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select and extract only some coordinates of a 3D object

Is this what you are asking? % your code rabbit = importdata("rabbit.txt"); figure plot3(rabbit(:,1), rabbit(:,2), rabbit(:,...

ungefär en månad ago | 0

| accepted

Convert these lines to Curves

You can interpolate your data using interp1. Warning: the interpolation may be not accurate for your trend, in this case is on...

ungefär en månad ago | 0

Numerical integration "backwards" for ODE45

you may be interested to read the comments to this post https://www.mathworks.com/matlabcentral/answers/4592-numerical-integrat...

ungefär en månad ago | 1

How to evaluate integral from 0 to inf of besselj(0,kr) * besselj(0,kR) * 1/k * (2 - e^-kz - ek(z-L)) dk

For the numerical integration, you can use integral, that also accepts Inf as integration upper bound clear variables, close al...

ungefär en månad ago | 1

| accepted

Contourf and Surf with repeated values

Suppose you have Nx divisions along the variable of the first column and Ny divisions along the variable of the second column. Y...

ungefär 2 månader ago | 0

| accepted

I want to write a script that reads an input text file that specifies the parameters and then uses them to solve an integral

As suggested by @Torsten your problem is a system of first order ODEs and you must use a ODE integrator. Try this clear variabl...

ungefär 2 månader ago | 1

| accepted

Define Integral in Matlab

Suppose to have these data The simulink model is calulating you can calulate the integral in the discrete form with cumtra...

ungefär 2 månader ago | 0

How to plot faster instead of for loop?

Try using cellfun clear variables, close all load data.mat % index to [0 0; 0 0] matrices index1 = cellfun(@(x) isequal(...

ungefär 2 månader ago | 0

| accepted

How to draw an Elliptical Arc by given radius (rx and ry) and start/end points ?

I am a little lazy to do the math, so I have found this reference for the two parameters a and b that describe an ellipse. http...

ungefär 2 månader ago | 0

| accepted

How to plot with bar3 plot in MATLAB?

Check the code below, Hope it helps clear variables, close all B = [86, 82, 80]; B2 = [91, 88, 85]; B3 = [98, 95, 89]; ...

3 månader ago | 1

| accepted

How to reduce the size of legend in a fig file?

You can try playing with the 'location' optional input, for example using legend('blabla1','blabla2','Location','bestoutside') ...

3 månader ago | 0

Convert german numbers from excel to matlab (change comma versus point)

You may try to use readtable to import your data. It reads excel files and has the option 'DecimalSeparator' that can be set to ...

4 månader ago | 1

| accepted

Create multiple copies of one file in multiple directories with different names

Try this. Note: the file A.txt must be in the current folder % data N = 10; dirName = 'Folder'; fileName = 'A'; % loop ...

4 månader ago | 0

| accepted

How to rotating a stl object

You shoud translate the points p before the rotation and then move them back If R is your rotation matrix and the center of rot...

4 månader ago | 0

| accepted

Very tricky:Manipulation with complex array

Following @Paul suggestion % original vector X = [4, 1, 1, 3, 8, 12]; % reshape to have 2xN vector W = reshape(X,2,[]); ...

4 månader ago | 0

| accepted

Minimal-code to get axes limits of log-log plots, but using gscatter

You can remove the negative part of the axis before setting the log scale set(gca,'XLim',[0 max(xlim)],'YLim',[0 max(ylim)]); ...

8 månader ago | 0

How to plot Temperature vs Efficiency curve using For loop and Linspace?

I have commented your plots to avoid moltiple figures % numebr of temperatures nT = 100; % temperature vector T = linspace(2...

8 månader ago | 1

| accepted

Question

Calculation of consistent initial conditions for ODE

(minor edit) Hi everyone, I have written wrapper functions calling MATLAB's ODE solvers. Specifically, my problems are DAEs wi...

8 månader ago | 1 answer | 0

### 1

answerHow to find same unique in two different size arrays?

Use ismember % data x=[1 22 22 3 8 19]; y=[22 10 19 35]; % engine [iii,jjj] = ismember(y(:),x(:)); countCommon = su...

8 månader ago | 0

| accepted

Having trouble using for loops to create a matrix

I reproduce the result of the picture, because the question is not clear. a = 25 ; b = 5 ; c = (2*a)/b - 1 ; % do not use mi...

8 månader ago | 0

| accepted

How to plot a function

You may use fplot figure, hold on fplot(@(x)x.^-3,[1 1e5]) fplot(@(x)x.^-2.8,[1 1e5]) % use bi-logaritmic scale set(gca,'...

8 månader ago | 0

Ax = 0 with 2 values of x known

The post is old but the question arises many times, so I post here my solution. It is a generalization of @Matt J solution. Sup...

9 månader ago | 0

Looking for visualization method to present finite difference numerical solution in 2D

You may use the low-level patch function. Since I don't have your data, please find below a self-consistent example showing the ...

11 månader ago | 0

smooth step function with rise time

My colleague Sofia have found a paper [1] where authors report the analytic approximation of the piece-wise linear step function...

mer än ett år ago | 1

| accepted

Question

smooth step function with rise time

Hi everyone, I know this question is more related to math than Matlab, but I know there are many gurus out there who can easily...

mer än ett år ago | 3 answers | 1

### 3

answersHow can I calculate the sum of the absolute error?

Please check the code below. clear all, close all % model F = @(c,x)c(1)+c(2)*x+c(3)*(x.^2-1); % data xk = [-2 -1 0 1 ...

mer än ett år ago | 1

| accepted

Drawing a rotating circle on a sphere

The code should be self-explicative [X,Y,Z] = sphere; % figure figure, hold on axis equal, view([1 1 1]); % sphere wit...

mer än ett år ago | 0

| accepted

How can you solve a system of second order differential equation, which is not time, but length and radius dependent?

This is not an ODE but a PDE. you should have a look at pdepe

mer än ett år ago | 2

| accepted