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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(...

2 years 前 | 0

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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.

2 years 前 | 0

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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...

2 years 前 | 0

提问

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...

2 years 前 | 1 个回答 | 2

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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...

2 years 前 | 0

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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 =...

2 years 前 | 0

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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...

2 years 前 | 0

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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...

2 years 前 | 0

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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...

2 years 前 | 0

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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...

2 years 前 | 0

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

2 years 前 | 2

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

2 years 前 | 2

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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 =...

2 years 前 | 0

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

2 years 前 | 0

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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....

2 years 前 | 0

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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(:)...

2 years 前 | 2

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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...

2 years 前 | 0

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

2 years 前 | 1

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

2 years 前 | 1

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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...

2 years 前 | 1

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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(:,:...

2 years 前 | 1

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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...

2 years 前 | 0

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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

2 years 前 | 1

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

2 years 前 | 0

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

2 years 前 | 0

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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...

2 years 前 | 0

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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...

2 years 前 | 1

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已回答
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...

2 years 前 | 0

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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))...

2 years 前 | 0

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How do I include or make a discrete variable for an optimization problrm?
To restrict x1 to { 2, 5, 7, 8 } You might make slack variables x1 = 2 + 3*y1 + 2*y2 + 1*y3; with constrants y1, y2, y3 inte...

2 years 前 | 0