David Hill
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4.111 total contributions since 2017David Hill's Badges
Answer 3 questions that were unanswered for more than 30 days
Awarded to David Hill on 11 Jan 2021
Contribute at least one answer each month for 12 consecutive months
Awarded to David Hill on 02 Aug 2020
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
Your submissions received 5 five star ratings
Awarded to David Hill on 16 Sep 2020
Your submissions were downloaded 100 or more times in a month
Awarded to David Hill on 03 Mar 2020
Publish your first comment or rating
Awarded to David Hill on 09 Oct 2019
Solve all the problems in Cody Challenge
Awarded to David Hill on 24 Feb 2021
Solve all the problems in Computation Geometry I
Awarded to David Hill on 24 Feb 2021
Receive 25 likes on a problem you have created
Awarded to David Hill on 09 Nov 2020
Solve all the problems in Matrix Manipulation I
Awarded to David Hill on 30 Oct 2020
Solve all the problems in Indexing II
Awarded to David Hill on 19 Mar 2020
Solve all the problems in Sequences & Series III
Awarded to David Hill on 14 Feb 2020
How can I select numbers from excel to matlab?
str=readcell('test.xlsx'); %str={'2019-10-12T02:41:27.091Z,1/0669958925:52238,-5.9858581261e-02,-1.7725070822e-04,+1.1940838453...
alrededor de 5 horas ago | 0
How to fix the range of a variable?
Not clear what the question is, but if you just want to randomly sectect 24 digits from 0-3, then: x=randi(4,1,24)-1;
alrededor de 7 horas ago | 0
How to plot the Free particle wave function
a=10; c1=pi*sqrt(2*a); h=(6.626/(2*pi))*10^-34; m=9.11*10^-31; X=-60:.1:60; t=m*a^2/h; V=zeros(1,201); for j=1:length(X) ...
alrededor de 8 horas ago | 0
| accepted
Use Position Values to Keep Values in Matrix
Filled=Filling.*(cumsum(Volume<0,2)==1);
alrededor de 10 horas ago | 0
| accepted
How to find vector elements indices for the first and last locations of a specific number?
[~,idxfirst]=ismember(unique(A),A); [~,idxlast]=ismember(unique(A),flip(A)); idxlast=length(A)+1-idxlast;
alrededor de 12 horas ago | 1
| accepted
How to fitt a power function to data
If you have the curve fitting toolbox. f=fit(x,y,'power1');
alrededor de 22 horas ago | 0
Return the value from a specific excel colomn/row
If you don't provide an example, we don't know what the format of lat/long/temp is in. They might be numbers or strings. a=read...
alrededor de 22 horas ago | 0
Try to solve System of Linear Equations
A=[1 1;10 45;1 3;10 15]; b=[250;24000;3360;1440]; A\b
1 día ago | 0
Sum of the series with two variable
[x,t]=meshgrid(0:.01:1,0:.001:.1); u=zeros(size(x)); for n=1:100 u=u+((-1)^n-1)/(n^2)*exp(-n^2*pi^2*t/10).*sin(n*pi*x); en...
1 día ago | 0
| accepted
I need help with using a while loop
c1 = 0.1; v1 = 0.1; v2 = 1; p = 0; m = 1; while m > 1.000e-5%floating point errors, use > c1 = c1*v1/v2 m = c1*0....
1 día ago | 1
Insert elements of one vector into another in a specific order
B(end+1)=B(end);%B needs 1 more element, just duplicated last element c=[reshape(A,124,[]);reshape(B,2,[])]; c=c(:)';
1 día ago | 1
| accepted
Can't exit a for loop correctly
for num = index_peak-1:-1:1 if ODv(num) > ODv(num+1) baseline = ODv(num+1); break; end end Alterna...
1 día ago | 0
finding the corresponding value in a for loop
[~,idx]=max(sum(img597==0));
1 día ago | 0
| accepted
How can concatenate matrices with dimension expansion.
Why not 25x25x2? img(:,:,1) = imread('0.png'); img(:,:,2) = imread('1.png');
2 días ago | 1
Matrix Dimension Must Agree
theta = linspace(0,2*(pi),629); l = linspace((5.1)*lambda,(7.1)*lambda,629); Azimuth = linspace(0,2*(pi),629);%these all need ...
3 días ago | 0
Read table in .txt to MATLAB
t=readtable('Save_CdCl.txt'); alpha=t.alpha; names=t.Properties.VariableNames; for k=1:length(names) writetable(t(:,k),nam...
3 días ago | 0
How to use linspace on a matrix
yourMatrix=repmat(linspace(.8112,.6,100)',1,13);
3 días ago | 0
How do i save values for each iteration ?
a = [0.01 0.01 0.01 0.03 0.1 0.2 0.3 0.3 0.3 0.4 0.4 0.4 0.3 0.4 0.5 0.8 0.9 1...
4 días ago | 0
| accepted
Not enough input arguments
y =@(x)1./sqrt(1+x.^2)+exp(-x/5).*cos(sqrt(1+x.^2))-0.0486;%I would just use an anonymous function x=0:.01:10; plot(x,y(x));
4 días ago | 0
| accepted
Average values only next to each other in a matrix
I don't think there is an easy way, but a simple loop works. A = [ 62.9; 63; 83.10; 83; 43; 43; 63; 63.2; 83; 83; 62.90; 62.90 ...
4 días ago | 0
| accepted
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