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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...

2 years ago | 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...

2 years ago | 0

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

2 years ago | 0

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

2 years ago | 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...

2 years ago | 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...

2 years ago | 0

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Answered
Create "n" non-lineal equations in a loop and solved by Fsolve
n=; pi=; p0=; pn=; Ag=; k1=; k2=; k3=; k4=; factor=(p0-pn)/n; for i=1:n-1 x0(i)=p0-factor*i; end x0(n)=0; ...

2 years ago | 0

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Answered
Boundary conditions in pdepe for 1D parabolic velocity profile
The problem set up below is rho*cp*u_z*dT/dz = 1/r * d/dr (r*k*dT/dr) + Q T(z=0,r) = -40 dT/dr = 0 at r = 0 -k*dT/dr = h*(T-...

2 years ago | 0

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Error using fmincon and integral: taking integral variable as an array while performing computation
[q] = optimizeParameters();% Call optimizeParameters to define the objective function q options = optimset('PlotFcns', @optimpl...

2 years ago | 0

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Answered
Using Computational Fluid Dynamics CFD in Matlab
Are you sure that these problems are really meant to be solved with "full CFD" ? MATLAB does not have a CFD tool - you will hav...

2 years ago | 1

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Three y axis with one x axis
https://uk.mathworks.com/matlabcentral/answers/459385-multiple-y-axes-on-single-x-axis

2 years ago | 0

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Can not solve system of differential equations with ode45 taking into account continuity equation
Where do you specify the equations for p1L and p1R ? In your vector of time derivatives [dPdt(t, y(3)); dCdt1(t, y(4), y(1)); ...

2 years ago | 0

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Error: using fmincon: FMINCON requires all values returned by functions to be of data type double.
As you can see above, your function returns a symbolic NaN, but it must return a numerical defined value. To change the output ...

2 years ago | 0

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Answered
Difficulties with symbolically integrating Paris law equation
% Numerically DEL_SIG = 180e6; a = 0.1e-3; ac = 28.6e-3; A = 4e-13; expression = @(x)1./(A*DEL_SIG^4*pi^2*x.^2); N = inte...

2 years ago | 0

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Answered
triple nested integral with error "Arrays have incompatible sizes for this operation."
Please supply an executable code in order to test your code and reproduce the error. Usually, adding 'ArrayValued',true as an o...

2 years ago | 0

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Nested integrals spends quiet different time to calculate for different input values
Check whether the computations are reliable because of the big span of integration. mu1 = 100; sigma1 = 10; mu2 = 200; sigm...

2 years ago | 0

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Could anyone help me with my matlab bvp4c program?
The order of your functions in the dydy function handle is wrong. It should work now. %I am a Researcher, my problem is i t...

2 years ago | 1

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Answered
How can I find the troughs of something without using the function findpeaks?
Use the "diff" function on the array "flow". A peak occurs between flow(i) and flow(i+2) if diff(i) > 0, but diff(i+1) < 0 (m...

2 years ago | 0

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Error Using Optimization with Integer Variables and Non-linear Constraints
Replace norm_h=optimvar('norm_h','Type','integer'); prob = optimproblem('ObjectiveSense','minimize'); prob.Constraints.cons1 ...

2 years ago | 0

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A naive question regarding MATLABs definition of parabolic/elliptical PDEs (pdepe)
https://en.wikipedia.org/wiki/Elliptic_partial_differential_equation Second-order linear partial differential equations (PDEs) ...

2 years ago | 0

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Answered
How to find the point that resides on a contour that is closest to a known point?
format long Z = peaks(50)/10; surf(Z) obj = @(x,y)(x-16.35)^2+(y-0.05)^2; nonlcon = @(z)deal([],interp2(0:49,0:49,Z,z(1),z(2...

2 years ago | 1

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The standard implementation of ldl factorization in Matlab does not work correctly
From the documentation: [L,D] = ldl(A) factorizes full matrix A into a permuted lower triangular matrix L and a block ...

2 years ago | 0

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How to optimize the run time in my optimization problem.
I don't see anything obviously wrong in your coding - except for the last term in MTE_i which should be (TotalProduct(6)-Exper...

2 years ago | 0

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I'm getting the 'Not enough input arguments' error event though I am pretty sure I am giving all the arguments needed at all times
format long [x,it] = NewtonSystemSolver(5, 10^-12, 100, [5e4,0,0,0,5e4].', @Slammer1, @Slammer1Jacobian) Slammer1(x) function...

2 years ago | 1

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Answered
ode15s giving integration tolerance error and loop stopping at zeroth iteration
The evaluation of the variable "ros" for your vector of initial conditions y0est gives NaN. The reason is that you start with mL...

2 years ago | 0

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Multiple iterations for plotting
Maybe you mean h= 0.5; b = 0.5; d1= 0.474; d2= 0.035; As= 2512*10^-6; Asc= 2512*10^-6; fy= 400*10^6; Es= 200*10^9; fc...

2 years ago | 0

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Answered
There is a matrix operation, A*B=c. would there be a way to find a specific elemetn in C and call out variables that were involved in the calculation of the specific element
Since you set C = A.*B and not C = A*B, the elements that influence the value at position (i,j) in C are the elements (i,j) in A...

2 years ago | 0

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Set up a gradient descent algorithm for a multivariable economic dispatch problem
There must be something wrong in the computation of t in your code. For t=1, the usual gradient descent works: clc; clear; sym...

2 years ago | 0

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Answered
Setting Boundary Conditions & Using bvp4c
xcastle = 20; % x-coordinate of target v0 = 20; % Prescribed (...

2 years ago | 0

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Answered
Solving ODE system with a constraint/boundary condition
p_A + p_B should remain constant since dp_A/dz + dp_B/dz = 0 according to your equations. But this is not the case for p_A + p_...

2 years ago | 0