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Louise Wilson


Last seen: 1 day ago
35 total contributions since 2019

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Question


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 ...

30 days ago | 1 answer | 0

1

answer

Question


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 ...

3 months ago | 0 answers | 0

0

answers

Question


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 ...

3 months ago | 1 answer | 0

1

answer

Question


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...

3 months ago | 1 answer | 0

1

answer

Question


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. ...

4 months ago | 1 answer | 0

1

answer

Question


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...

4 months ago | 0 answers | 0

0

answers

Question


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 ...

4 months ago | 1 answer | 0

1

answer

Question


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...

4 months ago | 1 answer | 0

1

answer

Question


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...

5 months ago | 1 answer | 0

1

answer

Question


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...

5 months ago | 2 answers | 0

2

answers

Question


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...

5 months ago | 1 answer | 0

1

answer

Question


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...

6 months ago | 1 answer | 0

1

answer

Question


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...

7 months ago | 0 answers | 0

0

answers

Question


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...

7 months ago | 1 answer | 0

1

answer

Question


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 ...

8 months ago | 0 answers | 0

0

answers

Question


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...

8 months ago | 2 answers | 0

2

answers

Question


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, ...

8 months ago | 2 answers | 0

2

answers

Answered
Reading a large csv and converting to timetable
tt.Var1=datetime(tt.Var1, 'ConvertFrom','datenum');

10 months ago | 2

| accepted

Question


Reading a large csv and converting to timetable
I have a large .csv (7179x72001) where the first column is filled with datenums and the remaining columns are numerical values. ...

10 months ago | 1 answer | 0

1

answer

Question


Why can't I convert from datenum to datetime?
I am trying to convert a vector of datenums to datetime but for some reason having issues. The spreadsheet I am working with is ...

10 months ago | 2 answers | 0

2

answers

Question


Read several large csv and store as separate variables
I have 26 large .csv files that each take a while to load in to Matlab. I would like to be able to read them all in, using one f...

1 year ago | 1 answer | 0

1

answer

Question


Make informative x-axis labels for long term spectrogram plot
I have a spectrogram which spans one month worth of 2 minute recordings. Instead of labelling each two minute recording on the x...

1 year ago | 0 answers | 0

0

answers

Question


Why do I have negative dB values after converting PSD output to dB?
I'm using acoustic data which I am in the process of producing spectrograms for. At the moment I am working with one .wav file a...

1 year ago | 0 answers | 0

0

answers

Question


I have a matrix with one column in serial datenumber format, how do I select data from a certain time period?
I have a large dataset where the first column is filled with serial datenumbers. I want to use these to select the rows of data ...

1 year ago | 1 answer | 0

1

answer

Question


How to compare contents of folders, check for missing files?
I have a folder of files, which contains .sud files and .wav files. The .wav files are decompressed .sud files and should be equ...

1 year ago | 1 answer | 0

1

answer

Question


Error when reading a csv using csvread
I am trying to read in a .csv file, which I have read in previously with no trouble. Here are my command and errors: >> A=csvr...

1 year ago | 1 answer | 0

1

answer

Question


Find specific date/time from a series of datenums
I have a 7184x72001 double matrix where the first column is a list of serial datenumbers. I am happy to keep the format this wa...

1 year ago | 2 answers | 0

2

answers

Question


Is it possible to read time stamps from photos?
I have thousands of photos, each with a time stamp identical to that above. I'd like to write a script which will automatica...

1 year ago | 0 answers | 0

0

answers

Question


How to write 2x1 string to csv?
I have created a 2x1 string array which contains filenames in the first column, and a 'yes' or 'no' in the second column. I'd l...

1 year ago | 1 answer | 0

1

answer

Question


Trying to request user input and then perform if elseif else end function...
I have a for loop which generates a figure on each loop. Based on what I see in the figure, I want my code to request a user inp...

1 year ago | 1 answer | 0

1

answer

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