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Butterflyfish


Last seen: 2 days ago |  Active since 2013

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Tracking motion of particles: using edge detection and blob analysis?
Hi, I would like to track particles in a stack of 500 images (451 x 191 x 500). The raw images look like this: I would like...

5 months ago | 1 answer | 0

1

answer

Question


Timer with very precise period time
I have a script that plays a sound every 15 minutes a given number of times. It is triggered at a given datetime. As I would lik...

3 years ago | 1 answer | 0

1

answer

Question


Wait until user press return key to continue script
I have a script plotting a figure with some vertical lines. I then want the user to select some of the lines and output a table ...

3 years ago | 2 answers | 0

2

answers

Question


Select lines on a surf plot and output indices
I have a plot (spectrogram) on which I added some lines. I would like to select some of these lines directly on the plot with th...

3 years ago | 1 answer | 0

1

answer

Question


Display both the figure and save the output in the function 'findchangepts'
I am using the function findchangepts to find abrupt changes in a spectrogram: [s,f,t,pxx] = spectrogram(data, 128, 120, 128, f...

3 years ago | 1 answer | 0

1

answer

Question


Coloring scatter plot based on count number
Hi, I have a table (results) with time as a first column (result.time) and the count of an event in the second (result.event). ...

3 years ago | 1 answer | 0

1

answer

Question


Define an event if there are > 5 signals detected in a minute
I have a datetime table containing detected 'signals' and their variables, including their exact timestamps. I would like to d...

3 years ago | 1 answer | 0

1

answer

Question


Sound source localization underwater
I have three recordings of a signal taken with an array of three hydrophones (one sound source). I would like to estimate the so...

4 years ago | 1 answer | 0

1

answer

Question


Detect abrupt change in trajectory (coordinates)
I have a trajectory (cartesian) on a timeline (frames) and I need to find abrupt changes in trajectory, i.e. almost 180º. I foun...

4 years ago | 1 answer | 0

1

answer

Question


Animated Line: display different colours and leave the colourful trail
I have a trajectory which I would like to animate with the colour changing depending on a condition. Here is my script so far: ...

4 years ago | 0 answers | 0

0

answers

Question


Randomly select a set number of samples (of size n) without overlap, nor replacement, in a signal
I have a sound signal and I would like to randomly select 5 units of 10 seconds in that signal, but with no overlap, and with no...

5 years ago | 1 answer | 0

1

answer

Question


Transforming HH:mm:SS to 'dd.MM.yy HH:mm:SS' and loosing seconds
>> time = datestr(seconds(duration),'HH:MM:SS') time = '02:59:57' >> date_and_time = datetime(time, 'ConvertFrom', 'dat...

5 years ago | 1 answer | 0

1

answer

Question


Cut an audio file into regularly spaced units
Hi, I would like to cut long audio files into regularly spaced units of regular size, and save these units as new audiofiles. ...

5 years ago | 1 answer | 0

1

answer

Answered
How can I Install POI library on Mac?
In your Matlab code, add: addpath('/dir/20130227_xlwrite/poi_library') javaaddpath('poi_library/poi-3.8-20120326.jar...

6 years ago | 0

Question


How to import and read a binary file in Matlab
I have a .bin file with data which was saved as '16-bit, Intel format with no header'. Is it possible to import and read and if ...

7 years ago | 1 answer | 0

1

answer

Question


Change the folder names from one digit to 2 digit numbers
I have a folder 'data' full of folders which are named like this: E:\data\foldername1\ E:\data\foldername2\ E:\data\f...

8 years ago | 1 answer | 0

1

answer

Question


FFT, padding, IFFT and plot in time domain
Hi, I performed an FFT with some zero padding and would like to transform it back to time domain. When I plot the signal it look...

9 years ago | 0 answers | 0

0

answers

Question


Find and plot 3dB and 6dB downpoints of spectral peak frequency in a PSD
I have a PSD and find its peak with: Pyy, fyy]= periodogram(filterLow_hyd1,[],[],fs); [pk, loc] = findpeaks(Pyy,'Npeaks',1...

9 years ago | 1 answer | 0

1

answer

Question


Spectrogram: find the median of the power (dB) to plot with median threshold
I have a spectrogram: [s,w,t] = spectrogram(signal,blackmanharris(windLength),overlap,NFFT,fs,'yaxis'); and I want to plo...

9 years ago | 0 answers | 0

0

answers

Question


Combining and averaging multiple FFTs
I have multiple, real, audio signals which I am taking the FFTs. Although they don't come from the same recording, those signals...

9 years ago | 1 answer | 2

1

answer

Question


Add a semilogx axis to a plot given by a function
I am using the function obw() to plot occupied bandwidth with the code: obw(signal, fs); It plot it on a normal frequenc...

9 years ago | 1 answer | 0

1

answer

Question


Newbie: How can I import and read data files (text files) automatically?
I would like to import data into a m file. Data has extension ".epi". I figured out how to import it (see code following) but w...

11 years ago | 1 answer | 0

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