Answered
How to solve a non-linear system of difference equations ?
Call "fsolve" repeatedly to get (S3,K2,E2), (S4,K3,E3), ... (S(t+2),K(t+1),E(t+1)) A(t) = A(1)*(1+a)^(t-1) is obvious.

7 years ago | 0

Answered
Nested loop problem with the second index
cp = zeros(length(cpx)*length(cpy),2); row = 0; for i = 1:length(cpx) for j = 1:length(cpy) row = row + 1; ...

7 years ago | 0

Answered
how to solve differential equation when the derivative is in right and left side of the equation.
MATLAB solves ODE systems of the form A(t,x)*dx = f(t,x) So put all dx terms on the left-hand side, determine the matrix A and...

7 years ago | 0

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Answered
How to plot a continuous graph from distinct points.
x=[1 3 5 6]; y=10*ones(size(x)); plot(x,y,'o')

7 years ago | 0

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Answered
Matlab code for boundary condition
So you mean at x=0, you have y = 0 and dy/dx + dz/dx at x=infinity, you have y=1 and z = b and at t = 0, you have y = 1, z...

7 years ago | 0

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How to find the X-coordinate of the plot knowing the Y-value?
[~,index] = max(max0); frequency_value = f(index)

7 years ago | 0

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Answered
pdepe solver boundary condition setup for discrete measured heat flux data
By setting pl = 0.0; ql = 1.0; qr = Area of the side face of the slab; pr = q(t); in the function where you define the boun...

7 years ago | 0

Answered
How to determine whether point lies within pyramid volume
Another program for your issue: https://de.mathworks.com/matlabcentral/fileexchange/10226-inhull

7 years ago | 0

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Complex values computed by fit.m function (Curve fitting Tool)
Since your fitting problem is linear in the coefficients a1,a2,a3,..., this is all you need to get the best fit parameters: A =...

7 years ago | 0

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Numerical integration of a function containing symbolic characters
syms A B x f = x^2*(A*x+B); result = int(f,x,0,1)

7 years ago | 0

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How do I fit a function to data using LSQNONLIN or LSQCURVEFIT?
function main tempodados = [ 0.0000755000 0.0000790000 0.0000825000 0.0000860000 0.0000895000 0.0000930000 ...

7 years ago | 0

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Help: Finds difficult in solving this coupled ordinary differential equations using ODE45 ??
Put the constants (a,b,d,..) in your first file.

7 years ago | 0

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Axial Dispersion Model, How to solve the following set of equations
Use MATLAB's "pdepe". As boundary condition for q, set pl = 0, ql = 1, pr = 0, qr = 1.

7 years ago | 0

Answered
Trouble while using fsolve function
If you have an ellipsoid given as f(x,y,z)=0 and a point P0 on the ellipsoid P0 = (x0,y0,z0), why don't you just use (df/dx(P0)...

7 years ago | 0

Answered
I know a certain y1 and I want to find the respective x1.
x1 = fzero(@(z)interp1(x,y,z)-y1,1)

7 years ago | 3

Answered
ode23 , matrix equation , 2nd order DE
Convert the system to a first order system and write it as M*y' = f(t,y) Then use the mass-matrix option of the ODE solvers to...

7 years ago | 0

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matrix vector multiplication complex number
b = [ 2 ,complex(1,-1)].' instead of b = [ 2 ,complex(1,-1)]'

7 years ago | 1

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Answered
How to tell ode15s to change its max time step for a specific short time range?
Integrate from 0 to 0.05, restart the solver and solve from 0.05-0.1, restart the solver and solve from 0.1 - 20. Every time you...

7 years ago | 1

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Answered
How can I create a handle-function with a double summation on 201 variables (40401 terms)?
FUN = @(W) (W.*sigma).'*C*(W.*sigma)

7 years ago | 0

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Answered
Efficient way to compute a double integral within a double integral
function main l1 = ...; u1 = ...; l2 = ...; u2 = ...; value_outer_integral = integral2(@fun,l1,u1,l2,u2) end ...

7 years ago | 0

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Answered
Finding point of intersection between a line and a sphere
Sphere: (x-xs)^2 + (y-ys)^2 + (z-zs)^2 = R^2 Line: [x y z] = Pm + l*normal Thus (Pm(1)+l*normal(1)-xs)^2 + (Pm(2)+l*normal(...

7 years ago | 2

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Answered
Numerical integral over the whole spherical volume of a crystallite
Nd = 1e23; phi = 20; Ld = 18e-9; R = 40e-9; fun = @(r) 4*pi*r.^2.*(1-exp(phi + 1/6*(r/Ld).^2)); value_integral = Nd*integra...

7 years ago | 1

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Answered
Numerical integration with many parameters.
function main L = 1; T = 100; r = 0.03; I1 = 0.5; p = 0.005; epsilon = 0.5; beta = 0.1; rho = 0.5; ...

7 years ago | 2

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Answered
How to write a code for a bounded periodic function?
t(1) = 0; y1(1) = 600; y2(1) = 1000; h = 0.5; t_end = 5; t = 0:h:t_end; a = 2; c = 3; alfa = 10^-3; gamma = 6*10^-3; f...

7 years ago | 1

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Answered
Probability distribution of a multiple variable sum
Take samples from your empirical data and use Monte-Carlo-simulation to determine the above probability. This code should help ...

7 years ago | 1

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Answered
How can we provide minimum distance i.e. 20 between each random generated node?
I think Jan Simon's answer will at least partially solve your problem: https://de.mathworks.com/matlabcentral/answers/142322-fi...

7 years ago | 1

Answered
Optimization problem with a function of 2 parameters
TC = @(x) (QC(x(1))+FC(x(2))+ RC)/E(x(2)); lb = [1.5e-5,1000]; ub = [2.5e-5,100000]; sol = fmincon(TC,[2e-5,10000],[],[],[],[...

7 years ago | 0

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Answered
Solve a system of equations
x22 - w0 = x13 = x31 * x32 = x22 * x21 / (x22+k2*V2) * x22 = x22 * (x22/(x22+k1*V1)) / (x22+k2*V2) * x22 This gives a quad...

7 years ago | 0

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Answered
Can anyone help me in coding matlab code for Quadratically Constrained Quadratic Program (QCQP)?
function main H = [2 0 0;0 2 0;0 0 2]; f = [-1; -2 ;-3]; R = [7 0 0;0 7 0;0 0 7]; h = [-4 ;-5 ;-6]; c = 88; ...

7 years ago | 0

Answered
Solving 2nd order ODE with ODE45
M = matlabFunction(V,'vars', {'t','Y'})

7 years ago | 2