# Wan Ji

### Wuhan University

Research Interest: computational mechanics and modeling the world

**Programming Languages:**

Python, C++, C, MATLAB, Fortran

**Spoken Languages:**

English, French, Mandarin

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REPUTATION**482**

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**5** Questions

**164** Answers

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VOTES RECEIVED**36**

RANK**8 360** of 18 124

REPUTATION**84**

AVERAGE RATING**4.80**

CONTRIBUTIONS**6** Files

DOWNLOADS **36**

ALL TIME DOWNLOADS**553**

CONTRIBUTIONS**0 Posts**

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**Content Feed**

Solved

Prime factor digits

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

5 dagar ago

Solved

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 ...

5 dagar ago

Solved

3D indexes

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

5 dagar ago

Solved

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 ...

5 dagar ago

Solved

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...

5 dagar ago

Submitted

read abaqus input file to get the nodes and elements

This readinp function can load the node and element data from abaqus inp file.

7 månader ago | 7 downloads |

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...

10 månader ago | 0

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...

10 månader ago | 0

| accepted

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'...

12 månader 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 ett år 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 ett år 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 ett år 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 ett år 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 ett år 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 ett år 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 ett år 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 ett år ago | 0

| accepted

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 ett år 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 ett år 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 ett år 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 ett år 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 ett år 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 ett år ago | 0

Solved

Calculate cosine without cos(x)

Solve cos(x). The use of the function cos() and sin() is not allowed.

ungefär ett år 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 ett år 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 ett år 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 ett år 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 ett år 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 ett år 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 ett år ago | 0

| accepted