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Guillaume


University of Brighton

7,188 total contributions since 2012

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Answered
Select specific number of random ones placed in a zeros matrix
m = zeros(1024, 1024); m(randperm(numel(m), 20)) = 1; %place 20 ones randomly in m.

3 hours ago | 0

Answered
how to read a string
split = textscan(tline, '%s%f%f%f'); txt = split{1} numbers = cell2mat(split(2:end))

3 hours ago | 0

Answered
How do I track the number of instances of a given handle?
I'm curious what you mean by "inheriting that class appears to put a lot of constraints on what I can do with my existing code i...

3 hours ago | 0

Answered
How to get field value from a struct as a variable in order to use in a code?
There's no need to. Creating separate variables is usually not a good idea. Wherever you were going to use X, use yourstruct.X. ...

4 hours ago | 2

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Answered
Having trouble finding the mean of array elements between two indices
See my comments to the question. Using a matrix, and assuming you're using R2019b since you haven't indicated a matlab version:...

5 hours ago | 0

Answered
Add empty cell inside a cell array considering a single array
Surely, by now, with all the questions you've asked, you should be able to manipulate cell arrays yourself. Anyway: desiredlen...

5 hours ago | 0

Answered
Is it possible to use a variable name like this within Matlab?
Confusingly, variable names can mean two different things now in matlab. A generic variable name, e.g. >> A = 5 is limited to ...

11 hours ago | 2

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Answered
Why the threshold is 0.90 used to obtain the white component from RGB channels ?
You will have to ask whoever wrote that code why they chose that threshold. Most likely, the answer will be : because it worked...

12 hours ago | 0

Answered
How to index something based on numbering order???
Here is one way: %input x = [2; 3; 7; 5; 1] %generate random matrix without worrying about the order A = rand(size(x, 1),...

12 hours ago | 0

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Answered
How to assign specific colors to every quiver?
I can't remember if quiver did have children before R2014b (when the graphics system changed drastically) but since R2014b it do...

17 hours ago | 0

Answered
Why is my regular expression always greedy?
Matlab regex engine has the odd peculiarity that . also matches \n by default, whereas other engines don't. So your greedy .* in...

1 day ago | 0

Answered
Using data from a cell
I need new variables created for each of the character vectors No! As Stephen already told you this would worst way to go about...

1 day ago | 0

Answered
How to create a new table array combining the values every n,th element from two different table arrays
In my case I would like to add every 60 values of A to add 59 consecutive values of B So, assuming that A and B are indeed vect...

1 day ago | 0

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Answered
mod gives incorrect result
See my comment to Kalyan's answer for why your naive attempt doesn't work, and learn about floating point numbers so that you ca...

2 days ago | 2

Answered
How do I get my matrix dimensions correct?
t_loading, v_trailertank, and co. (the random variables) are column vectors 1000 rows by 1 columns. To these you are adding x./...

2 days ago | 0

Answered
Use rowfun to sum multiple columns by group
rowfun is not the correct function for this. rowfun applies the function by rows and consider the input variables as separate in...

3 days ago | 0

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Answered
"Index exceeds the number of array elements (11)."
You create a variable called disp: disp = 'RLC Circuit' %removed brackets which didn't anything Which shadows the built-in ...

3 days ago | 0

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Answered
What is the default varargin in the GUI callbacks? What are the differences between varargin{1} and varargin{2}.Source?
Yes, as Stephen says in his very thorough comment, that advice is utter rubbish. Don't do that it pointlessly obfuscate the code...

6 days ago | 0

Answered
I have a Table in MATLAB. In one colum, lots of texts are seperated in comma. I wish to delimate those in seperate colums.
It's not clear what you want as an output since for each row you're going to get a different number of elements after the split....

6 days ago | 0

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Answered
mat lab terms of use
For this you should contact Mathworks directly. We're just a bunch of volunteers here.

9 days ago | 0

Answered
Create an array iterating on another array
If I understood correctly: out = zeros(size(N)); for row = 1:size(N, 1) [isfound, where] = ismember(SP, G{row}(1, :)); %...

9 days ago | 0

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Answered
Create new .wav files around findpeak outputs
Here's how I'd do it: infile = 'C:\somewhere\somefolder\test_100m.wav'; %I'd recommend you use full path instead of relying on...

9 days ago | 1

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Answered
calculating the number of days within each month for a range of dates
You've got to learn to work with datetime arrays. There's no need to use datenum to construct datetimes, and adjusting the defau...

10 days ago | 0

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Answered
Transformation of the Matrix in a Loop
With your invented notation it's difficult to know what you actually have in matlab. Assuming you have a matrix such as: Z = [...

11 days ago | 1

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Answered
Old Matlab script not running on newer version
The equivalent of your wavwrite using audiowrite is: audiowrite(fullfile(subj_name, sprintf('%d.wav', block_num)), recordedaudi...

13 days ago | 1

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Answered
Merging matrices by comparison of values of several columns
Nearly right [~, whichArows, whichBrows] = intersect(out1(:, 2:4), out2(:, 2:4), 'rows'); C = [out2(whichBrows, 5), out1(which...

14 days ago | 0

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Answered
Using For Loop to get different outcomes
if ismember(psi_value, [0.05, 0.15, 0.25, 0.35]) %maybe use ismembertol s_plot = 0.8; else s_plot = 0.2; end Note ...

14 days ago | 0

Answered
Store a group of points (given x, y, and value) into image efficiently
img = zeros(1000, 1000); img(M(:, 2) + 1000 * (M(:, 1) - 1)) = M(:, 3);

14 days ago | 1

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Answered
Negative Value when using Trapz
Can someone tell me as to why this is the case Because your x vector is decreasing, so is negative for each trapeze a = trapz...

15 days ago | 0

Answered
Create two arrays on the basis of other arrays
%first find which of A or B elements are going into. Only depends on V isA = false(size(V)); %put in A (true) or B (false) lA...

15 days ago | 0

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