Community Profile

# Wan Ji

### Wuhan University

Last seen: 3 meses hace Con actividad desde 2021

Research Interest: computational mechanics and modeling the world

Programming Languages:
Python, C++, C, MATLAB, Fortran
Spoken Languages:
English, French, Mandarin

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Resuelto

Prime factor digits
Consider the following number system. Calculate the prime factorization for each number n, then represent the prime factors in a...

4 meses hace

Resuelto

Alphabetize by last name
Given a list of names in a cell array, sort the list by the last name. So if list = {'Barney Google','Snuffy Smith','Dagwood ...

4 meses hace

Resuelto

3D indexes
Generalisation in 3 dimensions of the <http://nl.mathworks.com/matlabcentral/cody/problems/43117-2d-indexes Problem 43117. 2D I...

4 meses hace

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Insert zeros into vector
Insert zeros after each elements in the vector. Number of zeros is specified as the input parameter. For example: x = [1 ...

4 meses hace

Resuelto

Interpolator
You have a two vectors, a and b. They are monotonic and the same length. Given a value, va, where va is between a(1) and a(end...

4 meses hace

read abaqus input file to get the nodes and elements
This readinp function can load the node and element data from abaqus inp file.

11 meses hace | 11 descargas |

Respondida
How to show node/element numbers on the boundary ONLY?
Hi, friend, Here are some tips for you. Firstly, you can find those edges (an edge is generally denoted by two nodes) that are...

alrededor de 1 año hace | 0

Respondida
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...

alrededor de 1 año hace | 0

Pregunta

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'...

más de 1 año hace | 1 respuesta | 0

### 1

respuesta

Respondida
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...

más de 1 año hace | 0

Respondida
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...

más de 1 año hace | 0

Respondida
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))+(...

más de 1 año hace | 2

Resuelto

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...

más de 1 año hace

Respondida
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.

más de 1 año hace | 0

Respondida
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) &...

más de 1 año hace | 0

Respondida
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

más de 1 año hace | 1

Respondida
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...

más de 1 año hace | 0

Pregunta

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...

más de 1 año hace | 3 respuestas | 0

### 3

respuestas

Respondida
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: ...

más de 1 año hace | 0

Respondida
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...

más de 1 año hace | 1

Respondida
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...

más de 1 año hace | 0

Respondida
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) ...

más de 1 año hace | 0

Respondida
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...

más de 1 año hace | 0

Resuelto

Calculate cosine without cos(x)
Solve cos(x). The use of the function cos() and sin() is not allowed.

más de 1 año hace

Resuelto

Approximate the cosine function
Without using MATLAB trigonometric functions, calculate the cosine of an argument |x| to a precision of |0.0001| *Hint:* You ...

más de 1 año hace

Respondida
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 = ...

más de 1 año hace | 1

Respondida
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;...

más de 1 año hace | 0

Respondida
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; ...

más de 1 año hace | 0

Respondida
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...

más de 1 año hace | 1

Respondida
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...

más de 1 año hace | 0