Linked Questions

18
votes
3answers
1k views

How to group and join points

It seems there are many similar questions on Mathematica.SE, but none addresses (to the best of google) exactly my problem. I have the following data: ...
6
votes
2answers
704 views

Reordering numerically calculated eigenvalues assuming smooth dependence on a parameter

As was discussed in a different question here on SE (link) if you compute eigenvalues numerically of a matrix which depends on a parameter y, the resulting plot of ...
12
votes
1answer
837 views

Sorting eigenvectors according to its projection

The problem I'm trying to calculate the eigenvalues and eigenvectors of a matrix that depends on a parameter x. As x changes, I ...
1
vote
1answer
3k views

How to plot eigenvalues as a function of parameters in a dynamic module?

I am trying to make a fancy interactive plot that shows how the eigenvalues of a matrix mat change under variation of parameters ...
4
votes
2answers
314 views

How to ListContourPlot an eigenvalue spectrum without jumping?

MWE: ...
3
votes
1answer
2k views

How to sort eigenvalues?

I am trying to find Eigenvalues to a 12x12 Matrix ($H$) dependent on two variables $x$ and $y$. Later I want to do a 3D plot of one eigenvalue ($E$) over $x$ and $y$. An analytical solution is not ...
3
votes
2answers
206 views

Plot and an error

I have set of matrices(multiplied to give U123[q, p, r]) and would like to diagonalize U123[q, p, r] and plot the eigenvalues. ...
3
votes
1answer
209 views

Discontinuities in eigenvalues plotting with Plot3D

I have a 6x6 matrix, depending on 2 variables kx and ky and defined as the sum of the two following matrices (...
3
votes
1answer
160 views

Graphs Plotting Discontinuous

I'm trying to plot a graph from the eigenvalues of a matrix I created. The graph shows with discontinuities in it and I was looking for some feedback. Here's the code: ...
1
vote
1answer
144 views

Is the output to Solve ordered or are the solutions randomly placed?

I am trying to find the roots of a polynomial of eight degree $$\sin^8\varphi-2\lambda_i^2\sin^6\varphi+(6\lambda_i^2+\lambda_i^4)\sin^4\varphi-(4\lambda_i^2+2\lambda_i^4)\sin^2\varphi+\lambda_i^4=0$$ ...
3
votes
1answer
80 views

Some glitch in the Plot: Two approaches for plotting give different results

I have a matrix whose eigenvalues have to be plotted. I am using two techniques but they are not the same. Please guide me on this. Here is first command or code used for plotting the eigenvalues(...
0
votes
1answer
68 views

Mathematica's Plot3D function gives me a scrambled plot

When I plot the band structure of the Lieb lattice, which has the Hamiltonian given in this code, I get a scrambled plot in the output. I've tried the exact same procedure with many different lattices ...