Beantwortet
Finding x and y values of minimum z in 2-variable function.
The continuous minimum can't be at (5,2) as you claim. Direct evaluation shows that the value of z at (5.5,10) is lower. loopi...

etwa ein Jahr vor | 0

Beantwortet
Using fft and ifft with less frequencies than input points
What I would want to do, is to insert an N, f.e. N=100, but get an array 10001x1. %Grid Nx = 100; L = 10; dx = L/(Nx-1); ...

etwa ein Jahr vor | 0

Frage


Why does the Code Analyzer flag this as an error?
Why does the Code Analyzer flag this code as an error? It runs fine: try error("It's bad") catch ME warning('Error...

etwa ein Jahr vor | 2 Antworten | 0

2

Antworten

Beantwortet
How to fastly calculate this real number matrix manipulation?
e=(1:A)'; I=reshape(e,1,1,[]) == repmat( e,1,B); Xp=permute(X,[3,2,1]); D=X./(X-Xp); D(I)=1; M = ipermute( prod(D,1) ,[...

etwa ein Jahr vor | 0

Beantwortet
How to solve the error generated while defining custom FFT layer?
Your predict() method is written to expect that the input X will be a cell array. It's not clear why you expect this, but you sh...

etwa ein Jahr vor | 0

| akzeptiert

Beantwortet
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); ...

etwa ein Jahr vor | 0

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

etwa ein Jahr vor | 0

Beantwortet
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);...

etwa ein Jahr vor | 0

| akzeptiert

Beantwortet
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 ...

etwa ein Jahr vor | 0

| akzeptiert

Beantwortet
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...

etwa ein Jahr vor | 0

| akzeptiert

Beantwortet
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...

etwa ein Jahr vor | 1

Beantwortet
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...

etwa ein Jahr vor | 0

Beantwortet
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 ...

etwa ein Jahr vor | 3

| akzeptiert

Beantwortet
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 ...

etwa ein Jahr vor | 0

Beantwortet
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...

etwa ein Jahr vor | 0

| akzeptiert

Beantwortet
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)=[]; ...

etwa ein Jahr vor | 0

Frage


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...

etwa ein Jahr vor | 1 Antwort | 0

1

Antwort

Beantwortet
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...

etwa ein Jahr vor | 0

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Discussion


Why doesn't MathWorks put its utility files in private\ folders?
On my computers, this bit of code produces an error whose cause I have pinpointed, load tstcase ycp=lsqlin(I, y, Aineq, bineq)...

etwa ein Jahr vor | 4

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

etwa ein Jahr vor | 0

Beantwortet
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...

etwa ein Jahr vor | 1

| akzeptiert

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

etwa ein Jahr vor | 1

Beantwortet
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...

etwa ein Jahr vor | 0

Beantwortet
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...

etwa ein Jahr vor | 0

Beantwortet
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...

etwa ein Jahr vor | 0

Beantwortet
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...

etwa ein Jahr vor | 0

Beantwortet
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 ...

etwa ein Jahr vor | 1

| akzeptiert

Beantwortet
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,...

etwa ein Jahr vor | 1

| akzeptiert

Beantwortet
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 ...

etwa ein Jahr vor | 0

Beantwortet
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

etwa ein Jahr vor | 0

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