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**Feeds**

having if/else statement go to previous input

r = rand(); if opt == 1 || (opt == 3 && r < 0.5) abc else xyz end

1 dag ago | 0

6x6 system of multivariate quadratic equations ... non-negative real solutions

I think there is no specialized solver for a system of quadratic equations. Thus a general nonlinear solver ("fsolve","lsqnonlin...

1 dag ago | 0

| accepted

Color Burr distribution function line

pd = makedist('Burr','alpha',1,'c',2,'k',5); R = random(pd,100,1); pd = fitdist(R,'Burr'); figure(1) plot(pd) x = 0:0.01:2;...

1 dag ago | 0

| accepted

Writing ODE equations for ode45 to solve;

The form of the equations that can be solved by ode45 is M*y'(t) = f(t,y). So you can decide whether you choose M to be the iden...

3 dagen ago | 0

| accepted

How to use a solver to get the terminal velocity of a sphere.

v0 = fsolve(@fun,1) function res = fun(v0) d_p =...; rho_air = ...; nu_air = ...; rho_w = ...; g = ...; Re ...

4 dagen ago | 1

| accepted

Nusselt number and skin friction for bvp4c

Nu1 = -(1+bk*(1+m))*S1.y(5,1) Nu2 = -(1+bk)*S1.y(5,end) Tau1 = (1-bv*(1+m))*S1.y(4,1) Tau2 = (1-bv)*S1.y(4,end)

4 dagen ago | 0

| accepted

K Nested For Loops for arbitrary K

I'd generate all possible k-tuples out of the n numbers and throw away those that are not monotonic by using the "diff" command:...

5 dagen ago | 0

How to find non-zero solutions to underdetermined systems of equations

The null() function gives you a basis for ker(A): A=[0.719600000000000,0.069400000000000,0.526400000000000,0.110700000000000;1....

8 dagen ago | 0

| accepted

How to get the exact step size used by ode45?

If the stepsize is part of the ODE equation, you cannot use ODE45 to solve. You have to write your own integrator.

10 dagen ago | 0

| accepted

Optimization Eigenvalue problem Stiffness matrix

Should be % Perform optimization [K_opt_vec,~,res] = lsqnonlin(@(K) obj_function_reshaped_matrix(K, M, f_exact_Hz), [k1_guess,...

11 dagen ago | 0

MATLAb Solve function not solving

Which MATLAB version are you using ? R2024b gives a direct answer: clear all close all syms I1 I2 V0 s=2; eqns=[5*I1+4*...

12 dagen ago | 1

How to find the equation of a 2D plane that best fits a set of vectors defined in n dimensions?

https://stackoverflow.com/questions/48200261/fit-plane-to-n-dimensional-points-in-matlab

12 dagen ago | 1

How to obtain direct symbolic solutions without introducing intermediate variables like z and z1 in MATLAB's solve function?

If it can't, I want to see what is the z and z1 in the solution. k,l,x,z and z1 are arbitrary numbers that satisfy joint_soluti...

12 dagen ago | 0

| accepted

How to Set a Minimum Step Size for Variables in GA Solver (Global Optimization Toolbox)?

Define 21 integer variables x_i that can take values 0 or 1 (by using the "intcon" input to "ga" and setting the lower and upper...

16 dagen ago | 0

Trying to create a polynomial using data from a table

You can't expect exact agreement, but the approximation is not that bad (at least for the point chosen): % Data preparation dP...

19 dagen ago | 0

Algebraic variable derivatives in the DAE solution process

0 = dg/dx * x' + dg/dy * y' + dg/du * u' = dg/dx * f + dg/dy * y' + dg/du * u' Solve for y'.

21 dagen ago | 0

System of state dependent delay equations causes ddesd to run forever.

y(5) is negative shortly after t = 0. Thus your delay d = t - y(5) in principle would refer to values of y(1) that are not yet k...

23 dagen ago | 0

Integrating multivariate Gaussian pdf in 4 dimensions

Use "mvncdf": https://uk.mathworks.com/help/stats/mvncdf.html If your function is more complicated than posted, try "integralN...

23 dagen ago | 0

| accepted

The mean function isn't working and i don't know why

Check whether the data type of Data_IV_KE is "double". To this end, MATLAB should return "double" when you type class(Data_IV...

26 dagen ago | 0

Solving Second-Order BVP with unknown Constants using fsolve

solinit = bvpinit(linspace(-6.17415,6.17415,64),[0;0],[.809827,0]); sol = bvp4c(@mat4ode,@mat4bc, solinit); xint = linspace(...

26 dagen ago | 0

| accepted

Hi,I tray RUN this code but i get tis error ( below the code)

Variables and/or functions are missing to run your code. According to the error message, m90_plot is an array of size 12784, bu...

27 dagen ago | 0

expressing the complex function

Use syms x t real instead of syms x t Then real(series) and imag(series) will work.

29 dagen ago | 0

| accepted

beginner integration trouble.

"int" cannot find an analytical antiderivative for f(x). Thus to get the numerical value for the integral, use Area=2*vpainte...

29 dagen ago | 0

| accepted

How to loop through values?

Beta = linspace(0,1,10); Alpha = linspace(0,2,20); n = numel(Beta); m = numel(Alpha); Result = zeros(n,m); for i = 1:n ...

29 dagen ago | 0

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Using erfcinv and array indices are being rejected as not positive or valid, despite all being positive in the vector

As far as I understand, "erfbatp" is an array of numbers. So erfbatp(2*.05/2) = erfbatp(0.05) does not make sense, does it ? V...

ongeveer een maand ago | 0

Converting symbolic ODE solution to function ... Warnings

The solution is implicitly given by the equation (a*y+b*y^2/2+c*y^3/3+d*y^4/4)-(a*y0+b*y0^2/2+c*y0^3/3+d*y0^4/4) - integral_{x'...

ongeveer een maand ago | 0

convert the above expression into this graph

I'll show you how to solve for theta2 given theta from the equation sin(theta2-theta)+exp(-theta2/(omega*tau))*sin(theta)=0 F...

ongeveer een maand ago | 1

| accepted

Trouble using ODE45 for coupled non-linear differential equation

I can't recover the four differential equations you solve from the two equations you included in mathematical form. Your equati...

ongeveer een maand ago | 0

How to get the answer from the following code. How can i extract the values from the code?

F = U1.y(5,1)-Nt*U1.yp(5,1) J = -1i*U1.y(6,1) N1 = -U1.y(7,1) N2 = -U1.y(8,1)

ongeveer een maand ago | 0

| accepted