Louise Wilson
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Awarded to Louise Wilson on 09 Oct 2019
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Different outputs from spectrogram and pwelch
There was a mistake in my code which I have now rectified. The results for the spectrogram and spectra now match.
mehr als ein Jahr vor | 0
| akzeptiert
Frage
Different outputs from spectrogram and pwelch
When analysing an acoustic signal, I would expect to get the same results presented in a spectrogram or a PSD analysis, when usi...
mehr als ein Jahr vor | 2 Antworten | 0
2
AntwortenFrage
Welch's PSD estimate
I'm trying to work out why two different ways of doing a single-sided PSD analysis yields different results. As far as I can tel...
mehr als ein Jahr vor | 1 Antwort | 0
1
AntwortFrage
Explanation of surf plot
I used the following code to plot some example data: A(1,1:51)=0:1:50; A(2,2:51)=1; A(3,2:51)=2; A(4,2:51)=3; A(5,2:51)=4; ...
mehr als ein Jahr vor | 1 Antwort | 0
1
AntwortFrage
Quickest way to do a bandpass filter?
I have a huge dataset of .wav files that I would like to bandpass filter. Is the following the most time efficient way to do i...
etwa 2 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Matlab using up computer memory
I am working with large datasets in Matlab 2022a, on MacOS Monterey 12.2.1. Each time I run Matlab, my memory goes down, even t...
etwa 2 Jahre vor | 2 Antworten | 0
2
AntwortenFrage
Filling missing times in timetable with NaN using retime
I am trying to create rows in a timetable for days where data is missing. I have the attached table as an example. Can anyone e...
mehr als 2 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Creating a map using x/y data
I have X, Y, Z data where X and Y are lon and lat coordinates and Z is value of interest. All variables are 12500*1800 (too larg...
fast 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Add geographic data to pcolor plot
Can anyone advise me as to how I can add geographic information to a pcolor plot? Each of the variables I have is a 12500x800 ...
fast 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Adding datetime to spectrogram x axis
I have six acoustic files which were recorded consecutively. I have concatenated the data and shared it here: https://drive.go...
etwa 3 Jahre vor | 1 Antwort | 0
1
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Plot spectra and spectrogram of acceleration data
I have acceleration data for three planes (X,Y,Z) which is recorded using an accelerometer connected to a recorder (referred to ...
etwa 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Mean of multidimensional array
I have a multidimensional array: 1000x72x4. I would like to know the mean of all four sheets and so provide a single 1000x72 ma...
etwa 3 Jahre vor | 1 Antwort | 0
1
AntwortChange projection of netcdf data and convert from UTM to lat/lon
I have since realised that it is not logical to modify the spatial data in this way as it would break the regularity.
etwa 3 Jahre vor | 0
| akzeptiert
Frage
Interpolation(?) of 3D array
I have a 3D array (vardata) which contains sound pressure level data at a series of lat/lon coordinates for 91 different frequen...
etwa 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Change projection of netcdf data and convert from UTM to lat/lon
I have a netcdf file vardata=ncread('TL__Map1_15C_sand1__20mres_-36.265137N_174.790466','TLdata'); ncdisp('TL__Map1_15C_sand...
etwa 3 Jahre vor | 2 Antworten | 0
2
AntwortenFrage
Convert UTM to lat lon
I have a 290x480x90 array where the x and y are coordinates in UTM. I'd like to convert them to degrees minutes seconds and I'd ...
etwa 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Accessing (interpolating?) data in 3D array
I have been using Matlab for many years but this is my first time working with a 3D array. My data is 290x480x90 in the format l...
etwa 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Convert from linear to log scale and back again
I have include some example data. %fit curve [xData, yData] = prepareCurveData(log10(plot_data.xdata), plot_data.ydata); ft =...
etwa 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Reading and visualizing netcdf with vectors of differing lengths
This is my first time reading netcdf data. I can read the file and variables of interest as follows: vardata=ncread('TL__Map1_1...
etwa 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Datetimes don't seem to be recognised
Can anyone explain to me why this isn't working? For some reason, the datetime t is not recognised as occurring between times.t1...
mehr als 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Exclude certain dates on x-axis using xlim or xtick?
I have attached my dataset and a plot to illustrate what I am trying to do. I would like to remove the blank spaces between the ...
mehr als 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Can you exclude dates in date range using xlim?
I have a dataset where the x axis is time and the y axis is sound pressure level in dB. The data is recorded continuously on a 2...
mehr als 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Discrepancy between datenum and datetime?
I am trying to plot some data (attached) . The figure wasn't displaying the data I knew I had, so I tried again using datetime ...
mehr als 3 Jahre vor | 2 Antworten | 0
2
AntwortenFrage
Data, which isn't missing, appears to be missing in surf plot
Can anyone explain the gaps (white bars) which arise in my surf plot? The degree to which they appear changes depending on wheth...
mehr als 3 Jahre vor | 0 Antworten | 0
0
AntwortenFrage
Plotting spectrograms for multiple files
I have multiple acoustic files for which I would like to plot a spectrogram on a single plot. I know how to plot one spectrogr...
mehr als 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Align two signals using cross correlation
I have two four channel recorders and a total of six microphones. Since the time lag between the two recorders is ~5 seconds, I ...
mehr als 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Is it possible to write an 'empty' cell in Matlab, not NaN?
I would like to write an empty cell in an output file which I will save as a .bty file. The attached file is an example. In th...
mehr als 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
How to plot successive rows of a table when value is true
I have attached an example data set. What I would like to do is plot successive rows together if the time between successive row...
mehr als 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
How to chose the correct line style?
I have created the attached plot. I have a large dataset with multiple entries, each representing different moving objects. I wa...
mehr als 3 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Error/fault in code, 'Unrecognized function or variable'
I have the following loop within my script. The intention is to process thousands of files within a folder through the function ...
mehr als 3 Jahre vor | 1 Antwort | 0
1
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