Wan Ji
Wuhan University
Research Interest: computational mechanics and modeling the world
Python, C++, C, MATLAB, Fortran
Spoken Languages:
English, French, Mandarin
Statistics
RANK
177
of 244 271
REPUTATION
464
CONTRIBUTIONS
5 Questions
162 Answers
ANSWER ACCEPTANCE
20.0%
VOTES RECEIVED
33
RANK
12 489 of 17 073
REPUTATION
17
AVERAGE RATING
5.00
CONTRIBUTIONS
6 Files
DOWNLOADS
39
ALL TIME DOWNLOADS
120
CONTRIBUTIONS
0 Posts
CONTRIBUTIONS
0 Public Channels
AVERAGE RATING
CONTRIBUTIONS
0 Highlights
AVERAGE NO. OF LIKES
MATLAB Central Community 20 Year Anniversary Treasure Hunt participant badge
Awarded to Wan Ji on 13 Sep 2021
Your submissions received 1 five star rating
Awarded to Wan Ji on 02 Sep 2021
Answer 3 questions that were unanswered for more than 30 days
Awarded to Wan Ji on 24 Aug 2021
20 of your answers have been accepted
Awarded to Wan Ji on 19 Aug 2021
Accept 1 answer given by other contributors
Awarded to Wan Ji on 16 Aug 2021
Solve a problem for the first time
Awarded to Wan Ji on 09 Aug 2021
Provide your first answer ever to someone else's question
Awarded to Wan Ji on 09 Aug 2021
Your submissions were downloaded 30 or more times in a month
Awarded to Wan Ji on 01 Aug 2021
Download any 10 unique submissions
Awarded to Wan Ji on 01 Jul 2021
Publish your first submission
Awarded to Wan Ji on 25 Jun 2021
Publish your first review
Awarded to Wan Ji on 21 Jun 2021
Content Feed
Question
Matlab default font monospace is not a wise choice
Did anyone encounter a problem when writing an m-script on matlab? The problem is that your naked eyes can't tell the number '1'...
18 dagar ago | 1 answer | 0
1
answerHow can I fix my function?
Hey， friend Just try the inline function ispythag = @(a,b,c)a.^2+b.^2 == c.^2; a = ispythag(1,2,3) b = ispythag(3,4,5) Then...
ungefär en månad ago | 0
| accepted
Matlab versions supported on Windows 11?
WINDOWS 11 itself should support running the softwares on win10. ELSE microsoft would not release it and clients would not use i...
ungefär en månad ago | 0
Using ODE45 for first order diff equation with three different variables
For example function dxdt = func(t,x,g) dxdt = zeros(3,1); dxdt(1) = (0.1*x(1))+(0.25*x(2))-(g*x(3)); dxdt(2) = (0.1*x(1))+(...
ungefär en månad ago | 2
| accepted
Solved
The Piggy Bank Problem
Given a cylindrical piggy bank with radius g and height y, return the bank's volume. [ g is first input argument.] Bonus though...
ungefär en månad ago
how to write to solve this type of system of equations ?
Hey friend Just expand the left items of the two equations, extract u'' and v'', then an ode45 solver is there for you.
ungefär en månad ago | 0
multiple graphs in one script
Modified the code as %% 6 x = ([-2*pi:0.1:2*pi]); f = x-sin(x) g = 1-x.*cos(x) figure(1);clf; plot(x,f,x,g) title('f(x) &...
ungefär 2 månader ago | 0
How to check if an array is empty without using any built in functions
Use isempty x = []; isempty(x) Then the answer is ans = logical 1
ungefär 2 månader ago | 1
| accepted
I want to co-relate the local coordinate system with global co-ordinate system of a 8-noded element. How to do it in matlab?
