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Anyone who can help on the bvp4c code?
Reducing the Deborah number gives smooth results. I guess 1-De*max(f)^2 (i.e. the factor in front of f''') should remain posit...
10 Tage vor | 0
| akzeptiert
persistent variable from previous run is not deleted during a new run of my .m file
Using two .m-files instead of only one script seems to solve the problem according to https://uk.mathworks.com/matlabcentral/an...
11 Tage vor | 0
Implicit finite difference scheme in MATLAB for 1D Mobile-Immobile Model (MIM) with linear sorption and degradation
Substitute the right-hand side of the equation for the Immobile Region for the expression theta_im*R_im*dC_im/dt in the equation...
12 Tage vor | 0
Anyone with an idea on how can we make the plotting style of the bvp4c and the SRM method to be the same?
Write two functions sisko_bvp4c and sisko_SRM - thus one for bvp4c and one for your spectral relaxation method - that accept L, ...
14 Tage vor | 0
| akzeptiert
How can we make the following spectral relaxation code to run?
Here is a code for the Blasius equation to give you an idea: N = 100; L = 10; % % Solve Blasius equation f''' + 0.5*f*f'' ...
15 Tage vor | 0
How can we make the following spectral relaxation code to run?
I modified A1, B1, A2, B1 and A3 to get compatible dimensions for matrix multiplications without knowing whether these modificat...
17 Tage vor | 0
input freqRange in bandpower doc example returning an error when it is a Mx2 matrix
The specification of "freqRange" as Mx2 matrix was introduced in R2026a. Do you use this MATLAB version already ? Alternatively...
18 Tage vor | 0
| akzeptiert
textscatter example, and behavior, is mysterious
Most probably, text is set where possible and the rest positions are marked by blue points. The following example seems to sup...
21 Tage vor | 1
Why is Preallocating arrays important in MATLAB, and how does it improve performance compared to dynamically growing arrays?
That's what AI answers: Preallocation in MATLAB—creating an array to its full size before filling it within a loop—is significa...
22 Tage vor | 0
can this code be improved?
Better use separate functions for problem setup, ODE solution and plotting and call these three functions from one main driver. ...
25 Tage vor | 0
Finding all eigen value between two given eigen value.
There is no special feature in "eig" or "eigs" to find all eigenvalues within a specified range. The best you can do is to use "...
26 Tage vor | 0
Can anyone help on the plotting of the Skin friction coefficient , Nusselt number and the Sherwood number on bvp4c?
If Skin friction coefficient = Cfx*0.5*Re^(1/(n+1)), Nusselt Number = Nux*Re^(-1/(n+1)) and Sherwood number = Shx*Re^(-1/(n+1))...
27 Tage vor | 0
Good day my good people, how can we plot the classical variables and the main equations under variation of parameters in bvp4c?
To compute the "classical" variables Cx, Nux and Shx, we need Reb. To vary parameters, use a loop. E.g. sisko5() function sis...
29 Tage vor | 0
| akzeptiert
In optimization toolbox, fmincon implemented both IPM and SQP. There are many versions of IPM and SQP. Can you please explain which IPM and SQP algorithms are implemented?
Description of the algorithms used / General and specific references to literature: https://uk.mathworks.com/help/optim/ug/cons...
etwa ein Monat vor | 0
| akzeptiert
How to use the nonlinear least square fitting to fit a transfer function？How to improve the fitting accuracy
Replace [cof,resnorm,residuals,exitflag,output] = ... lsqcurvefit(@OBJrealimag,T0,2*pi*ft,ydata2); by options = optimset...
etwa ein Monat vor | 1
How do I set up these three water application events in MATLAB and incorporate them into the boundary conditions?
The usual way to discretize the diffusion equation du/dt = d/dz (D(u)*du/dz) for a given flux q = -D*du/dz at z = z_0 on a gri...
etwa ein Monat vor | 0
Kinks/discontinuities in pdepe solution
Are you sure you want to solve your problem in cylindrical coordinates (since you set m = 1 in the call to "pdepe") ? Tighten y...
etwa 2 Monate vor | 1
| akzeptiert
obtain an equation for the curve joining maximum points, using an appropriate interpolation or “curve fitting” process???
Follow @Matt J 's advice and maximize y=v0*sin(angle_rad)*t - 0.5*g*t.^2 over t for a given angle "angle_rad". For comparison: ...
etwa 2 Monate vor | 0
How do I solve coupled PDEs and ODEs together using pdepe?
The usual setting in this case is c = 1 f = 0 s = according to your ODE pl = 0 pr = 0 ql = 1 qr = 1 for the ODEs. This...
etwa 2 Monate vor | 0
| akzeptiert
What are possible causes of "Unable to meet integration tolerances without reducing the step size below the smallest value allowed" when calling ode15s() from Simulink?
What are possible causes of "Unable to meet integration tolerances without reducing the step size below the smallest value all...
etwa 2 Monate vor | 0
Confidence interval in fit
Call "confint" (for the parameters) or "predint" (for the fit) from the command line with the wanted confidence level: https://...
etwa 2 Monate vor | 1
| akzeptiert
what's wrong with matlab dsolve ?
If a > 0, insert C1 = const + log(a) in MATLAB's solution for the free constant C1, and you will recover your solution. For a ...
etwa 2 Monate vor | 0
Curve fitting confidence intervals - discrepancy in manual CI plot and predint plot
Did you read https://uk.mathworks.com/help/curvefit/confidence-and-prediction-bounds.html ? The formulae to compute the diffe...
etwa 2 Monate vor | 1
How do I find if a point is within the volume of a rotated ellipsoid
Apply the "anti-rotation" of the ellipsoid to the point P=(x,y,z) and check whether the image P'=(x',y',z') you receive lies in ...
2 Monate vor | 1
| akzeptiert
In my code, I am getting plot on lambda=1, but rest plots are not reflecting. Please help to get all figures.
The results for the last 3 values of lambda are NaN (see above) - thus they are not plotted.
3 Monate vor | 0
| akzeptiert
Wanting all results for an algebraic equation that is within a function .
One method: Define the algebraic variables as additional solution variables to the ODE system. This results in a DAE-system (i....
3 Monate vor | 0
Simulating a system of damped PDEs with the Matlab PDE toolbox.
Did you try to set the problem as u1_dot = u3 u3_dot = delta(u1) + J1 u2_dot = u4 u4_dot = -u4 + delta(u2) +J2 ?
3 Monate vor | 1
pdepe fails to solve PDEs with absorbing boundaries
This is what I get from AI when I type in your error message: This error occurs because a third-party package (usually MatCont)...
3 Monate vor | 0
| akzeptiert
different in Poisson distribution test
"kstest" is not applicable since the Poisson Distribution is a discrete, not a continuous distribution. Since the example "Test...
3 Monate vor | 1
| akzeptiert
Find all roots of a transcendental equation
Quite a hack and no guarantee that you will find all roots in the specified region, but I think there is no better method for th...
3 Monate vor | 0
| akzeptiert
