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Jiali


Last seen: mer än ett år ago |  Active since 2014

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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...

mer än ett år ago | 2 answers | 0

2

answers

Question


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...

ungefär 2 år ago | 1 answer | 0

1

answer

Question


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...

nästan 3 år ago | 1 answer | 0

1

answer

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...

mer än 3 år ago | 1 answer | 0

1

answer

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...

mer än 3 år ago | 2 answers | 0

2

answers

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...

mer än 3 år ago | 0 answers | 0

0

answers

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,...

ungefär 4 år ago | 0 answers | 0

0

answers

Question


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...

ungefär 4 år ago | 1 answer | 0

1

answer

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...

ungefär 4 år ago | 0 answers | 0

0

answers

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...

mer än 4 år ago | 1 answer | 0

1

answer

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 "...

mer än 4 år ago | 2 answers | 0

2

answers

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...

mer än 4 år ago | 0 answers | 0

0

answers

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...

mer än 4 år ago | 0 answers | 0

0

answers

Answered
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(...

mer än 4 år ago | 2

Answered
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 ...

nästan 5 år ago | 1

| accepted

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 ...

nästan 5 år ago | 2 answers | 0

2

answers

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...

ungefär 5 år ago | 1 answer | 0

1

answer

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...

ungefär 5 år ago | 2 answers | 0

2

answers

Answered
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.

mer än 5 år ago | 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...

mer än 5 år ago | 2 answers | 0

2

answers

Answered
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...

ungefär 9 år ago | 0

Answered
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...

ungefär 9 år ago | 0

| accepted

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 ...

ungefär 9 år ago | 5 answers | 0

5

answers

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...

mer än 9 år ago | 0 answers | 0

0

answers

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...

mer än 9 år ago | 1 answer | 0

1

answer

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. %%...

mer än 9 år ago | 1 answer | 0

1

answer

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...

nästan 10 år ago | 2 answers | 0

2

answers

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-...

nästan 10 år ago | 1 answer | 0

1

answer

Question


reading mixed format csv data with empty value '-'
The data is mixed formatted. I just list the float number parts to show you my problem. 1 1 100.3 -45000 -0.23 0.2555 600...

nästan 10 år ago | 1 answer | 0

1

answer