4; to3=300; t_star=400; eq4=@(m4)(((2*(y+1)*m4^2*(1+(y-1)/2)*m4^2))/(1+y*m4^2)^2)-to3/t_star; m_4=fzero(eq4,.8)
18 days ago | 0
Append values of nested loop into matrix
r=readmatrix('data_jong_edit.txt'); r(isnan(r(:,1)),:)=[]; u=unique(r(:,1)); for k=1:length(u) re=r(r(:,1)==u(k),:); ...
18 days ago | 0
why my plots are getting replaced after every simulation?
Question is confusing on figure numbering. Below saves 48 figures (16 each of s1, s2, and s3). Since you are saving the figures,...
18 days ago | 0
How to duplicate some values in vector , while each value is duplicate in different number of times?
a=[1 0 2 0 3 0 3 0]; d=4*(a>0)+3*(a==0); n=repelem(a,d);
18 days ago | 0
Why am I getting error "Vectors must be the same length" although they are of same length?
You have two 'Trial40' plot(subject_data.xcoordinates2{find(subject_data.trialname == 'Trial40',1)}, ... subject_data.ycoo...
19 days ago | 1
How to determine the reverse saturation current
missing * and some () in last equation N_a=1.0*10^22; N_d=1.0*10^22; ni=1.5*10^16; D_n=0.0025; tao_p0=5*10^(-7); tao_n0=5*...
19 days ago | 0
Single bit read returning invalid precision
b=fread('a.wdq',1,'ubit1');%this does not work?
19 days ago | 0
Matlab: How to plot the function $P(x)$ versus $x$, where $P(x)=\int_0^\infty f(y)W(x,y)dy$?
y=1:.01:5; x=0:.01:7; [X,Y]=meshgrid(x,y); W=exp(-X.^2./Y); f=y.^2;%as an example I=trapz(W.*f')/.01;%each column of I is t...
19 days ago | 0
How to find elements in common between two cell arrays?
load('B_90.mat'); A=B; load('B_120.mat'); I=intersect(A{1},B{1},'rows');%as an example points in common between A{1} and B{1}...
19 days ago | 1
| accepted
MATRIX PROBLEM IN MATLAB
You are indexing into regime with an array (aa) which is 1:2. Not sure what you want array (aa) to be: j=1:3; aa=1:(j+1);%this...
19 days ago | 0
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Writing a summation code where i≠j
No loops needed G=sum(w.*x.*x','all')/sum(x.*x','all');
22 days ago | 0
How do I replace every value in a column with a value from a lookup table?
interp1(X,Y,A)
23 days ago | 0
| accepted
how to I write sqrt{x}+sqrt{1+x}=4 in mathlab
eqn=@(x)sqrt(x)+sqrt(1+x)-4; f=fzero(eqn,3)
23 days ago | 0
| accepted
Randomly choose one nonzero element in each row of matrix
Need a single loop in third dimension. ex=randi(2,10,17,12)-1; E=permute(ex,[2,1,3]); [r,c]=find(E); N=zeros(size(ex,1),1,si...
23 days ago | 0
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How to write the program for pick the first five element from an array than next five and store their individual sum in new array?
a=randi(100,1,50);%an array n=sum(reshape(a,5,[]));%sum of 5 elements placed in new array
24 days ago | 0
| accepted
How to randomly select an array of 20 nonrepeating values from another array which has 100 values with positive or negative values.
a=randi(200,1,100)-100; SelectArray=a(randperm(100,20));
29 days ago | 0
string text manipulation - adding data based on previous data in the string
m=replace(m,'element1','element1CMD'); m=replace(m,'element2','element2CMD'); m=replace(m,'element3','element3RPT');
1 month ago | 0
The graph is coming out blank
Index and plot after completion of loop. f=@(x,y) -y/.1; x=input('\n Ingrese el valor inicial de x0: '); y=input('\n Ingres...
1 month ago | 1
Solved
Determine whether a number is practical
A number is practical if all smaller numbers can be written as a sum of the proper divisors of . The number 24 is practical bec...
1 month ago
Solved
Matrix Transposition
Given a matrix and an index, perform matrix transposition as follows - Replace non-corner value of ith ring from outside, with...
1 month ago