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How do I edit a loop to be able to store the variables and outputs used in each loop in a way which can be graphed?
D = 0.3 k = 0.0002 Rvalues = 10^4:10^5:10^8; nR=numel(Rvalues); X=nan(1,nR); for i=1:nR R=Rvalues(i); ...

16 dagen ago | 0

Answered
reshape 4-dimension array
Download this File Exchange package, https://www.mathworks.com/matlabcentral/fileexchange/115340-block-transposition-permutatio...

18 dagen ago | 0

Answered
Speed up this bottleneck line of code
If you can construct c in transposed form, there are some savings to be had, n = 10000; m = 5000; k = 20; a = rand(n,m);...

18 dagen ago | 0

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Answered
nonlinear spline fit with unknown upper bound of interpolation domain
The upper bound is way larger than the fitted parameters at x < 6, causing an extremly large curvature at x > 6 which makes the ...

22 dagen ago | 0

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Answered
Differentiating in one direction using FFT2
fft2(u) is equivalent to fft( fft(u,[],1) ,[],2), if that helps at all. Truthfully, it doesn't appear that you need to use fft2...

22 dagen ago | 0

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Answered
need to vectorize efficiently calculating only certain values in the matrix multiplication A * B, using a logical array L the size of A * B
Is v much smaller than m or n? If so, one approach might be with an outer product decomposition: L=sparse(L); %if L was not pre...

23 dagen ago | 1

Answered
shared colorbar for specific plots in tiledlayout
Using nestedLayouts from the File Exchange, https://www.mathworks.com/matlabcentral/fileexchange/161736-grids-of-tiled-chart-la...

24 dagen ago | 0

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MATLAB Optional Function Arguments
Using the arguments block is more robust, but I'm unable to find a way to make multiple inputs independently optional. The way ...

24 dagen ago | 2

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Answered
Set number of rows in output variable using indexing within for loop, add variable to new table
I would like to put the two calculated variable columns directly after the variable column in the original table. And you want ...

25 dagen ago | 0

Answered
What happens if the termination condition is satisfied before the constraint in matlab's fmincon?
The only time fmincon will stop without satisfying the constraints (within ConstraintTolerance) is if the MaxItertions or MaxFun...

25 dagen ago | 0

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Answered
How to remove columns in very large matrices.
Use a sparse matrix, if applicable. matrix=sprand(1750000 , 2000, 1000/1750000); whos matrix tic; matrix(:,1:3:end)=[]; ...

25 dagen ago | 0

Question

Suppress uitable cell borders
In Excel, there are buttons to select particular spreadsheet cell borders and hide them. Is there an analogous way to suppress t...

26 dagen ago | 1 answer | 0

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answer

Answered
How to find the mask boundaries?
[Y,X,Z]=find(Mask); S=X+Y+Z; [~,i]=min(S); [~,j]=max(S); [Xmin,Ymin,Zmin, Xmax,Ymax,Zmax] =deal( X(i), Y(i), Z(i), X...

26 dagen ago | 0

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Answered
How to restart a new backgroundPool
delete(pool) pool = backgroundPool;

29 dagen ago | 0

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Slim code for smoothing spline fit with predefined knots, concavity and monotonicity
One path would be to obtain the matrix form for the spline interpolator, which I do in the example below using func2mat from th...

29 dagen ago | 1

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Answered
"isfield" for hidden field in optimoptions
One way: options = optimoptions(@fsolve,'JacobPattern',speye(5)); isNonDefault = ~isequal(options.JacobPattern, optimoption...

29 dagen ago | 1

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nargin of optional arugments
The function "func" has 3 input arguments, why nargin is 1? There are 5 input arguments, not 3: func(1,arg2=3,arg3=5) func...

30 dagen ago | 0

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Why is my matrix being multiplied by scientific notation?
That's the default way that double floats are displayed in the command window. It is purely a matter of display. The actual valu...

ongeveer een maand ago | 0

Answered
How to Simplify Passing Multiple Arguments from Structs in MATLAB Function Calls?
You can use namedargs2cell and comma-separated list expansion to pass multiple name-value pairs,e.g., function main(struct_n,st...

ongeveer een maand ago | 0

Answered
Check if the value for a field in a struct exists
Watch your struct() syntax, A=struct('a',[]) %field 'a' with empty matrix isempty(A.a) B=struct('a',{{}}) %field 'a' with em...

ongeveer een maand ago | 0

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Image registration on segmented images
My question is thus : Is it possible to perform an image registration on a segmented image? You could use the segmentation to ...

ongeveer een maand ago | 1

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Tally Instances of Negative Numbers in an Array (for loop)
We don't know the names of the variables in the .mat file. If it contains a variable named B that you are trying to load into A,...

ongeveer een maand ago | 1

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Answered
Poor performance of trainNetwork() function as compared to train()
I have tried playing with the training parameters in the trainNetwork and this is the best I was able to set You can try using ...

ongeveer een maand ago | 0

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How to restrict train() function to a select gpu pool?
This might work, setenv('CUDA_VISIBLE_DEVICES', '1,2'); % MATLAB indexes from 1, CUDA from 0

ongeveer een maand ago | 0

Answered
Alternative to ginput for finding curve intersections with unevenly spaced data in MATLAB
Use fminbnd or fzero, x=sort(rand(1,12)*5); y1=[0,1,-1*x(3:end)+3+2*x(3)]; y2=2*x-3; f=@(z) interp1(x,y1,z)-interp1(x,y2,...

ongeveer een maand ago | 1

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Answered
Linear polyfit results don't look like they fit
Because both your x and y data have random errors, polyfit() is not going to be the best tool. I would recommend instead linear2...

ongeveer een maand ago | 0

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fminunc step size too small
It's not clear to me whether you are are talking about the StepTolerance or the FiniteDifferenceStepSize, both of which you have...

ongeveer een maand ago | 0

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Answered
how to update MATLAB 2024b when cannot uninstall old version
I've never heard of an "already installed" message when trying to update. At most, it may tell you to close any open instances o...

ongeveer een maand ago | 0

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vector conversion from a vector of numbers to a vector cell of chars.
Y=[0 4 6]; X=Y+""; X={X{:}}

ongeveer een maand ago | 0

Answered
Help Plotting an Ellipse from X,Y data
a=3; b=2; %Major/minor ellipse radii plot(rand(1,5)); hold on; axis equal ellipse = translate( scale(nsidedpoly(1000),[a,b]...

ongeveer een maand ago | 0