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- Mathematical Modelling

- Improvement of my programming skills

Answered

Solving a symbolic system of equations

Try: % Equillateral Strain Rosette Problem % angle values (A = 0, B = 120; C =60; seems to be standard for a 60 degree % eq...

Solving a symbolic system of equations

Try: % Equillateral Strain Rosette Problem % angle values (A = 0, B = 120; C =60; seems to be standard for a 60 degree % eq...

14 hours ago | 1

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Answered

Why should I use the zeros function?

It is for performance reasons: https://de.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html

Why should I use the zeros function?

It is for performance reasons: https://de.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html

2 days ago | 1

Answered

Input arguments error on line 2

Divide your code into a function for your ode and the part for solving and plottting the results: y0 = 0; % --> change to 1 for...

Input arguments error on line 2

Divide your code into a function for your ode and the part for solving and plottting the results: y0 = 0; % --> change to 1 for...

2 days ago | 0

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Answered

what is wrong?

Typo - it is cos instead of cox, and the usage of '.*' elementwise multiplication x=-3:0.1:3 y=sin(x).*cos(2*x)+1 plot(x,y)

what is wrong?

Typo - it is cos instead of cox, and the usage of '.*' elementwise multiplication x=-3:0.1:3 y=sin(x).*cos(2*x)+1 plot(x,y)

3 days ago | 0

Answered

Asking for help with syntax for fmincon

The solvers in Matlab accept only one vector as variable. So change y(1) --> x(3) and y(2) --> x(4). Then edit the code this way...

Asking for help with syntax for fmincon

The solvers in Matlab accept only one vector as variable. So change y(1) --> x(3) and y(2) --> x(4). Then edit the code this way...

3 days ago | 0

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Answered

Calculate the population mean of several probability distributions

Du kannst das direkt in der Schleife machen, in dem Du die benötigten Felder der struct ansprichst und die interessierenden Wert...

Calculate the population mean of several probability distributions

Du kannst das direkt in der Schleife machen, in dem Du die benötigten Felder der struct ansprichst und die interessierenden Wert...

3 days ago | 0

Answered

Subscript in figure WHAT AM I DOING WRONG?

<https://de.mathworks.com/matlabcentral/answers/157122-latex-interpreter-mean-bar-with-subscripts>

Subscript in figure WHAT AM I DOING WRONG?

<https://de.mathworks.com/matlabcentral/answers/157122-latex-interpreter-mean-bar-with-subscripts>

3 days ago | 0

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Answered

How get the Adjacency matrix from complete graph

Its trivial: A = ones(n) - diag(diag(ones(n))) or, more easy A = ones(n) - eye(n)

How get the Adjacency matrix from complete graph

Its trivial: A = ones(n) - diag(diag(ones(n))) or, more easy A = ones(n) - eye(n)

4 days ago | 0

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Answered

basic error, help me

2 closing brackets missing, one '*' operator missing, one times use './' instead of '/': x = linspace(20,100000); y = 20*log1...

basic error, help me

2 closing brackets missing, one '*' operator missing, one times use './' instead of '/': x = linspace(20,100000); y = 20*log1...

4 days ago | 0

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Answered

Splitting an array up

use this before reshaping - it discards all data, you dont care about: x = x(:,1:40*2048)

Splitting an array up

use this before reshaping - it discards all data, you dont care about: x = x(:,1:40*2048)

5 days ago | 0

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Answered

How do I simplify the values of a function?

Can be done with symbolic toolbox - matlabFunction returns an anonymous function the way you want: syms x % known constants a...

How do I simplify the values of a function?

Can be done with symbolic toolbox - matlabFunction returns an anonymous function the way you want: syms x % known constants a...

5 days ago | 0

Answered

how can I write more than 1 objective in linprog line

You can not do this in linprog. See here instead: https://de.mathworks.com/help/optim/multiobjective-optimization.html If you ...

how can I write more than 1 objective in linprog line

You can not do this in linprog. See here instead: https://de.mathworks.com/help/optim/multiobjective-optimization.html If you ...

5 days ago | 0

Answered

How to permute binary numbers to a specific permutation

https://de.mathworks.com/help/matlab/ref/circshift.html F=[0 6 2 5 4 3 6 1]' A = dec2bin(F) B = circshift(A,1,2) gives: F =...

How to permute binary numbers to a specific permutation

https://de.mathworks.com/help/matlab/ref/circshift.html F=[0 6 2 5 4 3 6 1]' A = dec2bin(F) B = circshift(A,1,2) gives: F =...

6 days ago | 0

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Answered

I need help fixing an error that pops up when running my code. "Undefined function or variable 't'.

Seee the code below: % [Car B] is traveling a distance d ahead of [Car A]. Both cars are traveling % at the same initial veloc...

I need help fixing an error that pops up when running my code. "Undefined function or variable 't'.

Seee the code below: % [Car B] is traveling a distance d ahead of [Car A]. Both cars are traveling % at the same initial veloc...

6 days ago | 0

Answered

How to Create an Anonymous Function?

