# Hollis Williams

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**Content Feed**

Question

Processing Frames from a Video

I have a piece of code where I read an image and then do some processing with it. If I instead have an AVI file, is there a sim...

1 month ago | 1 answer | 0

### 1

answerQuestion

Plotting Blue Pixel Values against Distance

I have obtained the following blue strip where the ''brightness'' decreases as one moves from left to right. If the total dista...

2 months ago | 1 answer | 0

### 1

answerQuestion

Numerically solving a pair of coupled second order ODES with odeToVectorField

I am attempting to use some of the functions in MATLAB to numerically solve a pair of coupled second order ODEs of the form \...

5 months ago | 1 answer | 0

### 1

answerQuestion

Putting Screenshots from Videos into an Array

I have a set of 3 videos and would like to take four screenshots from each one at the same times (ie. frames) to put into a 3x4 ...

1 year ago | 0 answers | 0

### 0

answersQuestion

Drawing a Best Line Fit for some Points

I have collected some experimental data which results in a set of points with x- and y- coordinates, if I put these into a vecto...

1 year ago | 1 answer | 0

### 1

answerQuestion

Plotting Two Data Sets on a Figure

I have two sets of data which can be plotted as a sets of discrete points given by (x,y) coordinates on a 2D plot. Is there som...

2 years ago | 1 answer | 0

### 1

answerQuestion

Plotting Multiple Curves on the Same Graph

I am plotting a graph of radial velocity against varying radius, but there is also a parameter in the velocity expression simila...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to use Maths Font for Graphs in MATLAB

I have produced a graph from some simulations which I intend to use in presentations and/or journal articles, but I have been to...

3 years ago | 1 answer | 0

### 1

answerQuestion

Improving Presentation of a Graph

I have produced a graph running some simulations which I would like to use in Powerpoints and whose presentation and professiona...

3 years ago | 3 answers | 0

### 3

answersQuestion

Superimposing Graphs by Importing Data

I have two different MATLAB files where I end up with a graph of drag force plotted against a dimensionless parameter. I would ...

3 years ago | 0 answers | 0

### 0

answersQuestion

Graph of Convergence for Drag Force

I have a code with MATLAB where I set the number of boundary nodes around a sphere and then evaluate functions at the nodes to g...

3 years ago | 0 answers | 0

### 0

answersQuestion

Adding Zeroes and Ones into a Vector

I have a 1x300 vector and would like to make it into a 1x400 vector by inserting a 0 after every third element, a 0 after every ...

3 years ago | 2 answers | 0

### 2

answersQuestion

Converting to a New Coordinate System

I have a column vector and am trying to convert it into a new coordinate system. The way I would like to do this is to start wi...

3 years ago | 0 answers | 0

### 0

answersQuestion

Adding Zeroes to a Vector

I have a row vector which I have created by repeating the same vector many times and would like to add zeroes onto the vector, s...

3 years ago | 1 answer | 0

### 1

answerQuestion

Cross Product of an Array

I have an array of size 3 x 100 and I basically want to create a new array where I take each column vector in the array and comp...

3 years ago | 2 answers | 0

### 2

answersQuestion

MATLAB won't load

I was using MATLAB and then had an error with my desktop and had to turn the computer off, I think I made the mistake of not clo...

3 years ago | 0 answers | 0

### 0

answersQuestion

Change a 3x100 double to a 300x1 double

I have a 3 x 100 double ie. 100 column vectors next to each other all with 3 rows, and I need to take each column vector and put...

3 years ago | 1 answer | 0

### 1

answerQuestion

Switching a Boundary Condition to Spherical Coordinates

I am working with a problem on a sphere where I have a formula which gives me the coordinates of a number of nodes distributed a...

3 years ago | 0 answers | 0

### 0

answersQuestion

Creating a Linear System with a Double Loop

I am dealing with a system where I have one sphere inside of a larger one and I work with the radial vector for the distance bet...

3 years ago | 0 answers | 0

### 0

answersQuestion

Question about Notation for Creating Matrices

I am currently reading a piece of MATLAB code in which matrices are created, but I am not sure what exactly the notation with co...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to Make a Matrix Diagonal with Matlab?

I am working on a quantum mechanics problem and would like to get a 4x4 matrix A into diagonal form such that A=UDU^{-1}. Basic...

4 years ago | 1 answer | 0

### 1

answerQuestion

Distance between Global Maximum of a Wave Pattern and next Consecutive Maximum/Minimum

<</matlabcentral/answers/uploaded_files/82497/1000sec.jpg>> I have a set of wave patterns (one example wave pattern included ...

5 years ago | 1 answer | 0

### 1

answerQuestion

Distance from Major Peak to next consecutive maxima/minima

Sorry for asking a basic question but I am a bit stuck with this and not been using Matlab for long. Basically I have a lot of ...

5 years ago | 0 answers | 0