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Guillaume


University of Brighton

7 306 total contributions since 2012

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Answered
Counting consecutive repeat values for each row in matrix
It's a job for the image processing toolbox, in particular bwconncomp (with a custom connectivity): cc = bwconncomp(~yourphoto,...

ungefär 4 timmar ago | 1

Answered
Calculate connected graph components of "merged graphs" (graph union)
Assuming you want that identical nodes are nodes with the same X and Y coordinates, then first I'd add these coordinates to the ...

ungefär 12 timmar ago | 1

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Answered
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...

ungefär 15 timmar ago | 0

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Using strrep for matrix
Keeping your 2d character array as is: yourarray(ismember(yourarray, 'hood', 'rows'), :) = []; or yourarray(all(yourarray == ...

en dag ago | 0

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How to check whether any two elements are equal or not in a Nx1 array in matlab?
x = [1 2 3 4 2 5 6 3 7 8 9 10]; %demo data. Works with column or row vectors [loc1, loc2] = find(tril(x == x.', -1)); %loca...

en dag ago | 2

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Answered
Average of two consecutive rows and importantly average of first and last row.
You have to be careful with the terminology you use. structures aren't tabular, they don't have columns and rows (well, they can...

en dag ago | 0

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Strip comments from code read from file identifier
The only way to do this is to write a parser that can parse whichever language you're planning to support. At the very least, yo...

en dag ago | 0

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...

2 dagar 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)...

2 dagar 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...

2 dagar ago | 1

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Answered
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 =...

2 dagar 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...

3 dagar 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...

4 dagar 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...

4 dagar 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...

5 dagar ago | 0

Answered
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...

6 dagar 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 ...

6 dagar 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

6 dagar 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...

6 dagar 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 ...

6 dagar ago | 0

Answered
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...

6 dagar 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...

8 dagar 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...

8 dagar 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...

8 dagar 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...

9 dagar ago | 0

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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...

9 dagar ago | 0

Answered
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...

9 dagar 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 ...

10 dagar 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...

12 dagar 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...

12 dagar ago | 0

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