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Quadratic assignment problem in matlab
https://de.mathworks.com/matlabcentral/fileexchange/53110-quadratic-assignment-problem-qap-using-ga-pso-and-fa

casi 4 años hace | 0

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Optimization - non-linear eqn. genetic algorithm
Your problem is linear - thus use linprog instead of ga: f = -[ 1 1 1 1]; A = [0.8 0.2 0 0;0 0 0.45 0.55;-0.8 -0.2 -0.45 -0.55...

casi 4 años hace | 0

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How to explain a difference in solutions of integrals between MATLAB and MAPLE?
https://www.wolframalpha.com/input?i=integration&assumption=%7B%22C%22%2C+%22integration%22%7D+-%3E+%7B%22Calculator%22%7D&assum...

casi 4 años hace | 0

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Maximize Linear Programming using linprog Problem is unbounded?
For M >= 4, choose x1 = 0, x2 = M/2 , x3 = M Then x = [x1,x2,x3] is feasible and the value of the objective is 3/2*M which can...

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how do I index within symfun matrix?
syms f(x) [1 2] f f(1) Therefore what it created was a single function that has an array result. f(1) is interpreted as apply...

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ODE45 Multiple Degrees of Freedom Problem
% This script produces a transient response of a 3DOF dynamic model of a % jacket platform clear all clc % Define global var...

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How to solve this multi equation using matlab program
According to your y-vector, you want to have -2*p1 + 2*p2 = 0 -1*p2 + 1*p3 = 0 3/2*p1+3/2*p2-3*p3 = 0 Insert p1 = p2 = p3 ...

casi 4 años hace | 0

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finding equation of motion using lagranges function
syms th thd g m l k L = m*l^2*thd^2/2 + m*g*l*cos(th); X = {th thd}; Q_i = {0}; Q_e = {0}; R = k*thd^2/2; par = {g m ...

casi 4 años hace | 0

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How to model 3 Degrees of Freedom at once
Define a solution vector y = (y1,y2,y3,y4,y5,y6) with y1 = y_a, y2 = y_a_dot, y3 = z_a, y4 = z_a_dot, y5 = Theta_a, y6 = Theta...

casi 4 años hace | 0

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I want to plot selected data from rows and columns
Plotting the second against the first column does not make much sense because the first column is the year and the second column...

casi 4 años hace | 0

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Python 3.11 Compatibility with MATLAB
https://de.mathworks.com/support/requirements/python-compatibility.html

casi 4 años hace | 1

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I need help integrating this function
The first argument to "integral" has to be a function or a function handle. Both does not seem to be the case in the call Q_tot...

casi 4 años hace | 0

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How can i apply a value to a symbol given a solution to a system of equations.
syms h C3 C4 C5 eqn1 = h == C3 + C4 + C5; eqn2 = 0 == 3*C3 + 4*C4 + 5*C5; eqn3 = 0 == 6*C3 + 12*C4 + 20*C5; [C3 C4 C5] = s...

casi 4 años hace | 0

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solve a linear system of equations with several unknown parameters
You have 8 equations for 6 unknowns. The consequence in general is that there is no solution that satisfies the 8 equations exac...

casi 4 años hace | 1

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what is wrong with this code?
Most probably, you will have to change all / and * and ^ to ./ and .* and .^ in your code (elementwise operations instead of mat...

casi 4 años hace | 0

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Integral of a Matrix Issue
Why do you name the same radius R in the denominator R_T ? Both are equal to the cylinder radius (in your case 15, I guess). r=...

casi 4 años hace | 0

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How do I solve this set of equations using MATLAB?
As you can see from the below analysis, there is only the solution n_1 = n_2 = n_3 = 0 without conditions on the angles th1, th2...

casi 4 años hace | 0

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Including changing variable in ODE
If you want to make alpha dependent on Ts, either use a function handle alpha = @(t,Ts) something or make two vectors of Ts an...

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How do I solve this set of equations using MATLAB?
You want to solve for one unknown - thus you only need one of the two equations. If you want to solve for n1, n2 and n3, you ha...

casi 4 años hace | 0

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what is mean by this?
p1 is a vector. Thus with the expression SNR_N1(i) = h1*sqrt(p1)/sigma(i) you try to assign a vector (right-hand side) to a ...

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Matlab alternatives for gradient optimisation problems?
If it fits your needs: this code would run under Octave. %pkg load symbolic syms x1 x2 f = (x1-1)^2+(x2-x1^2)^2; H = hessian...

casi 4 años hace | 1

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how derive a solution of ode45
The red curve is the derivative of the blue curve. syms y(t) [V] = odeToVectorField(diff(y, 2) + 2*diff(y) - sin(y) == 0) M =...

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Using Newton's method for 2 equations for finding concentration at different points
Why don't you use "fsolve" ? Don't you have a license for the optimization toolbox ? I don't understand J, f1 and f2 in your co...

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Ode15s and function containing system of odes
I suggest you start with a simpler example at the beginning than your complicated system of 3 transient PDEs 2D in space. Someth...

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How to do partial derivates?
syms x y f = x*sin(x*y); dxy = diff(diff(f,x),y) dyx = diff(diff(f,y),x) By the way: it's called "partial derivatives", not ...

casi 4 años hace | 0

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Unable to plot 3D graph
Doesn't look very impressive, does it ? A = readmatrix("https://de.mathworks.com/matlabcentral/answers/uploaded_files/1184273/2...

casi 4 años hace | 0

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pyrun！How do I keep more decimals?
You keep all decimals in both cases - only the output format is different. format long pyrun("x1=0.24236152","x1")

casi 4 años hace | 1

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How to add a constant value above a matrix in following code?
P = [0.25*ones(20,106);P;0.21*ones(20,106)]

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Convert Array of symbolic expression to array of symbolic function handle
You mean syms x f = [x^2;x^3]; f1 = matlabFunction(f(1)) f2 = matlabFunction(f(2))

casi 4 años hace | 0

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Numerical differential equation solver for initial conditions not at y0
The solution seems to be very sensitive to the initial condition. syms Uf(t) delta y d = 0.2000; k_Karman = 0.4; sol_Um = 3....

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