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Guillaume


University of Brighton

7,300 total contributions since 2012

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Answered
Accessing field data in nonscalar structure array
This is one of the reason I dislike multilevel structures (the other being they're very inefficient memory-wise), there's no eas...

18 hours ago | 2

Answered
Using Matlab to Organize Excel Data into Separate Columns
It's trivial to do with unstack: demodata = table(repelem({'Object1'; 'Object2'}, 3), repmat({'X'; 'Y'; 'Z'}, 2, 1), rand(6, 1)...

19 hours ago | 1

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Answered
Have data in subfolders available
Firstly, it's not a good idea to mix code and data folder. The two should be completely separate, so that your code can work reg...

22 hours ago | 1

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How to arrange time series data into yearly groups?
A simpler and faster way of obtaining the same as Joe's answer: dataInitial = readtimetable('Data.xlsx'); dataFinal = table(da...

23 hours ago | 0

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Distance between two point with the same value
Assuming euclidean distance metric: n = randi(3, 10); %demo input vals = unique(n); %get unique values in n mdistances =...

1 day ago | 1

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Answered
Preprocessing using readtable()
Assuming you don't know which rows of the text file correspond to your start and end timestamps, what you want cannot be achieve...

1 day ago | 1

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Answered
Why does the for loop give wrong answer
For a start make sure that your numbers are all in the correct units. It looks like your density is in SI () but your pressure c...

2 days ago | 0

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Answered
Extracting lower triangle excluding the main diagonal elements to a string
B = strjoin(arrayfun(@(row) strjoin(compose('%d', A(row, 1:row-1)), ' '), 2:size(A, 1), 'UniformOutput', false), '\n') is one w...

2 days ago | 1

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Answered
How I do evaluate a function handle in other function handle
Your y_p never changes in your function. It's always the original . Shouldn't y_p be reevaluated at each step? Your 0.0001 delt...

4 days ago | 0

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Compute two matrices with different sizes and different values
it seems to me that the simplest and most reliable solution is to interpolate both velocity matrices to the same grid. Of course...

4 days ago | 0

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Answered
Error using copyfile No matching files were found.
I'd replace idx = strfind(myfile(i).name,'_thumb'); if ~isempty(idx) %do nothing else by the simpler ...

4 days ago | 0

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Answered
Extract values from a matrix
mean(yourmatrix(yourmatrix >= 3)) %mean of all values greater than or equal to 3

4 days ago | 1

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Answered
Create two fprintf in two diferent lines
You seem to be aware that '\n' is a newline so why don't you use it? fprintf('\n B1 \t B2 \t B3\t B4 \t B5\n'); %\n added a...

4 days ago | 1

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Answered
how to create an error message when invalid data is input and then prompt to re-enter the data
Typical pattern for this is: value = someinvalidvalue; while valueisinvalid value = input('Enter value'); end Note ...

5 days ago | 0

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Help with Simple OOP Program
As Thomas said, the kind of class you're developing would works better as a handle class. Note that if you derive from handle y...

5 days ago | 0

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Answered
Regionprops returning "wrong" axis lengths
That's because all the ellipse properties are not designed for hollow shapes. Matlab is trying to fit an ellipse just to the 'on...

7 days ago | 1

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Answered
Average in a 1D array
Assumming the number of elements of the vectors is a multiple of n, reshape the vector in columns of n rows and take the mean ac...

7 days ago | 1

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structure contains multiple cells with different variables in them I would like to remove variables not present in all cells
%identify common fields commonfields = fieldnames(data{1}); for cidx = 2:numel(data) commonfields = intersect(commonfield...

7 days ago | 0

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Answered
Replace letters in matrix
I would be wary of using regexprep as per Walter's code for that. It relies on the fact that replacements are attempted in the o...

7 days ago | 0

Answered
accessing large MAT file
See the limitations section of matfile to see what it can and can't do. In particular, the granularity of matfile is typically a...

8 days ago | 0

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Finding values within a matrix
It appears that you are building your code from bits you've asked or found without really understanding how it works. In particu...

8 days ago | 0

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Answered
How to parse a table (in a text file) into matlab cell array where we have some missing values?
Your file appears to have fixed width fields. the easiest way to import such files is with FixedWidthImportOptions, e.g.: opts ...

8 days ago | 0

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[Solved] How can I make my output into a 2D char array instead of separate answers?
My idea was to concatenate each line, but it doesn't seem possible without resetting Well, you're doing assignment which indeed...

11 days ago | 1

Answered
Montage from a cell array of image file names
Note that you can look at the code of montage to see what it does. As Praveen commented, it's not clear what final image size yo...

11 days ago | 0

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Answered
How to save structure inside a structure in .mat file?
If S is indeed a structure as you have defined, then save('data', 'S'); does indeed save the whole structure as one structure ...

11 days ago | 0

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Taking in a function as an argument
Seems clear enough: Error in bisekt (line 14) bisekt(m, x2) Within bisekt, you call the function again, this time...

11 days ago | 0

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Answered
while loops not work using randsample
Maybe if you used proper indenting in your code, you'd see the silliness of it: %... code irrelevant while eq1 < 1 && eq2 > 1 ...

12 days ago | 1

Answered
How to pass a method as a function handle
Can't tell you why it doesn't work as you have written, I suspect that this has to do with how the . operator is implemented in ...

12 days ago | 0

Answered
How to remove user-defined objects from memory?
Note that this has nothing to do with objects. You don't seem to be understanding cell arrays. Your B is a cell array. A cell a...

12 days ago | 1

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Answered
Concatenate cells leaving columns/rows empty
Do you mean this: c = {}; %or better if you know the final size: %c = cell(1, 3); c(1, [1 3]) = [a,b]; %put a at column 1 a...

12 days ago | 0

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