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# Cedric Wannaz

##### Last seen: 26 jours ago
849 total contributions since 2013

General interest: interdisciplinary approaches to complex problems (in particular mixing Mathematics, Physics, and Computer science).

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extract data from EEG text file
Using the data text file that you provided elsewhere (renamed and attached to this answer), here is a short example of one way t...

10 mois ago | 1

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How to sum repeated adjacent values in a vector
Here is one way: Y = splitapply( @sum, X, [0, cumsum( diff(X) ~= 0 )] + 1 ) ; or, split into two expressions that make it easi...

10 mois ago | 1

Comparing Data sets with same numbers of Array
As you have no N-NE direction, here is an example for SE-S: dayId = [1, 5, 10, 15, 50, 60, 92] ; cat_sub = cat_wind_direct...

10 mois ago | 0

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How do I extract points from multiple circles?
We cannot test without your data, but the approach seems fine. You could use the PDIST2 function and extract everything in one s...

10 mois ago | 1

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python with matlab, undefined variable py?
Try going through: https://www.mathworks.com/help/matlab/matlab_external/undefined-variable-py-or-function-py-command.html and ...

11 mois ago | 0

How to write cell array into a csv file
To write the data in C to a CSV file. Use “writetable” in combination with the “cell2table” function. % Convert cell to a tabl...

environ un an ago | 22

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How to slice each string in a string array without using for loop
If you favor performance over readability/maintainability, you can build an approach around the following: buffer = vertcat(...

plus d'un an ago | 4

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How to retrieve z value from surf plot given x and y?
Interpolate with |INTERP2| : <https://www.mathworks.com/help/matlab/ref/interp2.html> where |Xq| and |Yq| are defined using t...

plus d'un an ago | 0

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Writing a loop to calculate a seasonal cycle and then plot the seasonal cycle?
Where is |t| defined? In addition, |month_mean| is your intermediary variable; you want to plot either |seasonal_cycle| or |s_cy...

environ 2 ans ago | 0

How to read large text data into matlab
If you have enough RAM for this, the following could run a little faster. It is way less versatile than Per's solution though, a...

environ 2 ans ago | 1

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How can I create a matrix with the values of the elements is a function of the indices?
Not sure that I understand. If you wanted to create a rectangular array whose elements are a the result of some arithmetic opera...

environ 2 ans ago | 0

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Strfind to contain complex pattern
Here is an approach: str = 'John played volleyball. I love Anna. Are you there?' ; buffer = strtrim( strsplit( str, {'....

environ 2 ans ago | 0

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Rearrange cell content by groups
Hi |dpb|, Assuming that you have a cell array (and that you are using this _table type of output_ just for a _display purpose...

environ 2 ans ago | 0

Question

Solving A{k} * x + b = 0 for large numbers of A{k} with same structure/filling.
Dear all, &nbsp;&nbsp;I am trying to improve the efficiency of solving |A{k}*x+b=0| for |x|, that I currently solve using the...

environ 2 ans ago | 2 answers | 0

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Question

Should I (and how to) avoid "forests" of listeners in nested OOP structure.
Dear all, &nbsp;&nbsp;&nbsp;I never used more than the basics of events and listeners, and I could benefit from the input of ...

environ 2 ans ago | 0 answers | 0

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Question

Dynamic superclass name in call to superclass method.
Dear all, &nbsp;&nbsp; In a particular context, I could benefit from being able to use _"dynamic superclass naming"_ in calls...

environ 2 ans ago | 0 answers | 2

### 0

Question

Error management in OOP framework.
Dear all, &nbsp;&nbsp;&nbsp;I am trying to implement an error management mechanism that allows building very detailed error r...

environ 2 ans ago | 1 answer | 1

### 1

How to vertcat 100 matrices ?
If they are stored in cell array |M|: Mvcat = vertcat( M{:} ) ; where |M{:}| is what we call a _comma separated list_ (CS...

plus de 2 ans ago | 1

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print leading and trailing zeros into text file
>> dec2hex(195112160, 8) ans = '0BA12CE0'

plus de 2 ans ago | 0

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Finding and saving identical rows in a matrix
Alternatively: [~, ~, ic] = unique( A(:,1:2), 'rows' ) ; groups = splitapply( @(x){x}, A, ic ) ; produces groups = ...

plus de 2 ans ago | 1

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How extract sub matrix without zeros from a big matrix
Here is an example; we first build a test data set: >> N = randi( 10, 10, 4 ) ; >> for k = 1 : 10, N(k,1+randi(3,1):end) =...

plus de 2 ans ago | 0

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How to remove repeating elments from a matrix?
Almost, the idea was correct but you were not working on the correct dimension. Also, sorting the input array vertically makes c...

plus de 2 ans ago | 0

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sum of matrix omitting one dimension
Here is one way, but there is probably a simpler approach: buffer = arrayfun(@(k) permute(KL, circshift(1:ndims(KL), k-1)), ...

plus de 2 ans ago | 0

Split array into cell arrays of different size
>> seqs = mat2cell( A, 1, diff( [strfind(A, [5,19]), numel(A)+1] )) seqs = 1×5 cell array {1×4 double} {1×3 doub...

plus de 2 ans ago | 0

Find if two sparse matrix have 1 in same position
Do you need something along this line? % - Build small test case. A = sprand( 4, 5, 0.5 ) > 0 ; % 4x5 sparse. B =...

plus de 2 ans ago | 0

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How to import Text File with 2 different Delimiters (how to organize header data and numeric data)
You may not need to use header information for parsing your file. Look at this example (applied to |data.txt| attached): ...

plus de 2 ans ago | 0

Any tips for bsxfun and repeated calculation?
If you have MATLAB R2016b or above, BSXFUN was replaced by automatic expansion and you can do it as follows: >> D = repmat( ...

plus de 2 ans ago | 0

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sum along data with different steps
Interestingly, the following seems to produce what you are looking for: >> expandSum = @(x,n) sum(reshape(cell2mat(arrayfun(...

plus de 2 ans ago | 1

| accepted