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Sepp


Active since 2014

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Visualizing speed and acceleration of typing (smartphone keyboard)
Hello everybody I have a dataset of smartphone keyboard recordings. Each sample consists of the pressed key on the keyboard (e...

5 years ago | 0 answers | 0

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answers

Question


Heat map visualizing touch pressure on smartphone in x-y space
Hello everybody I have a dataset where each sample consists of x- and y-position, timestamp and a pressure value of touch inpu...

5 years ago | 1 answer | 0

1

answer

Question


AUC for multiclass classification
Hello everybody Let's assume that we have a classification problem with 3 classes and that we have highly imbalanced data. Le...

6 years ago | 0 answers | 0

0

answers

Question


Too high correlation value from xcorr and corrcoef for uncorelated sequences
Hello I have two time series both of length 5604. The data is in the attachment (data.csv). The first column is the first tim...

6 years ago | 2 answers | 0

2

answers

Question


P-value of cross-correlation
Hello everybody I have two time series Xa and Ya from which I'm calculating the cross-correlation vm2 in Matlab in the follow...

6 years ago | 2 answers | 0

2

answers

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Investigating correlation for unequal signal lengths
Hello everybody I have measurements from two tablet sensors. The first sensor measures the touch pressure applied to the tabl...

6 years ago | 1 answer | 0

1

answer

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Which stasticial test is best to use in my case?
Hello I've conducted an experiment with around 100 people. I have 48 male and 52 female. Now I would like to accept or reject...

6 years ago | 1 answer | 0

1

answer

Question


Creating legend for scatter plot
Hello I have created a scatter plot in the following way: arousal = [1, 9, 2, 5, 6, 8, 3, 2]; correctness = [1, 0...

6 years ago | 1 answer | 0

1

answer

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Saving math task as image using LaTeX
Hello I would like to generate varying math tasks with Matlab and save them as a .png image using LaTeX. For eaxmple, a task ...

7 years ago | 0 answers | 0

0

answers

Question


Normalizing cross-correlation to [-1,1] for different length signals
Hello I have the following piece of code for calculating the cross-correlation between to signals. Visually, the signals are ...

7 years ago | 0 answers | 0

0

answers

Question


Correlation of shifted time-series
Hello I have two time series with different sampling rates. I can apply interpolation to correct for the different sampling r...

7 years ago | 0 answers | 0

0

answers

Question


Dividing fourier transform by factor n
Hello everybody I have a problem with the fast fourier transform. I would like to extract the low and high frequency power of...

7 years ago | 1 answer | 0

1

answer

Question


Passing variable sized arguments to a method
Hello I'm using the PrintTable method of the <https://ch.mathworks.com/matlabcentral/fileexchange/52299-kermor-matlabtools ma...

7 years ago | 1 answer | 0

1

answer

Question


Visualization of standard deviation in scatter plot
Hello I have a 2-d scatter plot in Matlab. Let's assume the following scatter plot: x = linspace(0,3*pi,200); y =...

7 years ago | 0 answers | 0

0

answers

Question


Vertical lines with text in plot
Hello everybody I have created a plot in Matlab. Let's assume for simplicity that I have the following plot: x = 0:pi/10...

7 years ago | 2 answers | 0

2

answers

Question


Low-pass filter in Matlab / Python for removing movement noise
Hello I'm recording a signal (skin conductance) over time, i.e. I have a time series. Unfortunately, the signal is affected b...

7 years ago | 2 answers | 0

2

answers

Question


Calculating correlation of different time series
Hello I have several time series, i.e. I have measured a couple of signals over 15min. Each signal is sampled several times e...

7 years ago | 1 answer | 0

1

answer

Question


Setting time ticks in plot
Hello I have made a Matlab plot based on a data vector. On the x-axis should be the time and on the y-axis the value. For eac...

7 years ago | 2 answers | 0

2

answers

Question


Analysis of ROC and Precision-Recall curve
Hello I have run some machine learning experiments and now I have created some ROC and Precision-Recall curves (with the help...

8 years ago | 0 answers | 0

0

answers

Question


Matlab TreeBagger OOBPrediction flag not recognized
Hello I'm using the TreeBagger function of Matlab R2015a with the name-value pairs 'OOBPrediction', 'on' and 'OOBPredictorImp...

8 years ago | 1 answer | 1

1

answer

Question


Specificity for multiple-class classification
Hello have read the paper "A systematic analysis of performance measures for classification tasks" in which different statist...

8 years ago | 0 answers | 0

0

answers

Question


How to calculate normalized euclidean distance on two vectors?
Hello Let's say I have the following two vectors: x = [(10-1).*rand(7,1) + 1; randi(10,1,1)]; y = [(10-1).*rand(7,1) + 1;...

8 years ago | 1 answer | 0

1

answer

Question


Matlab: Error in copied and renamed function
Hello I'm using the ga() function of Matlab for parameter optimization in the following way: options = gaoptimset('Cross...

8 years ago | 1 answer | 0

1

answer

Question


Sampling according to difference in function value
Hello I have 20 values x1,...x20. Each value is between 0 and 1, for example 0.22,0.23,0.25,... x = rand(20,1); x = s...

8 years ago | 1 answer | 0

1

answer

Question


Deriving integer and continuous values from Temperature (Simulated Annealing)
Hello I would like to use the technique related to Simulated Annealing for my problem. Let's say I have an initial temperatur...

8 years ago | 0 answers | 0

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answers

Question


How can I cluster data points according to the local minima they belong to?
Hello I'm using the genetic algorithm for hyperparameter optimisation. My loss function is the cross-validated loss, that mea...

8 years ago | 2 answers | 0

2

answers

Question


How can I compute statistical significance with cross-validation?
Hello I've done nested cross-validation with 10 outer runs and 10 inner runs to evaluate different classifiers. In the end I ...

8 years ago | 0 answers | 1

0

answers

Question


Initial Temperature for Simulated Annealing
Hello I'm trying to use simulannealbnd for parameter optimization. My big problem is the initial temperature T0. The default ...

8 years ago | 0 answers | 0

0

answers

Question


Prior probability for classifiers
Hello In the fitcsvm method for training a SVM classifier one can set the prior for each class with the 'prior' flag. For mos...

8 years ago | 0 answers | 1

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answers

Question


Improving Nelder-Mead Optimization by Genetic Algorithms and Simulated Annealing concepts
Hello I'm using the Nelder-Mead simplex algorithm for hyperparameter optimization. It works quiet well but now I would like t...

8 years ago | 2 answers | 0

2

answers

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