Respondida
How can I stabilize the matrix left division (i.e. "\")?
Try pinv, lsqminnorm it can stabilize somewhat the inversion with (near) singular matrix. Both bave a tolerance argument to tune...

alrededor de 2 años hace | 0

Respondida
square matrix containing Chebyshev polynomials becomes singular when its size becomes greater than a certain value
That is exactky what I have suggested in my answer: use the Chebyschev nodes t0 = 0; tf = 4; N = 75; syms x h = chebyshevT(...

alrededor de 2 años hace | 0

Respondida
square matrix containing Chebyshev polynomials becomes singular when its size becomes greater than a certain value
If you select discrete points d the Chebychev nodes see definition wiki, and not uniform, it will become well posed.

alrededor de 2 años hace | 0

Respondida
interpolate a 2D map (array) of density samples and preserve the total ?
Use trapz for the integration (not sum), it should match (up to round off) with linear interpolation and interger subsamping fo...

alrededor de 2 años hace | 0

Pregunta

xlabel/ylabel 'HorizontalAlignment' issue
I don't understand the 'HorizontalAlignment' of the text labels. It is not centered (when the figure has different size than the...

alrededor de 2 años hace | 1 respuesta | 2

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respuesta

Respondida
Coefficents of piecewise polynomial in matlab
Similar answer as here points = [1 0 -1 0 1;0 1 0 -1 0]; pp = cscvn(points) m = pp.dim; p = pp.pieces; %D = diff(poi...

alrededor de 2 años hace | 0

Respondida
cscvn of a function, coefficients and breaks
This is how to use pp m = 2; n = 5; % 25 in the original question points = rand(m,n); pp = cscvn(points) m = pp.dim; p =...

alrededor de 2 años hace | 0

Respondida
How to index two vectors together
There is FEX, and fast if you have compiler and compile the mex file. https://www.mathworks.com/matlabcentral/fileexchange/2985...

alrededor de 2 años hace | 0

Respondida
The difference between performing the fft2 and the convolution
Use this function, it will perform the convolution using fft method rightly https://www.mathworks.com/matlabcentral/fileexchang...

alrededor de 2 años hace | 0

Respondida
How can I rotate the axes' labels parallel to the orientation of the axes?
Try this (the letters of label are rotated but the aspect ratio remain constant so they can be read easily but are not look like...

alrededor de 2 años hace | 0

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Respondida
Compact way to calculate the centroid of a boundary of a set of points
@Sim The area of the polygonal (A in the book) is sum(A)/2 in Jan code. So sum(A)*3 in Jan's code is equal to 6*area. They are...

alrededor de 2 años hace | 0

Respondida
Mex function Implementation for nested-functions
you did not include operation.c in mex command

alrededor de 2 años hace | 2

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Respondida
Strange warning how to interpret it?
Fixed with update 4 https://www.mathworks.com/support/bugreports/3114312

alrededor de 2 años hace | 2

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Respondida
Compute only a few entries of a big matrix product
It will not store the result in 2D matrix but 3D array. I hope you can switch to this format of storage. x=rand(10000,10); k =...

alrededor de 2 años hace | 0

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Respondida
Matrix addition only to elements equal to zero
C=B; B0 = B==0; C(B0)=A(B0);

alrededor de 2 años hace | 0

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Respondida
Code gets stuck loading when I try to run it.
First look of your code shows that you do this mistake: https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays....

alrededor de 2 años hace | 0

Respondida
How to efficiently calculate a weighted sum of 3 dimensional matrix through a vector in matlab
This uses matrix multiplication so it should be well optimized and fast. [m,n] = size(A, [1 2]); C = reshape(A,m*n, []) * B(:)...

alrededor de 2 años hace | 2

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Respondida
Matrix inverse in objective function
The inv() is not supported by optimization expression see https://www.mathworks.com/help/optim/ug/supported-operations-on-optimi...

alrededor de 2 años hace | 0

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Respondida
Find all possible combinations of numbers with a specific array length
char(dec2base(0:4^12-1,4)+('A'-'0'))

alrededor de 2 años hace | 1

Respondida
Order of code execution seems weird
%% Function in app.PlotSetup function printProcess(app, message) app.StatusEditField.BackgroundColor = app.yellow; app.Status...

alrededor de 2 años hace | 1

Respondida
how to use plot to draw a minor arc in matlab without calculating the angle range?
% Generate A, B, C, C is the center and A B are two points on circle r = rand(); C = randn(2,1); phi1 = 2*pi*rand; A = C + r...

alrededor de 2 años hace | 1

Respondida
Multipilication of N-dimension array
D = rand(3, 3, 3); rotm1 = rand(3, 3, 2); for num=1:size(rotm1,3) for i=1:size(D,3) res(:,:,i,num)=rotm1(:,:...

alrededor de 2 años hace | 1

Respondida
Why does C{1}(1) work but C(1){1} results in an invalid array index error in MATLAB?
"I would like to understand the rationale behind MATLAB's requirement for parentheses indexing to appear last in an indexing exp...

más de 2 años hace | 0

Respondida
How can I produce this matrix?
m=6 n=3 j=randperm(m,n-1); A=accumarray([2:n;j]',1,[n,m]); A(1,setdiff(1:end,j))=1

más de 2 años hace | 1

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Respondida
Implicit expansion for griddedInterpolant
You can do your own extension as showed here https://www.mathworks.com/matlabcentral/answers/2043017-bilinear-interpolation-fas...

más de 2 años hace | 0

Respondida
Linking Matlab Libraries to Mingw for Another C++ Program
You need https://www.mathworks.com/products/matlab-compiler-sdk.html

más de 2 años hace | 0

Respondida
matrix value propagation along the rows
Any of these should do A = [1 2 3 4 5 6 7] B(1:19,1:7)=repmat(A,19,1) B(1:19,1:7)=repelem(A,19,1) B(1:19,1:7)=A(ones(1...

más de 2 años hace | 0

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Respondida
Bilinear interpolation faster than interp2?
Try this, about 5 time faster for your example clc close all n = 7; nq = 30; curv = 2.5; %qinterp2 works properly only if c...

más de 2 años hace | 1

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Respondida
adding all fields of a structures
s.bin_1=array2table(rand(2,3)); s.bin_2=array2table(rand(3,3)); s.bin_3=array2table(rand(4,3)); c=struct2cell(s); newstruc...

más de 2 años hace | 0

Respondida
How to calculate the computational complexity of filtfilt low-pass filter?
filtfilt just do twice (forward + backward) the filter. In your case it is IIR, where the complexity is O((length(a)+length(b))...

más de 2 años hace | 0

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