You need to add the element information element_id = 5; % for example, the local element id is 5 selected_element = element(el...
ungefär 2 månader ago | 0
Question
I don't know how to avoid eval
Hi friends from community, I am very confused on how to manage 'eval' function existing in my code, i need it to be removed fro...
ungefär 2 månader ago | 3 answers | 0
3
answersTotal Solution Differential Equation
If u(t) = 1, then your solution is right. If it is a function with respect to time, then your solution is wrong. Exact code: ...
ungefär 2 månader ago | 0
How to plot such figure in MATLAB?
use polarplot theta = 0:0.1:pi; r = 1+0.6*sin(10*theta); polarplot(theta,r); set(gca,'ThetaLim',[0 180]) set(gca,'Rdir','re...
ungefär 2 månader ago | 1
| accepted
How to plot a 3D vortex flow
If you donot have a mesh, then you need to reconstruct your mesh! X = X(:); Y = Y(:); Z = Z(:); U = U(:); V= V(:); W=W(:); min...
ungefär 2 månader ago | 0
| accepted
Saving the regression trained model
You should save the trained model after click the 'export' the model to workspace. (you can see you saved model in workspace) ...
ungefär 2 månader ago | 0
| accepted
Solving 3 simultaneous equations using solve.
Do not use 'pi' use pi instead %define attributes: gamma=21.05; phi=35.55; phi1=0.75*phi; d=0.6; syms L Rs Rb; zc=(0.3*ph...
ungefär 2 månader ago | 0
Solved
Calculate cosine without cos(x)
Solve cos(x). The use of the function cos() and sin() is not allowed.
ungefär 2 månader ago
Solved
Approximate the cosine function
Without using MATLAB trigonometric functions, calculate the cosine of an argument |x| to a precision of |0.0001| *Hint:* You ...
ungefär 2 månader ago
How to add consecutive numbers from a column in a .txt file?
Just use movsum a = [1 1 8 2 3 1]; b = movsum(a,2); % I should apologize for not adding 2 b = b(2:end) The answer b = ...
ungefär 2 månader ago | 1
| accepted
How do i write the function for the taylor polynomial of cos(x) using for loops and no anonymous function
If a large x is selected, then use function Pn = taylor_cos(a,n) x=mod(abs(a),2*pi); % if(x>=pi) x = 2*pi-x; end Pn=1;...
ungefär 2 månader ago | 0
| accepted
How to use sym and function handle(@) in same code
Hi, use matlabFunction, my friend syms theta Ai = cos(theta).*[1 1 2; 4 5 6; 9 1 3] Bi = tan(theta).*[6 9 1; ...
ungefär 2 månader ago | 0
| accepted
How to average first two dimension of 3D array/matrix?
Just use mean function to average first two dimension of 3D matrix a = rand(2,3,4); % I just use rand function so the result is...
ungefär 2 månader ago | 1
Save points or data in right order
I have answered this question before, now I have a better solution to this problem which can identify many connected regions cl...
ungefär 2 månader ago | 0
| accepted
How to make a={'1','2','3','4'} to b={'1234'}
The simple way is a={'1','2','3','4'}; b = {[a{:}]} Answer b = 1×1 cell array {'1234'}
ungefär 2 månader ago | 0
| accepted
how do you sum using loop?
x=1:100; f=@(x)x.*(1+x); S=sum(f(x));%this should be ok %or use loop f=@(x)x.*(1+x); S=0; for i=1:100 S=S+f(i); end...
ungefär 2 månader ago | 0
How to form a sphere with 1's in a 3D matrix
If there is no scale factor effect with different directions: m = 80; n = 100; p=90; [px,py,pz] = meshgrid(1:n, 1:m, 1:p); ra...
ungefär 2 månader ago | 1
| accepted
How to sum the values when they are bigger than 25, 50, 75, (conditional) and they are from the same group?
That's quite simple, you don't need to compare them clc;clear ID = ['1_A' ; '1_A'; '1_A'; '2_B'; '2_B'; '3_C'; '3_C';...
ungefär 2 månader ago | 0
| accepted
How to i change the SNR to Vector?
SNR = -20:10:30; a(numel(SNR)) = helperModClassTestChannel(); for i = 1:1:SNR a(i).SNR = SNR(i); end
ungefär 2 månader ago | 0
Why is it not taking the sqrt function, and how to fix it?
You should transform char format to double then do your work B = str2num(B); H = str2num(H); n = str2num(n); s = str2num(s);...
ungefär 2 månader ago | 0
plot the equation graph
Hi, It is not neccessary to solve this equation x = 0:0.00001:1; f = @(x,m,a)(m*pi+atan((x)/(1-x))+atan((a+x)/(1-x)))./sqrt(1...
ungefär 2 månader ago | 0
How to plot mean with respect to bins?
Hi friend, Use histcounts and histogram, then the work is done clc;clear value = rand(100,1) + 0.1; % lack of your data, i ge...
ungefär 2 månader ago | 0
