Christopher McCausland
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Contribute at least one answer each month for 12 consecutive months
Awarded to Christopher McCausland on 02 Feb 2022
Answer 1 question that was unanswered for more than 30 days
Awarded to Christopher McCausland on 17 Jan 2022
Accept 5 answers given by other contributors
Awarded to Christopher McCausland on 11 Nov 2021
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Content Feed
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 ...
22 days ago | 1 answer | 0
1
answerI 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...
1 month ago | 0
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
1 month ago | 0
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...
1 month ago | 0
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...
1 month 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...
2 months ago | 1 answer | 0
1
answerCan 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...
2 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...
3 months ago | 1 answer | 0
1
answerFinding 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...
3 months ago | 0
How to find elements in an array faster / without using for loop?
Hi Jan, The 'ismember' function should be able to do this! Christopher
3 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 ...
4 months ago | 1 answer | 0
1
answerQuestion
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...
4 months ago | 0 answers | 0
0
answersUnable 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....
4 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...
5 months ago | 1 answer | 0
1
answerstudent license and simpower library
Open matlab -> Add-ons -> SimScape Electrical/ Simscape power systems (is what I think you are looking for)
5 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...
5 months ago | 0 answers | 0
0
answersWhen 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...
5 months ago | 0
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? ...
6 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...
6 months ago | 1 answer | 0
1
answerQuestion
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...
6 months ago | 1 answer | 0
1
answersample 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...
7 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...
7 months ago | 1 answer | 0
1
answerHow to know the gain value used in this controller when I know the input and output of the pid controller
Mathematically speaking gain is the output divided by the input of a system. The next question is if this produces a linear or n...
7 months ago | 0
Question
Plot - Remove axis ticks but keep grid lines
Hi, I am producing a graph to view open source polysomnography data. I have several arrays in one plot window with an offset be...
8 months ago | 1 answer | 0
1
answerB-spline fit of airfoil coordinates
Hi Marco, Thats a really cool problem! Looking at it I would assume that the resoloution between x = 0 and x = 0.01 is not gr...
9 months ago | 0
How to export live script to latex beamer document class?
Hi @Barbab, One soloution maybe to use mcode if you are not already doing so. I would also suggest taking a look at implementin...
9 months ago | 0
How to let Matlab show large trends in Nyquist Plot?
Hi Zizhuo, You are correct, considering a system L(s); where L(s) has two poles at the origin, will give a 360 degree colocwis...
10 months ago | 0
Problem with readtable MATLAB R2020a+
Hi Paolo, I am hoping I have an answer for you however I am working in MATLAB 2020b, it is post 2020a so I think the changes s...
10 months ago | 0
Create a grouped boxplot
Hi NA, From the documentation here (See section boxplotGroup(__,'primaryLabels',c) ) the number of primary lables should matc...
10 months ago | 1
| accepted
