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Christopher McCausland


Last seen: Today Active since 2019

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  • Knowledgeable Level 3
  • 12 Month Streak
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Answered
License my account with this educational email account.
Hi Nazmul, I think you should still be okay, you can tie your academic email to the campus license programme here. If that do...

23 days ago | 0

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Answered
Box counting method in a tif image
Hi Arlete, If you could share the image that would be great. Having a look at your code the ~ will turn 'c' into a logical ar...

2 months ago | 0

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Question


Datatype duration midnight roll over
Hello, I have a table with a series of categorical events and associated timestamp (duration datatype) at which these events ha...

2 months ago | 2 answers | 0

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answers

Answered
From audio signal to mean of frequency responses
Hi Julia, A butterworth filter can be applied with the butter() command as detailed in the documentation. A more intuative app...

2 months ago | 1

| accepted

Answered
how to open st file
Hi Anastasis, Can I ask what you are working on, I am researching a very similar topic and its always good to chat! In terms o...

2 months ago | 0

Question


Importing a table as (:,1) timedate (:,2) categorical
Hi there, I have used the import functionality in the past without issue, I am currently trying to import a .txt file which con...

4 months ago | 1 answer | 0

1

answer

Answered
Remove a set of intervals from an array
Hi Ciara, There are a couple of diffrent ways to do this, as always it depends on speed vs. understanding. A very understandabl...

4 months ago | 0

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Question


Parrellel server dir() for files local to the server
Hello, I wish to move computation from a local machine with .m files stored locally to a parrellel compute server with the .m ...

5 months ago | 1 answer | 0

1

answer

Answered
I want to include a variable in my figure title when I save to a directory.
Hi Sandra, Yes this is possiable, you can either use strcat() to 'build' the title string first or just use title(), it'll look...

6 months ago | 0

Solved


add one to x

6 months ago

Answered
How to add noise in [0 2] interval to an elements of an array randomly?
Hi Ayberk, Have you tried awgn(r1)? r1Gaus = awgn(r1); Kind regards, Christopher

6 months ago | 0

Answered
How can i add variable load to my source
Hi Srikanth, If you want this model to run with respect to time you should inlude a 'clock' block. To get the loads to turn o...

6 months ago | 0

Answered
How to create readable decision trees
Hi Awais, I had a similar problem with Markov chains recently. I ended up using digrapgh() to solve the problem, that being sai...

6 months ago | 0

Question


pcolor - Numeric Ruler -> limits and scale commands
Hi, I have a cwt figure plotted with pcolor. I can open the property inspector on the figure and manually change the "Scale" pr...

6 months ago | 1 answer | 0

1

answer

Answered
Can I add a toolbox to a pre-R2022a installation via the Add-On Manager?
Hi Will, As far as I am aware you still should be able to get the PCT from the add-on manager via the "Install button". Have yo...

6 months ago | 0

| accepted

Question


Fixed node locations using graphplot() with Markov chains
Hi, I have developed a few lines of code to generate markov chains from a transition vector ('stagesVec'). The code works well...

7 months ago | 1 answer | 0

1

answer

Answered
Finding formants in speech signal
I Piesioslaw, To recalculate your axis have a look at my example below; % Compute a 1024 point fft for my signal ecgcleanNoDC...

8 months ago | 0

Answered
How to find elements in an array faster / without using for loop?
Hi Jan, The 'ismember' function should be able to do this! Christopher

8 months ago | 1

Question


Truncated SVD returns unexpected 1*1 result
Hi, I am currently prefoming SVD on six channels varying in time of the same type of biometric data. The recorded channels are ...

8 months ago | 1 answer | 0

1

answer

Question


rdann cannot find file on specified path (Physionet wfdb)
Hi there, I am working with physionet data (2018 you snooze you loose compitition) and the wfdb toolbox. I am trying to use the...

8 months ago | 0 answers | 0

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answers

Answered
Unable to install the add-on. Try again later.
Hi Vivek, I had the same issue but installed the toolbox manually and it worked fine. Here is a link to instructions on how to....

8 months ago | 0

Question


PCA output gives NaN after normalizing input matrix
Hello, I have an array of 117 features and 125941 observations. I preformed principle component analysis via svd(x) (code below...

10 months ago | 1 answer | 0

1

answer

Answered
student license and simpower library
Open matlab -> Add-ons -> SimScape Electrical/ Simscape power systems (is what I think you are looking for)

10 months ago | 0

Question


Principle Component Analysis/ Singular value decomposition; great with ovariancancer dataset terrible with my data
Hello, I am currently getting to grips with PCA, I came accorss a great tutorial from Steve Brunton on its use with matlab. Thi...

10 months ago | 0 answers | 0

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Answered
When using the 1D convolution example code from MATLAB am getting an error about incorrect use of '='.
Hi Joseph, If you have a look at the docuementation it calls for named pairs for input, this would look something more along th...

10 months ago | 0

Answered
Word recognition power frequency domain
Hi Leon, From what I can understand you are looking for the local maximums, however this returns vectors of varying lengths? ...

11 months ago | 0

| accepted

Question


Table of Tables or cell of Tables
Hi, I am preforming machine learning on 13 channels of data and am currently at the feature extraction stage. I have created 13...

11 months ago | 1 answer | 0

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answer

Question


3D array, remove columns where second array == -1
Hi, I am curently processing 13 channels of PSG data. I take my data and create 10 second buffers with 5 second overlaps for th...

11 months ago | 1 answer | 0

1

answer

Answered
sample Matlab COM object for C# .NET Framework application
Hi, The MATLAB documentation has lots of examples and documentation to get you going. Here's a link to an example. And a se...

11 months ago | 0

Question


Array prealocation - Extra array of zeros in 3D array
Hi, I have a 13 channel signal recorded over several hours. I wish to take all channels, split them into 10 second windows wit...

11 months ago | 1 answer | 0

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