# Louise Wilson

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**Content Feed**

Question

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...

3 months ago | 1 answer | 0

### 1

answerQuestion

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...

3 months ago | 2 answers | 0

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answersQuestion

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...

6 months ago | 1 answer | 0

### 1

answerQuestion

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...

12 months ago | 0 answers | 0

### 0

answersQuestion

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 ...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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 ...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerChange 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.

1 year ago | 0

| accepted

Question

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 2 answers | 0

### 2

answersQuestion

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 ...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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 =...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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 ...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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 ...

1 year ago | 2 answers | 0

### 2

answersQuestion

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...

1 year ago | 0 answers | 0

### 0

answersQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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 ...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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 ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Subset using time range following specific time

I have two tables (see attached screenshot.) Both tables have a list of datetimes. I want to select the value from counts_subset...

2 years ago | 1 answer | 0

### 1

answerQuestion

readtable working differently for different files

I have a bunch of spreadsheets which all have the same format. However, when I read them in, they appear differently... folder=...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to fit a log curve to a scatterplot?

Could anyone advise me on how to a fit a curve to this plot? The y-axis is decibels and so logarithmic. I have tried the hel...

2 years ago | 1 answer | 0

### 1

answerQuestion

Is it possible to retrieve data from a website?

I have a list of vessel MMSI numbers. I would like to take each, enter it into the search bar on this page 'https://www.vesselfi...

2 years ago | 1 answer | 0