Jiali

Last seen: 5 mois il y a | Actif depuis 2014

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How to integrate over a surface with non-uniform spherical coordinate?
Dear community, I need to integrate the P over the entire cone surface composed of theta and phi. The numerical value of P...

5 mois il y a | 1 réponse | 0

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Question

Nonlinear constraints depend on the output of optimization objective
Dear all, I need to optimize two variables to minimize the norm error under some constraints. However, one variable l...

11 mois il y a | 2 réponses | 0

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Question

Obtain eigs from matrix and partially known eigenvector
The issue is that I have an input square matrix P, The values in some diagonal elements of P matrix are very big imaginary...

plus de 2 ans il y a | 2 réponses | 0

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Why ifft results of analytic signal spectrum don't match with theoretical time formula?
Dear all, I need to convert a spectrum data back to time domain. Before it, I use a simple Gaussian pulse as a test. Howev...

environ 3 ans il y a | 1 réponse | 0

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Why points inside a polygon can't be found completely by using "Inpolygon"
Dear all, I would like to find a set of points (red points in the below figure) whether inside another bunch of points (bl...

plus de 3 ans il y a | 1 réponse | 0

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Question

The eigenvalues of eigs change with the input target, Why?
Dear all, My goal is to compute the eigen-vectors of some dynamic system. However, I found that the eigenvalues vary depen...

environ 4 ans il y a | 1 réponse | 0

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Question

fsolve stopped because the problem appears regular
Dear all, I tried to solve an equation as below, but "fsolve" failed. since and data are known, only two variabl...

environ 4 ans il y a | 2 réponses | 0

2

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Question

how to use kron command to form a 2D matrix when 1D is known
Dear community, I would like to use Kron command to form a 2D stencil grid when 1D matrix of row or column is known. For e...

plus de 4 ans il y a | 1 réponse | 0

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Question

Why the Gaussian after chirp z-transform (CZT) is not correct?
Dear all, I would like to use the CZT to amplify the certain frequency range. When I use a real Gaussian signal as a test,...

environ 5 ans il y a | 1 réponse | 0

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why the Real and imaginary part of fourier transform (fft) are not zero for real odd function
Dear all, I got confused when I found that the real part of sin-modulated Gaussian function was not zero after fft. I used...

environ 5 ans il y a | 1 réponse | 0

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Question

questions about 2D chirped Z-transform (CZT)
Dear Community, I have a 2D image in K-space and need to transform back to Cartesian coordinate. But When I use the 2D...

environ 5 ans il y a | 1 réponse | 0

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Question

Why the coordinate doesn't make sense after rotation matrix (rotx)?
Hello, I got confused about the rotation matrix results. I want to rotate the structure around the z-axis with theta firs...

plus de 5 ans il y a | 1 réponse | 0

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Question

why interp2 report "input grid is not a valid meshgrid" since input grid is generated by meshgrid?
Dear Community, I need to do a 2D interpolation for a matrix data, but when I use the interp2, the function report error "...

plus de 5 ans il y a | 2 réponses | 0

2

réponses

Question

Question about 3D rotation
I tried to rotate a sequence of points in the below sequence: first-axis: Z, rotation angle is 45 degree; second-axis: X, rotat...

plus de 5 ans il y a | 1 réponse | 0

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Question

how to compute the components of fields on the sloped plane
I have compute all the components of electromagnetic fields on the normal plane (Ex, Ey, Ez, Hx,Hy,Hz). Thn I project all fields...

plus de 5 ans il y a | 1 réponse | 0

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Réponse apportée
how to solve 1D heat equation by Crank-Nicolson method
Dear Darova, The below code is What I figure out. Hopefully it helps someone. u=zeros(length(X),nstep+1); u(...

plus de 5 ans il y a | 2

Réponse apportée
how to solve 1D heat equation by Crank-Nicolson method
I figure out that the boundary is dealt with incorrectly. After re-deriving the matrix to include the boundary value, I finally ...

plus de 5 ans il y a | 1

| A accepté

Question

how to solve 1D heat equation by Crank-Nicolson method
I need to solve a 1D heat equation by Crank-Nicolson method . The tempeture on both ends of the interval is given as the fixed ...

plus de 5 ans il y a | 2 réponses | 0

2

réponses

Question

how to plot the 3D graph
I build the 3D grid and form a function based on the grid. I would like to know how to display the data shown in the below figur...

environ 6 ans il y a | 1 réponse | 0

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réponse

Question

How to compute the ratio of the insection point in each grid on the boundary of a real structure
In the Cartesian grid, the real structures are pixelized into the staircase approximation. To reduce the staircase error, the ef...

environ 6 ans il y a | 2 réponses | 0

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Réponse apportée
how to use the row&column indices returned by find to control array element in matrix way
I appreciate your quick help. It really helps me to solve the whole issue.

environ 6 ans il y a | 0

Question

how to use the row&column indices returned by find to control array element in matrix way
I have a logical matrix (X) that are generated when the element meets certain conditions in the original raw matrix (data) and u...

environ 6 ans il y a | 2 réponses | 0

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Réponse apportée
Finding rows with the closest values in two matrices matlab
I find one useful code in the file exchange called Inter-Point Distance Matrix. http://www.mathworks.com/matlabcentral/fileexcha...

environ 10 ans il y a | 0

Réponse apportée
Finding rows with the closest values in two matrices matlab
this method doesn't work because all the numeric data are generated from some images. Since the images are not always same/align...

environ 10 ans il y a | 0

| A accepté

Question

Finding rows with the closest values in two matrices matlab
I have two matrices with the same size [n,2]. One is the control matrix A and another is the test matrix B. In general, Numbers ...

environ 10 ans il y a | 5 réponses | 0

5

réponses

Question

How to adjust GUI size in remote desktop session
I know the GUI size is right for my desktop in the lab and GUI size is proportional. However, when I remotely log in, GUI size i...

plus de 10 ans il y a | 1 réponse | 0

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réponse

Question

How to show axes when I build a GUI Scatter plot
how to show axes and minortick when I build a GUI Scatter plot? By using the following code, no axes are shown in GUI. Please h...

plus de 10 ans il y a | 1 réponse | 0

1

réponse

Question

How to combine numeric contents inside a cell array with another numeric matrix
I want to combine numeric contents inside a cell array with another numeric matrix. The following is a simple demo code. %%...

plus de 10 ans il y a | 1 réponse | 0

1

réponse

Question

GUI how to display table data into figure
My problem is: I try to read some data from excel file, first display as table data inside Matlab GUI, then I want to display da...

presque 11 ans il y a | 2 réponses | 0

2

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Question

how to match with random cell name with varied format
I have a series of cell array XXXX-20-0266-3.dat XXXX-10-01-12_03.03.03 AM.dat XXXX-10-01-12_01.03.03 PM.dat XXXX-...

presque 11 ans il y a | 1 réponse | 0

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