# Louise Wilson

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**Content Feed**

Question

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...

13 jours ago | 0 answers | 0

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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...

14 jours 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 ...

2 mois 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...

3 mois ago | 1 answer | 0

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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...

3 mois 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...

3 mois 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 mois 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...

4 mois 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 mois 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...

5 mois ago | 1 answer | 0

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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...

5 mois 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...

6 mois 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...

7 mois 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...

7 mois 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...

8 mois ago | 0 answers | 0

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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 ...

9 mois ago | 1 answer | 0

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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 mois ago | 0 answers | 0

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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 mois 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 mois ago | 1 answer | 1

### 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 mois 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...

12 mois ago | 0 answers | 0

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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 ...

environ un an ago | 1 answer | 0

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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...

environ un an 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...

environ un an 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...

environ un an 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...

environ un an 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...

environ un an ago | 1 answer | 0

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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...

environ un an ago | 0 answers | 0

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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...

environ un an 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 ...

plus d'un an ago | 0 answers | 0