# Louise Wilson

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**Content Feed**

Question

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 ...

alrededor de 2 meses ago | 1 answer | 0

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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...

alrededor de 2 meses 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...

2 meses 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...

2 meses 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 ...

3 meses 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...

3 meses 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=...

4 meses 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...

4 meses 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...

4 meses ago | 0 answers | 0

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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...

5 meses 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...

6 meses ago | 1 answer | 0

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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...

6 meses 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...

7 meses 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 ...

8 meses 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 ...

10 meses ago | 0 answers | 0

### 0

answersQuestion

Aligning axes of two plots, one categorical axis, one datetime axis

I have the following figure. As you can see, the x axes of the bottom two plots are perfectly aligned. These axes are datetime ...

11 meses ago | 1 answer | 0

### 1

answerQuestion

How to use boxchart()?

I am trying to use a boxchart for the first time as opposed to a boxplot, as it looks to have better functionality for what I wa...

11 meses ago | 1 answer | 0

### 1

answerQuestion

Read in specific range of large .csv

I have very large .csv files that I am trying to work with, e.g. 7000 * 72000. In each file the first column is a time vector. ...

11 meses ago | 1 answer | 0

### 1

answerQuestion

Generalized linear models in Matlab

After learning to use Matlab this year to process and visualise large databases of acoustic data, I am now looking to do some st...

11 meses ago | 0 answers | 0

### 0

answersQuestion

Align time axes of two plots?

I have two figures where the x-axis is time, and they overlap in time. One is a spectrogram of a sound file and the other shows ...

11 meses ago | 1 answer | 0

### 1

answerQuestion

How do select values in one table which match those in another...

I have two tables which look like the following. Where the MMSI number in column one of IMO_file matches Var4 in AISfile, I want...

12 meses ago | 1 answer | 0

### 1

answerQuestion

Streamline for loops and indexing of large files

I am wondering if anyone has any advice on how I could streamline a script I am working on. The purpose of a script is to subse...

12 meses ago | 1 answer | 0

### 1

answerQuestion

Read one column only of a large file, line by line?

I have a large table e.g. 7836x72001. I am interested in extracting the first column from the table which is a vector of datenum...

12 meses ago | 2 answers | 0

### 2

answersQuestion

Fast subsetting or indexing of data

I am working with large datasets which I am subsetting into various categories and saving as smaller files. What I am doing righ...

12 meses ago | 1 answer | 0

### 1

answerQuestion

Find last row of csv contents using fopen, fgetl?? Or, another way?

Hello, I have a large csv ~350,000 rows, which contains a lot of information I don't need. The purpose of my script is to extrac...

alrededor de 1 año ago | 1 answer | 0

### 1

answerQuestion

Error: Warning: The end of file was reached before the requested samples were read completely. Total number of samples read is 15138816.

I am getting an error which says that the file I am reading is too short to read the requested number of samples. However, I kno...

alrededor de 1 año ago | 0 answers | 0

### 0

answersQuestion

Subset timetable based on variable value using cell format

I have a timetable which looks like this: I would like to subset the timetable based on the values of the variables DayName,T...

alrededor de 1 año ago | 1 answer | 0

### 1

answerQuestion

How to subset common datetimes from multiple timetables

I have five timetables which contain data for five locations across a common time period. I have presented these in a histogram ...

alrededor de 1 año ago | 0 answers | 0

### 0

answersQuestion

How to count number of days within datetime array

I have a timetable which spans a year. The intervals between the datetimes varies from one minute to ten minutes. I am intereste...

alrededor de 1 año ago | 2 answers | 0

### 2

answersQuestion

Randomly select one file, every 10 files, and randomise where you take that file from

I have a database of thousands of .wav files which I am looking to subset. For every 10 files, I would like to select one file, ...

alrededor de 1 año ago | 2 answers | 0