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**Feeds**

Plotting a variable versus space and time

Use "slice": https://uk.mathworks.com/help/matlab/ref/slice.html

ongeveer een uur ago | 0

checkGradients, but the objective function has two inputs: x and xdata?

valid = checkGradients(@(p)semiCircle(p, Q),p0)

ongeveer 2 uur ago | 0

| accepted

How can I evaluate the transition matrix using the fourth order Runge-Kutta ODEs

Seems to work. What's your problem ? Don't use the transition matrix to integrate in one pass. If you have to, generate it with...

ongeveer 15 uur ago | 0

getting singular jacobian error while using bvp4c solver

I can't interprete your solution curves, but it seems to be a problem for the solver that the Scaled Mass goes to 0 with increas...

2 dagen ago | 0

Empty sym: 0-by-1 : Don't understand why

I multiplied by the denominators and squared to get rid of the square roots. Your system seems to have 4 (complex-valued) solut...

3 dagen ago | 0

| accepted

Non-linear least squares estimation with linear constraints in Simulink?

I vaguely remember that using "lsqcurvefit" within Simulink requires to use the Levenberg-Marquardt algorithm. I can't answer wh...

3 dagen ago | 1

Do I have a convergence issue?

B0 = 0.5; B = fsolve(@fun,B0) function residual = fun(B) g = 10; %m/s^2 Q = 70*1000; %N/m tau_L1 = 24*1000; %Pa t_w = 30...

3 dagen ago | 0

HOw to find displacement integrating velocity?

The equation from above describes the stationary velocity profile over the length L. Thus replacing v by dx/dt does not make sen...

4 dagen ago | 1

| accepted

Integration symbiolic form in matlab gives error

I think you will have big problems if you try to integrate a function with values in the order of +/- 1e70. syms r theta Part_...

7 dagen ago | 0

Why the symbolic method fail when I tried to expand a ellipse

I get the correct result (at least for coe = [1;1;1;1;1;1]) : aex = expandA(ones(6,1)).' function aex = expandA(coe) A = co...

8 dagen ago | 0

Why did i receive error with my for loop ode45 function?

I used numerical values for L1, L2, mblade, kt and Jblade right from the beginning and got expressions for dL_dtheta2_numeric an...

10 dagen ago | 0

Why do i get the error (Array indices must be positive integers or logical values) when trying to calculate the determinant

I don't get any error. But you shouldn't overwrite the function "det" by using the variable name "det" for the result. Name it ...

11 dagen ago | 0

having if/else statement go to previous input

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

13 dagen 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...

13 dagen ago | 0

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;...

13 dagen 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...

15 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 ...

16 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)

16 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:...

17 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....

20 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.

22 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,...

23 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*...

24 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

24 dagen ago | 1

| accepted

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...

24 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...

28 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...

ongeveer een maand 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'.

ongeveer een maand 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...

ongeveer een maand ago | 0