Answered
Regarding choosing correct boundary condition
If you set qL = 1 and qr = 1 and you defined f as f = D*du/dx in the function where you need to specify [c,f,s], you can specify...

2 years ago | 0

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Answered
How to interpolate 2-parameter dependents matrices?
Use griddedInterpolant or scatteredInterpolant on each matrix element separately depending on whether the point pairs (Vi,qj) fo...

2 years ago | 1

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Answered
Mathematical Equations to MATLAB
%Parameters beta = 2; alpha = 200; Ccl = 2000; Cpm = 2500; Rl = 1100; Cren = 50000; delta = 0.223; P = 12; N = 8; Clo...

2 years ago | 0

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Answered
How can I replace NaN in a table with a zero?
https://uk.mathworks.com/matlabcentral/answers/231096-replace-nan-s-in-table-with-zero

2 years ago | 0

Answered
ODE15i DAE Warning:Failure at t=0.000000e+00. Unable to meet integration tolerances without reducing the step size below the smallest value allowed (0.000000e+00) at time t.
It can be deduced from your equations that the only possible solution for your DAE system is y(i) = 0 for i=1,...,8. Thus you c...

2 years ago | 0

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Answered
Solver Stop Prematurely as new equation added
Use an options structure for "fsolve" as options = optimset('MaxFunEvals',100000,'MaxIter',100000) sol = fsolve(...,options) ...

2 years ago | 1

Answered
Please tell me what corrections can I make when encountering the following error?
We don't know the contents and sizes of the arrays you use. So we are unable to help. This would work e.g. : xspan = linspace(...

2 years ago | 0

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Can I solve more than two PDEs in 2D?
If you have a licence for the PDE Toolbox, you can apply it to solve your problem.

2 years ago | 0

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Answered
Iteration method of optimization
That's what I get from your description. But I might have misunderstood something. % Parameters m_values = linspace(0, 1, 100)...

2 years ago | 0

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Answered
Error using surf (line 71) Z must be a matrix, not a scalar or vector.
Before your loop insert the commands size(squeeze(ws(:,:,1))') size(we_m) size(sn_m) For surf to work, all sizes must be the...

2 years ago | 0

Answered
Unknown variables appearing in solutions for symbolic equation solver
syms x f = x^5+x^4+3*x^2-4; solve(f==0) vpa(solve(f==0)) double(solve(f==0)) I have no explanation for the u that appears i...

2 years ago | 0

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Answered
¿Por que me aparece el error de Incorrect number or types of inputs or outputs for function applyBoundaryCondition en mi codigo?
Instead of "edges", you have to include the edge number to which you want to apply the boundary condition. I plotted the geomet...

2 years ago | 0

Answered
Fitting multiple curves with multiple data sets, partial and globally shared parameters using lsqcurvefit
rng("default") b1 = 1; b2 = 0.85; b3 = 2.5; b4 = 1.1; b5 = 2.2; b6 = 4.5; b7 = 1.3; b8 = 7.2; b9 = 9.5; b10 = 0.5; %x data ...

2 years ago | 0

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Answered
Why is this matlab program not able to solve accurately?
Some equations cannot be solved analytically because they are too complicated or because there are no functions available that c...

2 years ago | 1

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Answered
I want to perform this time derivative?
From your description, you have 412 different dV_c/dt curves over time, one curve for each distance X. And now ? Do you want to...

2 years ago | 0

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Answered
NLP problem with fmincon: Non-differentiable point in objective function
The solution variables for "fmincon" must be continuous in order to compute gradients, Hessians etc. Therefore, the solver is no...

2 years ago | 0

Answered
solving nonlinear wave equation
Using the method of characteristics, you get the equations dt/ds = 1 dx/ds = v_max*(1-2*rho/rho_max) drho/ds = 0 You should ...

2 years ago | 2

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Answered
Is it possible to create a distribution fit (preferably gaussian mixture distribution model) for a distribution with precalculated bincounts?
The bincounts define a probability distribution. Draw random numbers from this distribution - they can be used as data in "fitdi...

2 years ago | 0

Answered
How can i solve this eqaution in matlab?
I still don't understand where you can change t=0.1 s, t=20 s, t=60 s, but here we go: Rho_f = 920; %kg/m^3 Dp = 0.152; % m m...

2 years ago | 0

Answered
How can i solve this eqaution in matlab?
Rho_f = 920; %kg/m^3 Dp = 0.152; % m m_dot_oxi = 7.95; %kg/s n = 0.75; m = -0.15; a = 2.006e-5; Rp = Dp/2; % m A = pi*(Rp...

2 years ago | 0

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Answered
Finding accurate inverse of binary circulant matrix
BCM=readmatrix('MixingLayer.xlsx'); inv(gf(BCM,2))

2 years ago | 0

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Answered
finding value in 2d array function of x and y
Given (vehicle.wheeltorque ,vehicle.wheelspeed), use pdist2 to compute the distances to the column vectors of the matrix [Torque...

2 years ago | 0

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How do I sort these 2D-Points to get a proper surf plot of this function
x = linspace(-1,1,1000); y = linspace(-1,1,1000); [X,Y] = meshgrid(x,y); Z = nan(size(X)); idx = X.^2+Y.^2 <= 1; Z(idx) = 1...

2 years ago | 1

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Answered
how to read mat file in matlab
https://uk.mathworks.com/help/matlab/ref/load.html

2 years ago | 0

Answered
Proving one function is greater than other?
syms x y f = 53.989/21.233 * (log(log(x))).^(4/3)./(log(x)).^(1/3); %x is solution where f starts getting greater than 1 xsta...

2 years ago | 0

Answered
Multicomponent gas separation in hollow fiber membranes
par.thickness_membrane = 1e-6; % thickness membrane [m] par.Perm_H2 = 250*3.35e-16; % Permeability H2 [mol m/m2 s Pa] par.Per...

2 years ago | 0

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Answered
How should I set the value of u_tau?
The problem simply is that you cannot solve delay PDEs with "pdepe", at least not directly. A possible remedy: Call "pdepe" in...

2 years ago | 0

Answered
Calculate the summation of second column in both arrays
array = [2 5;7 -4]; sum(array(:,2))

2 years ago | 0

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Answered
Function with multiple input parameters to be determined through fitting
You have to use "integral" instead of "int" and loop over the elements in E_p: EM_SS([1 1 1 1 1 1],1) function F = EM_SS(p, e_...

2 years ago | 0

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Answered
How to solve a system of nonlinear differential equation that follows some pattern
function dy = fun(t,y) dy = y.*[y(2:end);y(1)] end or a function handle fun = @(t,y) y.*[y(2:end);y(1)]

2 years ago | 1