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Trouble with fmincon - minimizing a vector
The appropriate objective is to minimize -sum(similiarityvalues.^2)

más de 2 años hace | 1

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Get solution for a linked multi-stage BVP
How do I model this problem? By solving it as a multipoint boundary value problem: https://uk.mathworks.com/help/matlab/math/s...

más de 2 años hace | 0

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Boundary Value Problem based on specific problem
x(0) = 0 gives C1 = 0, x'(0) = 0 gives C2 = 0. Thus the solution of your equation is x = 0 for all t.

más de 2 años hace | 1

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odeToVectorField takes forever to run
Are you sure you want to differentiate with respect to functions of t (like theta1, theta1_dot, theta2_dot) ? drn1 = diff(r1,th...

más de 2 años hace | 0

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Solve second-order ODE with Robin boundary condition
syms x y(x) A B C a b dy = diff(y,x); eqn = diff(x^2*dy,x)-2*y == 0; cond1 = A*dy(a)+B*y(a)/a == 0; cond2 = A*dy(b)+B*y(b)/b...

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I want to solve the Lyapunov equation with matlab
Use MATLAB's "lyap" or "dlyap".

más de 2 años hace | 0

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Is matlab able to solve a system of coupled PDE and ODE?
Setting c = 0 in "pdefun" deletes the time derivative of the respective equation and makes the equation an elliptic one. But y...

más de 2 años hace | 0

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graph is the not plotted as desired because of tolerance level
dydx(5) = (-t4./(1-1i.*H1)).*y(4); instead of dydx(5) = (-t4./(1-1i.*H1)).*y(3); in your function definition. I didn't look...

más de 2 años hace | 0

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Having trouble with lsqcurvefit for a heat transfer experiment.
The calls to lsqcurvefit must be h_freebrass = lsqcurvefit(T_free_brass2,10,x,T_free_brass) h_freecopper = lsqcurvefit(T_free_...

más de 2 años hace | 0

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Error using pdepe Unexpected output of PDEFUN. For this problem PDEFUN must return three column vectors of length 2
The size of "f" is 4x1 instead of 2x1 (see above). Further, if your x-mesg starts at r=0 and you choose m=2, it must hold that ...

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How can I plot a graph by varying two parameters a and b in system of ODE at the same time?
A = [1;2;3]; B = [2;3;4]; C = 10000; d = 2; e = 5; g = 1; tspan = [0 5]; for i = 1:numel(A) a = A(i); b = B(i);...

más de 2 años hace | 1

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How to find same values in a randi function
Hand = randi(13,[1,5]) arrayfun(@(i)nnz(Hand==i),1:13)

más de 2 años hace | 0

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how can I calculate my expression with double integration?
Maybe you mean this, but I'm not sure: D = 100; e_f = 1.88e-18; m = 9.11e-31; k_b = 1.38e-23; h_bar = 1.05e-34; ksi = 1e-9...

más de 2 años hace | 0

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I need to solve a system composed by four coupled equations: three ODE and one algebric non-linear equation.
You can try a differential-algebraic solver like ode15s that accepts a mixture of differential and algebraic equations by defini...

más de 2 años hace | 0

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fsolve with bound constraints - transformation method
Transformation and initial values are two independent problems that both have to be solved. You cannot compensate "bad" initial ...

más de 2 años hace | 0

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implicit numerical method: 1-D unsteady state heat transfer using finite difference method
pde() function pde() % Constants Ly = 0.0015; % Total thickness of the system (meters) T = 40; % Total s...

más de 2 años hace | 1

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Interpolating data to get values at specific depth
Make X and Y also 224x164x37 (just by repeating the planar profile 37 times) and use interp3 to interpolate to the depth of your...

más de 2 años hace | 2

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How can I find the vector that simultaneously maximizes my two functions?
Usually, you can't find a vector that maximizes both of your functions simultaneously. You can compute the pareto-front for your...

más de 2 años hace | 1

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Solving nonlinear system of PDE by using finite difference method for spatial and RK4 for time derivative?
You need two boundary conditions for Tap, one boundary condition for Tsg and one boundary condition for Tag. Your equation for ...

más de 2 años hace | 1

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PDE solve with bvp4c
Take a look here on how boundary value problems with two regions (in your case -1 to 0 and 0 to 1) have to be set up for bvp4c: ...

más de 2 años hace | 0

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Solve a system of nonlinear differential equations
Define the unknown functions as y(1) = F, y(2) = dF/dx, y(3) = G, y(4) = dG/dx, y(5) = H. Then the equations are dy(1)/dx = y(...

más de 2 años hace | 1

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I need some help to solve non-linear equation with three unknowns and three knowns with having 170 different values for one known.
M = [eta+1,Rz,-Ry;-Rz,eta+1,Rx;Ry,-Rx,eta+1]; M = repmat(M,170,1); b = []; for i = 1:170 b = [b;Xw(i)-Tx;Yw(i)-Ty;Zw(i)-Tz...

más de 2 años hace | 0

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How can I skip the rest of an if statement?
Also in for-loops, "break" only exits the inner structure, but the outer loop runs until the end (see below). Thus you cannot ...

más de 2 años hace | 0

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Error using vertcat Dimensions of arrays being concatenated are not consistent..
Most probably: second_derivative = diff([0, diff(Ida_normalized(i:window_end))]); instead of second_derivative = diff([0; dif...

más de 2 años hace | 1

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Surface plot doesn't correspond to optimization solution
The problem is now, when I select a point randomly in the surface plot, and then calibrate the model for these values, I do not ...

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Solving an equation with symbolic matrix
https://uk.mathworks.com/matlabcentral/answers/1918100-error-using-solve-with-symmatrix-equation

más de 2 años hace | 1

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A group of 12 people all roll a pair of dice 12 times, how often does each person roll a total number that is greater than or equal to 7?
In my opinion, it should be roll1=randi(6,12); roll2=randi(6,12); total=roll1+roll2; GT7 = total>=7; totalGT7 = sum(GT7,1);...

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error in for loop
u(j-3) is only defined for j>=4, u(j+3) is only defined for j<=length(R)-3. Similar restrictions hold for the other indices. Thu...

más de 2 años hace | 0

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I'm suppose to plot the response of the system but i'm getting wrong values
alpha is a constant , and this is the value of it , I doubt that the rate of change at t=0 for x(5) should be 2.55e17 as you g...

más de 2 años hace | 0

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How can I multiply a row vector with each of two column vectors?
t = [1 2]; s = [(1:3)',(4:6)']; kron(t,s)

más de 2 años hace | 3