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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) = ((...

12 mesi fa | 0

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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-...

12 mesi fa | 0

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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 ...

12 mesi fa | 0

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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...

12 mesi fa | 0

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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...

12 mesi fa | 1

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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...

12 mesi fa | 0

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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...

12 mesi fa | 0

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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...

circa un anno fa | 0

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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, ...

circa un anno fa | 0

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

circa un anno fa | 0

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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")

circa un anno fa | 0

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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...

circa un anno fa | 0

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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...

circa un anno fa | 0

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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...

circa un anno fa | 0

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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...

circa un anno fa | 1

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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...

circa un anno fa | 0

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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...

circa un anno fa | 0

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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...

circa un anno fa | 0

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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); ...

circa un anno fa | 0

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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...

circa un anno fa | 0

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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...

circa un anno fa | 0

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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 ...

circa un anno fa | 1

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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 ...

circa un anno fa | 0

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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...

circa un anno fa | 0

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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...

circa un anno fa | 0

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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 ...

circa un anno fa | 1

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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...

circa un anno fa | 0

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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...

circa un anno fa | 0

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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...

circa un anno fa | 1

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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....

circa un anno fa | 0