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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...
environ 21 heures il y a | 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. ...
4 jours il y a | 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 "...
5 jours il y a | 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))...
6 jours il y a | 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...
8 jours il y a | 0
| A accepté
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...
18 jours il y a | 0
| A accepté
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...
19 jours il y a | 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...
22 jours il y a | 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...
24 jours il y a | 1
| A accepté
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: ...
25 jours il y a | 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...
26 jours il y a | 0
| A accepté
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...
environ un mois il y a | 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://...
environ un mois il y a | 1
| A accepté
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 ...
environ un mois il y a | 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...
environ un mois il y a | 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 ...
environ 2 mois il y a | 1
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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.
2 mois il y a | 0
| A accepté
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....
2 mois il y a | 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 ?
2 mois il y a | 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)...
2 mois il y a | 0
| A accepté
different in Poisson distribution test
"kstest" is not applicable since the Poisson Distribution is a discrete, not a continuous distribution. Since the example "Test...
2 mois il y a | 1
| A accepté
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 mois il y a | 0
| A accepté
How to use the "Use weights for each response" option on simbiology model analyzer on a Fit program?
Did you study the example "Use Group-Specific Dosing Data for Parameter Estimation with Numeric Weights" under https://uk.mat...
3 mois il y a | 0
| A accepté
Saving a matrix with a variable that could take any value
Either define the matrix as a function handle SM = @(L)[12/L^3 6/L^2 -12/L^3 6/L^2; 4/L -6/L^2 2/L 6/L^2; ...
3 mois il y a | 1
| A accepté
Save variable number in matrix for later iteration
Maybe like this ? I'm not sure whether you want to take the elements of C and J according to the order of the elements in I or...
3 mois il y a | 1
| A accepté
How to solve dy/dt=A(t)*y where y is a vector (3 elements) and A is 3x3 matrix with time dependent elements.
The code should somehow look like: Y0 = [1;0;0]; tspan = [0 1]; v1 = ...; % your first vector v1 needed to compute A v2 = ....
3 mois il y a | 0
Please help me to run this simple code
Your solution for rr(3) becomes complex-valued. For complex-valued functions, you can plot e.g. their real part, their imagina...
3 mois il y a | 0
How do I add summation to a symbolic equation in order to integrate across set bounds?
Use logncdf: https://uk.mathworks.com/help/stats/logncdf.html Use to compute f_act with the help of "logncdf" and use the ...
3 mois il y a | 1
| A accepté
Implicit expansion with arrayfun (cpu vs gpu)
F3 = cellfun(@myadd, [{x}], [{y}], 'UniformOutput', false) will work. Arrayfun tries to apply "myadd" to [first element of x,f...
3 mois il y a | 1
Inverse Problem, I have unknowns to solve it
L and N cannot be estimated separately. As long as phi is a single scalar value , L*phi + N must be treated as only one parame...
4 mois il y a | 0
| A accepté
