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Help with Difference Equation in MATLAB
If V_i, h_i, C, K and theta_0 and theta_1 are given, you can solve for theta_(i+1) and compute theta in a loop. theta(i+1) = ((...

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Integrations of Bessel functions
For the first integral I_1, see https://math.stackexchange.com/questions/393399/integral-of-product-of-bessel-functions-of-the-...

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Solving linear system of equations
I think you mean %Parâmetros x=0; del=0; al1=0.707; oc=0.3; Gamma1=1; Gamma3=1; g1=1/100; %Matriz a ser diagonalizada ...

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Calculate eigenfunctions to known eigenvalues
https://en.wikipedia.org/wiki/Inverse_iteration You could also try null(A-lambda*eye(size(A))) where lambda is a given eigenv...

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Deactivate trial toolbox and reactivate on another machine?
This is AI's answer under "Google": To use a MATLAB toolbox trial on a new computer, you'll need to deactivate the trial on th...

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TCC Connection design matrix
You can code it with V and C being sparse. For simplicity, I used full matrices. n = 50; V = zeros(n); s = zeros(n,1); V(1,1...

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Unexpected results using SVD to separate components that make up a function
Others have already explained why you cannot recover p1, p2 and p3 from an SVD of p = p1 + p2 + p3. All you can do is write p...

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How can i get to get this curve in red when the vector is moving? The curve results from the displacement of the tip of the vector
% Définir les vecteurs de la base O (i, j, k) i = [1; 0; 0]; % Vecteur i j = [0; 1; 0]; % Vecteur j k = [0; 0; 1]; % V...

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Error plotting orbits figure
Seems that most of the missing functions are available under http://www.rotordynamics.info/ (Software for Lateral Vibrations, ...

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Counting the number of increments in a vector
x = 0:0.1:7; numel(x(x<=3))

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Get mean of a matrix which has NaN in it
grades = [2,4,6; 5, NaN, 1; 7, 2,NaN] mean(grades,1,"omitnan")

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Resonance in moonpool type structures
I'd change k(n) = lsqnonlin(fun_alpha, guess, x0_left, x0_right); to k(n) = lsqnonlin(fun_alpha, guess, x0_left, x0_right,op...

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Incorrect results for subtraction despite working for other use cases.
"segments_of_free_space" and "focal_lengths" (or "f" and "gaps") must have the same number of elements because you reference gap...

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MATLAB Onramp: Help with Plots
The problem seems to be known: https://uk.mathworks.com/matlabcentral/answers/2178891-why-does-my-answer-to-a-task-show-up-as-i...

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Help with Solving PDE System with DAE in MATLAB
You have discretized your equations in space. Thus the y variables are only functions of time for fixed z-coordinates. Here is...

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Solving DE initial value problem symbolically in Matlab
By default, y is assumed a function of t: syms x y(t) sol(t) = dsolve('x*Dy+y=-sin(x)','y(pi/2)=0') simplify(x*diff(sol,t)+so...

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How to iteratively solve when equations are dependent on each other.
Sigma_ysrtM = load("Sigma_ysrtM.mat").Sigma_ysrtM; T_oQlast = load("T_oQlast.mat").T_oQ; K_dot_nom = load("K_dot_nom.mat").K_d...

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dispersion equation in water waves
I solve in y = x*h. Thus the result has to be divided by h to get x. k(j,n) = fzero(@(y)fun_alpha(y,omega(j)),y0_alpha)/h; The...

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Difference between integral and cumtrapz.
Your input arguments to "cumtrapz" are reversed: you have to use intfx = cumtrapz(x,fx); instead of intfx = cumtrapz(fx,x); ...

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Please 🙏 help me to find the exact solution of ODE
I doubt you can get an analytical expression for y. All you can do is to transform your 2nd order ODE into a system of first-ord...

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Storing value in a matrix from a for loop.
Don't use "size" as a variable name - it's a MATLAB - reserved function: https://uk.mathworks.com/help/matlab/ref/double.size.h...

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How to store a matrix so that I can call upon it in any other file I am working in?
Declare the matrix as "global" or pass it as input argument to all functions where it is needed. Or save it as a .mat-file and ...

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Gaps in contour plot using custom secant method (when solving for two-plume merger)
The equation for rho is a polynomial of degree 4. The MATLAB function "roots" solves for the four zeros of this equation. I ...

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May I ask everyone to help me solve this problem
I'm not sure, but if you want to integrate the normal distribution, use "mvncdf". integral2 can be very inaccurate when integrat...

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Clustering using Gower's Distance
To use a distance that is not implemented, you have to define a function handle. Since I guess that GowerDst is not a function h...

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Why do I get the wrong values for enthalpy on the P-h diagram block in Simulink/Simscape?
The reference enthalpy for R-134a is often given for the saturated liquid at -40°C, with a value of 148.4 kJ/kg. If you look at ...

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Problems plotting an implicit solution to a differential equation
For more complicated cases where an explicit solution cannot be found: syms y(x) eqn = diff(y) == (2*x+y+2)/(2*x+y-4); soluti...

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fft function seemingly not evaluating correctly
syms x f = 1/(2*sym(pi))*exp(-0.5*x^2); fourier(f) The Gaussian Pulse example under https://uk.mathworks.com/help/matlab/ref...

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mvncdf seems to be violating the additive property of integrals
The complete IR^2 is made up of four quarter zones, not two. Sketch the quarter zones over which you integrate to understand wha...

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how to evaluate the integral of the expression involving bessel functions.
l = 0; R_I = 2; N = 3; P = 3; k = [0.28,0.2,0.1,0.05]; %[k0,k1,k2,k3] e = [0.3,0.9,0.7]; %[e1,e2,e3] d = [0.1,0....

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