# Marcus Rosales

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**Content Feed**

Question

Feature for eigs involving just positive eigenvalues

Hello, just a quick question involving eigs(). There's an option to find the N eigen values closest to an eigenvalue E, but is t...

26 jours ago | 1 answer | 0

### 1

answerQuestion

Interpolation for 2D matricies

Basically just wondering if matlab has a feature where you can interpolate a given matrix. For instance, say you have an NxN mat...

4 mois ago | 1 answer | 0

### 1

answerQuestion

Accessing order pair from sparse matrix

Hello, my question has to do with accessing the indicies of a sparse matrix. Say we define $S=sparse(M)$, then if we put in the...

4 mois ago | 2 answers | 0

### 2

answersQuestion

Finding average of matrix elements within a specified window

So I am trying to clean some plots up and I think I can do so if I had a function which took in some matrix A and returned a new...

4 mois ago | 1 answer | 0

### 1

answerQuestion

Filling in gaps in plot

Hello, I am trying to generate some plots which look a little prettier than what I currently have. An example is attached. I am...

4 mois ago | 1 answer | 0

### 1

answerQuestion

Need Help Understanding a peculiar result when comparing MATLAB's Eigenvectors to my own

Hello everyone, I am working on a simulation and have ran into an issue. To begin I am starting off with a 2D tight binding Hami...

5 mois ago | 0 answers | 0

### 0

answersQuestion

Help Cleaning up some plots

Hello, I have some plots I got from a simulation, which give me the results I should be getting. My advisor asked me to clean th...

9 mois ago | 0 answers | 0

### 0

answersQuestion

Filtering a 2D plot from pcolor

Hello, just wondering what a good way to filter a plot obtained from a matrix of values, M, when using pcolor(m) with shading in...

11 mois ago | 1 answer | 0

### 1

answerQuestion

Using an external hard to run a bigger simulation

Sooo I have been trying to do a simulation to produce some plots for some time now and it is now apparent that I need to use a b...

plus d'un an ago | 1 answer | 0

### 1

answerQuestion

Error when saving a work space

Hello, I am trying to save a workspace after I run a simulation but something seems to be going wrong... I have attached two scr...

plus d'un an ago | 1 answer | 0

### 1

answerQuestion

Can you edit a pcolor plot after generating one?

Hopefully an easy question here. I am using pcolor's interpolation option to give me a map of a fourier transform (FT) of an NxN...

plus d'un an ago | 1 answer | 0

### 1

answerQuestion

Ways of plotting a matrix

Hello, I am working on a simulation which diagonalizes a matrix for me, then I take the eigen vectors of said matrix and build a...

plus d'un an ago | 1 answer | 0

### 1

answerQuestion

Need better resolution in my plot!

Hello, I am working on a plot of a local density of states and want to know if anyone has any suggestions to improve the reso...

plus d'un an ago | 1 answer | 0

### 1

answerQuestion

Tight binding simulation issues

Hello, This may be too far on the physics side of things, but I figured I may try and ask anyways. My main issue comes from the...

plus d'un an ago | 0 answers | 1

### 0

answersUsing existing arrays in workspace

You might find memoize useful.

plus d'un an ago | 0

| accepted

Question

Using existing arrays in workspace

Hello, I am currently writing some code which finds the eigenstates of a Hamiltonian, but each time I run the code I need to so...

plus d'un an ago | 3 answers | 0

### 3

answersQuestion

Solution to nonlinear differential equation

Hello, I am trying to solve the following differential equation, but I am running into some issues when using ODE45: subjec...

plus d'un an ago | 1 answer | 0