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Cedric Wannaz


Last seen: 9 dagen ago
855 total contributions since 2013

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

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Answered
how is imwrite() in Matlab2020a saving RGB?
You are saving as a jpeg file, which is lossy by default. If you save as .png for example (lossless), there will be no differen...

4 maanden ago | 0

Answered
Can't call function within class
You forgot to bracket the output args, and the semi-column is useless: function [resamp_x,resamp_y] = resamp_sig(obj)

4 maanden ago | 0

| accepted

Answered
Matlab: Select a variable name and find the corresponding value
Here is one way: content = fileread( 'myTextFile.txt' ) ; match = regexp( content, '(?<=\$_Wk1_lr_m,\s+str\s*=\s*''\s*)[^\s'...

4 maanden ago | 0

| accepted

Answered
video in a figure
The reason is indicated in the doc: "The movie function uses a default figure size of 560-by-420 and does not resize figures to ...

5 maanden ago | 0

Answered
I have been getting error 377 for weeks now. How do I fix this issue?
You could follow the instructions for manual activation provided in the thread referenced in this answer.

5 maanden ago | 0

Answered
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...

meer dan een jaar ago | 1

| accepted

Answered
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...

meer dan een jaar ago | 1

Answered
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...

meer dan een jaar ago | 0

| accepted

Answered
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...

meer dan een jaar ago | 1

| accepted

Answered
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 ...

meer dan een jaar ago | 0

Answered
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...

meer dan een jaar ago | 22

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Answered
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(...

bijna 2 jaar ago | 4

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Answered
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...

bijna 2 jaar ago | 0

| accepted

Answered
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...

meer dan 2 jaar ago | 0

Answered
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...

meer dan 2 jaar ago | 1

| accepted

Answered
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...

meer dan 2 jaar ago | 0

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

meer dan 2 jaar ago | 0

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Answered
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...

meer dan 2 jaar 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...

meer dan 2 jaar ago | 2 answers | 0

2

answers

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 ...

meer dan 2 jaar ago | 0 answers | 0

0

answers

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...

meer dan 2 jaar ago | 0 answers | 2

0

answers

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...

meer dan 2 jaar ago | 1 answer | 1

1

answer

Answered
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...

bijna 3 jaar ago | 1

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

bijna 3 jaar ago | 0

| accepted

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

bijna 3 jaar ago | 1

| accepted

Answered
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) =...

bijna 3 jaar ago | 0

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Answered
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...

bijna 3 jaar ago | 0

| accepted

Answered
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)), ...

bijna 3 jaar ago | 0

Answered
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...

bijna 3 jaar ago | 0

Answered
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 =...

bijna 3 jaar ago | 0

| accepted

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