Wan Ji
Wuhan University
Research Interest: computational mechanics and modeling the world
Python, C++, C, MATLAB, Fortran
Spoken Languages:
English, French, Mandarin
Statistics
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
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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
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Download any 10 unique submissions
Awarded to Wan Ji on 01 Jul 2021
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Awarded to Wan Ji on 21 Jun 2021
Content Feed
Call a folder from desktop and use images inside it
Hey, friend, Using uigetfile is a nice choice, for example [file,path,indx] = uigetfile( ... {'*.jpg;*.png;*.tiff;*.tif;*.bmp...
約17時間 前 | 0
質問
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'...
約2ヶ月 前 | 1 件の回答 | 0
1
回答How 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...
2ヶ月 前 | 0
| 採用済み
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...
3ヶ月 前 | 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))+(...
3ヶ月 前 | 2
| 採用済み
解決済み
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...
3ヶ月 前
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.
3ヶ月 前 | 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) &...
3ヶ月 前 | 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
3ヶ月 前 | 1
| 採用済み
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...
3ヶ月 前 | 0
質問
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...
3ヶ月 前 | 3 件の回答 | 0
3
回答Total 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: ...
3ヶ月 前 | 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...
3ヶ月 前 | 1
| 採用済み
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...
3ヶ月 前 | 0
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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) ...
3ヶ月 前 | 0
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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...
3ヶ月 前 | 0
解決済み
Calculate cosine without cos(x)
Solve cos(x). The use of the function cos() and sin() is not allowed.
3ヶ月 前
解決済み
Approximate the cosine function
Without using MATLAB trigonometric functions, calculate the cosine of an argument |x| to a precision of |0.0001| *Hint:* You ...
3ヶ月 前
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 = ...
3ヶ月 前 | 1
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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;...
3ヶ月 前 | 0
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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; ...
3ヶ月 前 | 0
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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...
3ヶ月 前 | 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...
3ヶ月 前 | 0
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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'}
3ヶ月 前 | 0
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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...
3ヶ月 前 | 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...
3ヶ月 前 | 1
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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';...
3ヶ月 前 | 0
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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
3ヶ月 前 | 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);...
3ヶ月 前 | 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...
3ヶ月 前 | 0
