# Stephan

Knowledge means knowing where it is written... Interested in: - Optimization - Mathematical Modelling - Improvement of my programming skills

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**Content Feed**

Question

How to choose between different licenses in MATLAB Online?

Im taking part in some online courses using Matlab. For this courses there is a license for Matlab online to work through the co...

3 days ago | 2 answers | 1

### 2

answersBar plot for two matrices together

https://de.mathworks.com/help/matlab/ref/bar.html?searchHighlight=bar&s_tid=srchtitle_bar_1#bug9u7m-1 Every column stands for a...

16 days ago | 0

How to plot an oscillator?

You can plot it 2 ways - i dont know what is "correct" for your case... For me both are correct - depending on what you want to ...

22 days ago | 0

| accepted

How can I solve in the error?

%clear all, clc; % clear all memory and variables x = linspace(-1,1); % create linear spacing in x-direction y = linspace(...

1 month ago | 0

calculate and fill an area between a line and a curve

A similar discussion here: <https://de.mathworks.com/matlabcentral/answers/1870667-i-got-the-problem-with-polyshape-please-help...

2 months ago | 0

Can someone help me with the representation of the signals?

|*plot*| can not show one single point. Use at least 2 points for w to get a plot - or use |*scatter*|. w=0:10:500; To ...

2 months ago | 1

Function definitions are not permitted in this context.

https://www.mathworks.com/matlabcentral/answers/467833-error-function-definitions-are-not-permitted-in-this-context?s_tid=srchti...

2 months ago | 0

Receiving two outputs in function

To get multiple outputs from a function, you have to call it with multiple output arguments: [MY_nodeCrd,MY_edgeList]=ReadInput...

2 months ago | 1

why do I receive syms requires Symbolic math tool box

"why do I receive syms requires Symbolic math tool box?" - Simple: Because syms is part of the symbolic toolbox. If your license...

2 months ago | 1

| accepted

Answer double pendulum question usinf Rung-Kutta

Have a read here: <https://de.mathworks.com/help/symbolic/animation-and-solution-of-double-pendulum.html>

2 months ago | 0

| accepted

equation for projectile motion

This might be helpful: <https://de.mathworks.com/matlabcentral/answers/431384-write-a-script-which-will-calculate-the-trajectory...

2 months ago | 0

curve fitting using min-max optimization

You might want to start reading and trying here: <https://de.mathworks.com/help/curvefit/curvefitter-app.html>

2 months ago | 0

I got the problem with polyshape, please help me

You have to take both points into account to find a closed region: xcut1 = fzero(@(x)sqrt(x).*(12-x)./2 - 2+x, 0.5); xcut2 = f...

2 months ago | 0

| accepted

Solve non-linear systems of equations to create matrix of coeffients and solve variable

If i assume, that you have a linear system, because i think, that x1...x4 does not mean x^1...x^4 then you are nearly there: sy...

2 months ago | 0

Find light grey circle in greyscale image

Maybe this is an approach: img = imread('BinarizedImage_NewImage.JPG'); img2 = img; img2(img2<240) = 0; imshowpair(img,img2,...

2 months ago | 1

| accepted

Solving cubic equation with imaginary numbers

s1 = 133.9457 + 253.416i; s2 = 133.9457 - 253.416i; s3 = 1339.457; syms s x_exactly = solve(0.00017493*(s-s1)*(s-s2)*(s-s3...

2 months ago | 0

| accepted

combing rows into one row

I assume you want to have all values in a row vector: YouWant = reshape(MeanTemp(2:end,2:end),1,[]);

2 months ago | 0

How can I mark a region in matlab ?

x1 = 0:0.001:1; y1 = x1.^2; y2 = 1 - x1; xcut = fzero(@(x)x.^2 - 1+x, 0.5); x = [x1(x1<=xcut), x1(end)]; y = [x1(x1<=xcut)....

2 months ago | 0

| accepted

Change plot scale y axis

u21=[224 224 224 223 218 218 217]; beta1=[0 0.19 0.26 0.38 0.76 0.83 0.9]; plot(beta1,u21,'-*'); xlabel('beta') ylabel('U[V]...

2 months ago | 1

Taking derivative and putting it equal to 0 to find theta.

syms s h S(x) fun = S(x) == (6*s*h) - ((3*s*s*cot(x))/2) + ((3*s*s*sqrt(3)*csc(x))/2) sdot = diff(fun,x) == 0

2 months ago | 0

How to get the R2 value of fit?

ft = fittype('b*x^2+c*x+a'); load enso [curve, gof]=fit(month,pressure,ft,'StartPoint',[1,3,5])

2 months ago | 0

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why is my code not working?

v=[2;0;1;9;0;1;3;0;1]; m=max(v); n=mean(v); f=@(x) m-(1/2).*x; % Vectorized g=@(x) 2.*x.^2-n; % Vectorized figure ezpl...

3 months ago | 0

Finding out the minimum value position of a matrix

a=[1 2 3 4 5 10;2 3 5 6 1 12;2 6 4 5 7 16;10 2 1 4 5 20;2 3 1 4 9 12] % Here for the example row = 5, col = 1...3 ii = 5; % wa...

1 year ago | 0

Automatically fit a circle on an arc in image and to plot the circle in the image.

This example from the documentation appears to be suitable for your case.

1 year ago | 0

MaxFunctionEvaluations not working in optimset() for fsolve()

See the documentation:

1 year ago | 1

| accepted

Generation of a pair of random numbers satisfying a constraint

N = 10; r = sort(rand(N,2),2)

1 year ago | 0

| accepted

Dimensions of arrays being concatenated are not consistent.

clc; clear all; close all; %% Parametri %% Inercija; {kg.m2} Juc = 2.6e-2; Jlc = 1e-3; %% Kruto...

1 year ago | 0

| accepted

How can I vectorize the fun in Matlab with single code

Possible, but not recommended: https://de.mathworks.com/help/matlab/ref/vectorize.html

1 year ago | 0

functions within the script

a1=myfunction(5) a2=myfunction(7) function a=myfunction(r) a=10*r end

1 year ago | 1

| accepted