# 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**484**

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**5** Questions

**164** Answers

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VOTES RECEIVED**37**

RANK**7,726** of 18,450

REPUTATION**105**

AVERAGE RATING**4.90**

CONTRIBUTIONS**6** Files

DOWNLOADS **37**

ALL TIME DOWNLOADS**709**

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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...

4 months 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 ...

4 months ago

Solved

3D indexes

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

4 months 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 ...

4 months 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...

4 months 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.

11 months ago | 11 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...

1 year 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...

1 year 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'...

1 year 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...

1 year 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...

1 year 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))+(...

1 year 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...

1 year 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.

1 year 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) &...

1 year 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

1 year 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...

1 year 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...

1 year 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: ...

1 year 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...

1 year 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...

1 year 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) ...

1 year 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...

1 year ago | 0

Solved

Calculate cosine without cos(x)

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

1 year 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 ...

1 year 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 = ...

1 year 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;...

1 year 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; ...

1 year 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...

1 year 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...

1 year ago | 0

| accepted