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constrained optimization with Matlab, symbolic function
If your function f is symbolic, you first have to convert it to a numerical function by using "matlabFunction". k_tot = ...; a...

12 jours il y a | 0

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I am unable to find the minimum value of function f in this optimization problem. The solver always returns 0 for all variables which is not possible. I am unable to correct.
The solution is correct: A*x <= b is satisfied, and since all elements in the f-vector are positive, 0 is optimal. Maybe you wa...

12 jours il y a | 0

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int function is not working properly in matlab
Evaluate gamma(n_star_D3(i)+l_d+1) gamma(n_star_D3(i)-l_d) and you will see the reason. Consequently, Gff_D3(i)...

13 jours il y a | 0

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Negative sign produced by "functionalDerivative" - why?
As you can see here at the bottom of the page https://uk.mathworks.com/help/symbolic/sym.functionalderivative.html functionalD...

13 jours il y a | 0

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Cost of buy with price 26 is 2*26 + c = 152 in your setting. Note that although you don't generate energy, Cg_i(0,a,b,c) = c - t...

14 jours il y a | 1

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Why the results of three codes with the same expression and method are different ?
Integrate equation (1) from x = 0 to x = x, and the problem will become much easier. dvdx0ini = 1; St = [0.1,0.5,1]; hold on ...

15 jours il y a | 0

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Curve fitting and parameter estimation with lsqcurvefit
% Load data data = readtable('infections.csv'); dates = datetime(data.Date, 'InputFormat', 'dd-MMM-yy'); cases = data.Cases; ...

16 jours il y a | 0

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How to set lower bound lb as a function of optimization variable.
Use function "nonlcon" to define nonlinear equality and inequality constraints. If v(i) depends linearly on the solution variab...

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When using 'quadprog' how do I limit certain solutions so that they can only become whole numbers?

17 jours il y a | 0

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Synthax for equation in script
r0 = 3; r1 = 4; delta = linspace(-r0,r0,31).'; k = linspace(-r1,r1,31).'; 0.5*sqrt((delta+k.^2).^2+4*k.^2)

17 jours il y a | 0

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Equal arc discretization method code
warning("off") syms t t1 t2 % Parameters R2 = 12; %outer radius (between this radius and R1 is constant arc increment) b = 2...

17 jours il y a | 0

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A quatity is being solved by a self consistent integration
format long syms x A = 2000; a = 500; b = 1000; Z = 0; for i=1:20 f = x^4*((A^2+Z^2)/(A^2+4*(x^2+a^2)))^4 / (sqrt(x^2+...

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How can I write the term \sum_{q=1}^{m} b_{pq}(t)g_q(y_q(t-\tau_{q}(t))) to produce the same graph
I don't know exactly what you are asking for, but if it's about solving Equation 1, you will have to use a solver for delay diff...

18 jours il y a | 0

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Non linear fitting with 3 independent variables
M = load("Data.mat"); fun = @(A,B,C,E)(A - B*M.IL - C*M.a).*exp(-E*M.Vf); f = @(A,B,C,E) fun(A,B,C,E) - M.K; A0 = 13.5*13.2; ...

18 jours il y a | 1

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Finite Difference Method - Central Difference Method for Groundwater Flow Problem
It would help if you included the mathematical description of your problem in order to compare with your coding (equation(s) to ...

18 jours il y a | 0

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How to return a vector output when a vector input is given to a function_handle representing a constant function?
This works in both cases: % Usual Case syms x; syms t; u = symfun(x^2,x); u_x = diff(u,x); u_x = matlabFunction(u_x); u_...

19 jours il y a | 0

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Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.
Only a single number can be saved in an array element. But you try to save a vector ([a b(i) c 0 0 0 0 0 d(i)]) in a single e...

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Runge Kutta 4th Order Method for an Equation
Write a function function dy = f(t,y) that accepts t and a vector y of length 2*n with y = [c_1;...;c_n,cbar_1;...;cbar_n] ...

20 jours il y a | 1

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How can I calculate the integral of Legendre function P(n,theta) ?
The Legendre function is a numerical, not a symbolic function in MATLAB. Further, it's define for -1 < x < 1. So integration f...

21 jours il y a | 1

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Plotting discrete Klein - Gordon equation (DKG) with friction in DNA
acceleration(1) = acceleration(numBases) = 0 for every value of i in your loop. From the equation initialVelocities = initia...

21 jours il y a | 0

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Trying to solve system of PDE by spacial discretization. Errors are coming frequent . what am i doing wrong ?
Technically, your code works now. But you get NaN values for some dydt's. The reason might be that you start with a complete 0 v...

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I need help with an error I get
Define F before you call "funcao_forca". It's not set in your code. Maybe you mean F = funcao_forca(t,f); because f is a give...

21 jours il y a | 1

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Error in untitled22>solveHeatEquation1D (line 32) U(N+2,n+1) = beta(t); Error in untitled22 (line 11) [t, x, U] = solveHeatEquation1D(T, a, b,mu, u0,alpha, N, M);
a = 0; b = 1; % spatial interval T = 0.4; % end time mu = 0.5; % conductivity alpha = 1; ...

22 jours il y a | 0

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Why does the code always return "-ve" values?
When I run the main, it returns me all negative values though I have given only two negative values. Why not ? The objective is...

22 jours il y a | 0

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gradient descent optimization doesnt work in code?
My guess is that either "Energyconsumption" depends discontinuously on waypointTimes, that epsilon in the compuation of the grad...

22 jours il y a | 0

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Do you need to initiate symbolic variables in a script if you will be calling for a function using those symbolic variables?
You need to define all variables in the calling program that are not being explicitly passed from the function, but that you hav...

22 jours il y a | 0

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Vector with symbolic variable
Works for me. psi = sym('psi',[8 1]); t = 1:1000; psi(t(5))

22 jours il y a | 0

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4.2 Whiteboard Coordinate System Error for Function
This arithmetic operation is not defined in MATLAB: 2\*pi

23 jours il y a | 1

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Error: File: untitled5 Line: 19 Column: 1 Function definitions in a script must appear at the end of the file. Move all statements after the "f" function definition to before
Your interval of integration is complex-valued. I used nested functions to make the parameter g visible in your "f". And I ass...

23 jours il y a | 0

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Error using fmincon and integral2: taking integral variables theta and p as an array while performing computation
Take care that you pass k, c and d1 as values, not as function handles to your objective function. Thus (as in all your questio...

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