Try to write it in one line - i guess you use an older release of Matlab, that does not support the semicolon operator in a seco...

How to Create an Anonymous Function?

Try to write it in one line - i guess you use an older release of Matlab, that does not support the semicolon operator in a seco...

6 days ago | 0

Answered

Solving nonlinear second order diferential equation

%% Dados iniciais clear Massa_foguete_seco = 3000; % Kg Massa_combustivel_inicial = 3000; % kg Empuxo ...

Solving nonlinear second order diferential equation

%% Dados iniciais clear Massa_foguete_seco = 3000; % Kg Massa_combustivel_inicial = 3000; % kg Empuxo ...

8 days ago | 0

Answered

2D Histogram aus 2 Matrizen

Immer dann, wenn in A oder B eine 0 vorkommt, wird g_a oder eben g_b gleich Null. Wenn dann im nächsen Schritt versucht wird, H_...

2D Histogram aus 2 Matrizen

Immer dann, wenn in A oder B eine 0 vorkommt, wird g_a oder eben g_b gleich Null. Wenn dann im nächsen Schritt versucht wird, H_...

9 days ago | 0

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Answered

population size of pso in matlab

You find it here: https://de.mathworks.com/help/gads/particleswarm.html?s_tid=srchtitle#budidgf-options The entry is in the th...

population size of pso in matlab

You find it here: https://de.mathworks.com/help/gads/particleswarm.html?s_tid=srchtitle#budidgf-options The entry is in the th...

9 days ago | 0

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Answered

Storing values in a matrix

% Constants m=15; l=2; g=9.81; d=l/2; Io=(1/3)*m*(l^2); wn=sqrt((m*g*d)/Io); % function handle for linearized ode Vib_...

Storing values in a matrix

% Constants m=15; l=2; g=9.81; d=l/2; Io=(1/3)*m*(l^2); wn=sqrt((m*g*d)/Io); % function handle for linearized ode Vib_...

9 days ago | 0

Answered

ODE solvers - passing parameters

<https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html>

ODE solvers - passing parameters

<https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html>

1 month ago | 0

Answered

Matlab code for solving the following system equation

>> A = [2 1 5; 2 2 3; 1 3 3] A = 2 1 5 2 2 3 1 3 3 >> b = [5; 7; 6] b = ...

Matlab code for solving the following system equation

>> A = [2 1 5; 2 2 3; 1 3 3] A = 2 1 5 2 2 3 1 3 3 >> b = [5; 7; 6] b = ...

1 month ago | 0

Answered

How to solve a LPP when the A of linprog does not form a square matrix? I have 5 variables and 2 constraints.

% define all constraints A = [2, 2, 2, 0.6, 0.3; 0 0.04, 0.08, 0.09, 0.135; -eye(5)] b = [750, 30.75, zeros(1,5)] ...

How to solve a LPP when the A of linprog does not form a square matrix? I have 5 variables and 2 constraints.

% define all constraints A = [2, 2, 2, 0.6, 0.3; 0 0.04, 0.08, 0.09, 0.135; -eye(5)] b = [750, 30.75, zeros(1,5)] ...

1 month ago | 0

Answered

How to multiply three scalar value one by one to other five scalar value and get all the results in Simulink

[1 2 3] .* [3 5 7 9]'

How to multiply three scalar value one by one to other five scalar value and get all the results in Simulink

[1 2 3] .* [3 5 7 9]'

1 month ago | 0

Answered

Solving Integral via MATLAB!!

syms a b z eq = (a-z) / ((1+z)*(b+z)); pretty(eq) sol = int(eq,z); pretty(sol)

Solving Integral via MATLAB!!

syms a b z eq = (a-z) / ((1+z)*(b+z)); pretty(eq) sol = int(eq,z); pretty(sol)

2 months ago | 0

Answered

I can not plot values

syms Frx B m V1 V2 P1g P2g Frz alfa1 A1 V M Degree Fr W Weight m1=18;B1=1;P1g=0;V1=250;A1=1;alfa1=0; m2=m1;B2=B1;P2g=0;V2=250;...

I can not plot values

syms Frx B m V1 V2 P1g P2g Frz alfa1 A1 V M Degree Fr W Weight m1=18;B1=1;P1g=0;V1=250;A1=1;alfa1=0; m2=m1;B2=B1;P2g=0;V2=250;...

2 months ago | 0

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Answered

Reinforcement Learning toolbox step function

The action the agent has choosen in the last step, usually has an impact on the environment. To let the step function know what ...

Reinforcement Learning toolbox step function

The action the agent has choosen in the last step, usually has an impact on the environment. To let the step function know what ...

2 months ago | 0

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Answered

Why is this break not executing for the summation of pi

You never reach the value of your ratio of PrevSum/pie. I inserted 2 lines, the first saves the ratio in every single run of you...

Why is this break not executing for the summation of pi

You never reach the value of your ratio of PrevSum/pie. I inserted 2 lines, the first saves the ratio in every single run of you...

2 months ago | 0