David Hill

Last seen: Today | Active since 2017

Electrical Engineering with minors in Computer Science and Mathematics. Working as Undergraduate Research Assistant in the field of Computational Photonics

Programming Languages:
Python, C++, C, Java, MATLAB, HTML, Arduino
Spoken Languages:
English, Spanish

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Answered
How to replace unique interval of columns in each row of a matrix with zero?
Why is a for-loop not acceptable? for k=1:length(idx_column) A1(k,1:idx_column(k))=0; end

2 jours ago | 0

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...

5 jours ago

Answered
I have matrix K and Z
s=logical(sum(Z,2)); K(s,:)=0;

5 jours ago | 0

Answered
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))...

6 jours 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...

6 jours 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...

6 jours ago

Answered
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)|... ...

6 jours ago | 0

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Answered
How to averaging each each row in cell array?
d=cell2mat(dst_allfiles); m=mean(d,2);

7 jours ago | 0

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Answered
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...

16 jours ago | 0

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Answered
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))

16 jours ago | 0

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Answered
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)...

22 jours ago | 0

Answered
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)

22 jours ago | 0

Answered
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),:); ...

22 jours ago | 0

Answered
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,...

22 jours ago | 0

Answered
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);

22 jours ago | 1

| accepted

Answered
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...

23 jours ago | 1

Answered
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*...

23 jours ago | 0

Answered
Single bit read returning invalid precision
b=fread('a.wdq',1,'ubit1');%this does not work?

23 jours ago | 0

Answered
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...

23 jours ago | 0

Answered
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}...

23 jours ago | 1

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Answered
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...

23 jours ago | 0

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Answered
Writing a summation code where i≠j
No loops needed G=sum(w.*x.*x','all')/sum(x.*x','all');

26 jours ago | 0

Answered
How do I replace every value in a column with a value from a lookup table?
interp1(X,Y,A)

27 jours ago | 0

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Answered
how to I write sqrt{x}+sqrt{1+x}=4 in mathlab
eqn=@(x)sqrt(x)+sqrt(1+x)-4; f=fzero(eqn,3)

27 jours ago | 0

| accepted

Answered
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...

27 jours ago | 0

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Answered
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

28 jours ago | 0

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Answered
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));

environ un mois ago | 0

Answered
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');

environ un mois ago | 0

Answered
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...

environ un mois 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...

environ un mois ago

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