# Louise Wilson

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**Content Feed**

Question

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 ...

circa un mese 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...

circa un mese 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.

circa 2 mesi 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...

circa 2 mesi ago | 1 answer | 0

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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...

circa 2 mesi 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 ...

circa 2 mesi 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...

circa 2 mesi 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 =...

circa 2 mesi ago | 1 answer | 0

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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...

2 mesi 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...

2 mesi 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 ...

3 mesi 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...

3 mesi 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 ...

3 mesi 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...

4 mesi 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...

4 mesi 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 ...

5 mesi 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...

6 mesi 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...

6 mesi 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...

6 mesi 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 ...

6 mesi 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...

7 mesi 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=...

8 mesi 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...

8 mesi 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...

8 mesi ago | 0 answers | 0

### 0

answersQuestion

Saving matrix that contains cell arrays

Can anyone tell me the best way to save a large file that looks like this? I will be sharing it with colleagues to use in Matlab...

9 mesi ago | 1 answer | 0

### 1

answerQuestion

How to avoid Warning when assigning values to a table

Hello, I have the attached table. I create an empty table and then add each variable separately from the name of files in a fol...

10 mesi ago | 1 answer | 0

### 1

answerQuestion

Matlab is mixing MONTH and DAY up

Hello, I have a datetime array where the format is dd/MM/yyyy, but when I used ymd(), Matlab tells me that day is month and mont...

10 mesi ago | 1 answer | 0

### 1

answerQuestion

Function to use withtol but only forward in time?

I have a timetable where the rows are datetimes. I then have a second timetable and I want to match the values in the second tim...

11 mesi ago | 0 answers | 0

### 0

answersQuestion

Prevent plot() filling missing data between points

I have the plot belo where x=datenum and y=SPL. You can see, particularly in the second plot down, that there are periods where ...

12 mesi ago | 1 answer | 0

### 1

answerQuestion

Synchronize timetables with tolerance of 5 minutes

I have two tables with common information and I would like to synchronize them, creating an additional column for data from one ...

circa un anno ago | 0 answers | 0