Linked Questions

19 votes
3 answers

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: ...
yarchik's user avatar
  • 18.4k
8 votes
2 answers

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 ...
NOhs's user avatar
  • 869
12 votes
1 answer

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 ...
xslittlegrass's user avatar
5 votes
2 answers

How to ListContourPlot an eigenvalue spectrum without jumping?

MWE: ...
Steve's user avatar
  • 1,153
2 votes
1 answer

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 ...
Erik Bernitt's user avatar
4 votes
1 answer

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 ...
Manuel's user avatar
  • 41
3 votes
2 answers

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. ...
Shamina's user avatar
  • 633
3 votes
1 answer

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 (...
Castou's user avatar
  • 31
3 votes
1 answer

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: ...
Albert DiBenedetto's user avatar
1 vote
1 answer

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 $$\sin^8\varphi-2\lambda_i^2\sin^6\varphi+(6\lambda_i^2+\lambda_i^4)\sin^4\varphi-(4\lambda_i^2+2\lambda_i^4)\sin^2\varphi+\lambda_i^4=0$$ ...
skrat's user avatar
  • 1,275
3 votes
1 answer

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(...
L.K.'s user avatar
  • 683
0 votes
1 answer

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 ...
Abdallah's user avatar