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transformPointsForward does not support PolynomialTransformation2D
Polynomial tforms are generally not invertible, so you can only define them in one direction. I assume fitgeotform2d always fits...

23 days 前 | 0

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已回答
FGETL taking a long time to execute
readlines?

23 days 前 | 0

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How to view a 3D Figure from "below", e.g. z-axis facing downwards
Set the CameraUpVector axis property. figure plot3(0,0,0) line([0 0.1],[0 0],[0 0],'LineWidth',5,'DisplayName','X') line([0 ...

23 days 前 | 1

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已回答
Convert Set of (x,y) Coordinates Into Polygon
This uses tspsearch from the File Exchange, https://www.mathworks.com/matlabcentral/fileexchange/71226-tspsearch load coordina...

24 days 前 | 0

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Using drawpoint in 3d axes
Another approach is to make a custom app, with controls for the position of the electron. ...

28 days 前 | 0

已回答
Using drawpoint in 3d axes
You cannot place a 3D point using a drawing object that has only 2 degrees of freedom. Probably the better approach is to use th...

29 days 前 | 0

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How do I set up fmincon correctly for parallel computation? "Supplied objective function must return a scalar value"
I want to parallelize the computation, either by calculating several gradients at the same time, or solve the problem for severa...

1 month 前 | 0

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Multiobjective optimization with polygon boundary
Use vert2lcon to find the inequalities for the constrained region, https://www.mathworks.com/matlabcentral/fileexchange/30892-a...

1 month 前 | 1

已回答
Custom loss function (based on error multiplication rather than sum) in classification neural network
Using trainnet you can provide any loss function you wish. However, a multiplicative loss function sounds like a doubtful idea. ...

1 month 前 | 0

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Vectorizing 2D DFT for only select region of the output
Ex=subDFTmatrix(kx_vals,Nx); Ey=subDFTmatrix(ky_vals,Ny); F_partial = Ey*image*Ex.'; function E=subDFTmatrix(k,N) E...

1 month 前 | 0

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Where I make a mistake with fminimax?
Some ideas, The choice of initial guess p0=[1,1,1,1,1] looks arbitrary. I don't see why that would be a good guess. You should...

1 month 前 | 1

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How to get a dlgradient result for a blackbox function
radon() can be expressed as a matrix multiplication, and matrix multiplications are of course supported by dlarrays. One option ...

1 month 前 | 1

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Does gather() clear memory
It seems to for me: >> A=gpuArray.rand(300,300,300); >> gpuDevice().AvailableMemory ans = 3.1956e+09 >> A=gather...

1 month 前 | 0

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How to use validation dataset in iteration-based deep network training?
Sure, use the network to make some predictions, https://www.mathworks.com/help/deeplearning/ref/dlnetwork.predict.html

1 month 前 | 0

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What are the differences between fitrnet and trainnet?
Unlike fitnrnet, the L-BFGS algorithm used by trainnet does not seem to use a line search. That might have had something to do w...

1 month 前 | 0

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A simple question regarding image processing
I see that some pixels are darker than others, but no pixels that are jet black. If you have some criterion to decide which pixe...

1 month 前 | 0

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define an objective function with user defined number of variables in fminunc()
The only way fminunc knows the number of variables is by looking at numel(x0) where x0 is the initial guess: xmin = fminunc(fun...

1 month 前 | 2

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Deconvolution of two different Gaussians
If you know a priori that all the signals are Gaussians, then deconvolution would not be the best way to recover espread. You kn...

1 month 前 | 0

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已回答
Displaying a struct containing gpuArray fields takes an extremely long time in R2024b
Here's a possible workaround: c.a=1; c.b=2; c.data=gpuArray.rand(100,100,100,'double'); tic; c, toc c = struct with...

1 month 前 | 0

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Finding a circle in a 2D array
load P BW=median(P(:))-P>50; BW=bwpropfilt(bwareaopen(BW,100),'Eccentricity',6,'small'); c=vertcat(regionprops(BW,'Cent...

1 month 前 | 1

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已回答
imerode/imdilate use convolution?
No, imdilate is a sliding window max() operation, which is nonlinear, and therefore not, in general, a convolution. Similarly im...

1 month 前 | 0

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已回答
Take 3x3 nearest neighbours round centroids of all spots and find the median of their mean
sz=size(IM); centroidIdx=sub2ind(sz,y1,x1); T=combinations(1:3,1:3); delta=sub2ind(sz,T{:,2},T{:,1})'-(sz(1)+2); resu...

1 month 前 | 0

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已回答
Take 3x3 nearest neighbours round centroids of all spots and find the median of their mean
movingMean=conv2(IM,ones(3)/9,'same'); centroidIdx=sub2ind(size(IM),y1,x1); result=median(movingMean(centroidIdx))

1 month 前 | 0

提问

Displaying a struct containing gpuArray fields takes an extremely long time in R2024b
I find that when I create a struct (or object) whose fields are large gpuArrays, it takes an extremely long time (1-2 minutes) t...

1 month 前 | 2 个回答 | 0

2

个回答

已回答
MINLP problem in MATLAB with both integer constraints and nonlinear equality constraints
If, as @Torsten mentioned, you are in the situation where the equality constraints only depend on the continuous variables, then...

1 month 前 | 0

已回答
how to use fmincon to optimize a functio with more than one control vector where the control vectors used in constrains also?
Use the problem-based optimization framework to launch fmincon. It will look approximately like, p=optimvar('p',pi,pj); X=opti...

1 month 前 | 0

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已回答
Fit a linear equation to obtain coefficients (constants)
I have a linear equation P = a + bM + c(Y-1) + d(M(Y-1)) where a, b, c and d are coefficients (constants). P, Y and M are known...

1 month 前 | 1

已回答
MINLP problem in MATLAB with both integer constraints and nonlinear equality constraints
Such problems usually do not have solutions (EDIT: unless the equalities depend only on the continuous variables), since a nonli...

1 month 前 | 1

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已回答
parallel computing apply to my problem
Skipping the symbolic operations will speed things up, tic; t=linspace(0,0.1,1000)'; tsquared=t.^2; [a...

1 month 前 | 0

已回答
Class Property Validation for the Contents of a Cell Array Property?
You can do it, but you would have to define your own validation function, https://www.mathworks.com/help/matlab/matlab_oop/prop...

1 month 前 | 2

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