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Louise Wilson


Last seen: 1 month ago
28 total contributions since 2019

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Question


Subset a timetable to specific time period, and only include complete data for said timeperiod
I have a timetable which contains a list of filenames and a count containing information about the file: DateTime ...

2 months ago | 1 answer | 0

1

answer

Question


Subset timetable by specific time windows/periods
I have a large dataset which looks like this: The first column is datetimes and the first row is frequency bins. The data is ...

2 months ago | 0 answers | 0

0

answers

Question


Add datetime vector which contains NaT to double
I have a 2546x7200 matrix and I would like to add a vector of datetimes to the first column. The first row of the matrix is freq...

2 months ago | 1 answer | 0

1

answer

Question


Using switch case to rename files in a folder
I have a folder of .png files which have a timestamp printed on them. Unfortunately, the only metadata in the .png files is the ...

3 months ago | 1 answer | 0

1

answer

Answered
How to skip every second file in directory for for loop
The answer is... direcName = 'H:\SoundTrap\wav\New folder\*.wav'; %folder dire...

3 months ago | 1

Question


How to skip every second file in directory for for loop
I have a folder of .wav files which I am cutting to a shorter length and then re-writing. I would like to do this for every seco...

3 months ago | 1 answer | 0

1

answer

Question


How to check for gaps between datetimes in list of files in a folder?
I have a list of files in a folder which are named in datetimes of two intervals. I want to check that each file is in fact ever...

4 months ago | 2 answers | 0

2

answers

Question


Subset variable data in one .csv based on values from same variable in a second .csv
I have a large .csv file (~7GB) where the first column is filled with datetimes, and the remaining columns filled with data corr...

4 months ago | 0 answers | 0

0

answers

Question


Subset timetable based on datetime values
Hello, I have a timetable which has datetime values incrementing in ten minute intervals over a year, e.g.: DateTime ...

5 months ago | 1 answer | 0

1

answer

Question


Use retime() to create rows of empty data points
Hello, I have a dataset which looks like this: Date Time V1 V2 '29.05.2019 10:30' 1 0 '31.05.2019 08:20' 0 1...

5 months ago | 1 answer | 0

1

answer

Question


How to convert time (duration) to datetime?
In the data above, the column time shows 10:30:41 AM; 08:2007 AM etc. but the class of the variable Time is duration. I wan...

5 months ago | 1 answer | 0

1

answer

Question


Populate .csv with specific times and dates
Hello, I am looking to create a spreadsheet which has values that span a time period of interest. For example, say my data col...

5 months ago | 1 answer | 0

1

answer

Question


Calculate RMS SPL of long term acoustic data
I have a large data set of recordings which are each 2 minutes long. This data is in a matrix of dB values, where each row repre...

12 months ago | 1 answer | 0

1

answer

Question


How to use pwelch for PSD?
I would like to use pwelch to perform PSD on my long term acoustic data. The data is 120 seconds long, sampled at 144kHz. How ...

1 year ago | 1 answer | 0

1

answer

Question


How to calculate PSD estimate of acoustic data in 1Hz bins? pwelch?
Hi everyone, I have several files of 118.5 second duration that I would like to calculate the PSD of. I want to do this in 1Hz...

1 year ago | 0 answers | 0

0

answers

Question


Basic fir1 question-what is N?
HI everyone, I am working through code from a colleague (retired) and slowly interpreting what everything means as I learn matla...

1 year ago | 1 answer | 0

1

answer

Question


How to change the working directory as code progresses...
Hi all, I have two functions that I would like to run on a folder of files. The first 'GetFrames(x)' takes a folder of .avi fil...

1 year ago | 1 answer | 0

1

answer

Question


Burn Grid onto a Series of Images
Hi all-I have a lot of image files and onto each I am trying to place a grid. I'd like to save the grid onto the file, and so pr...

1 year ago | 1 answer | 0

1

answer

Question


Batch process AVI files into PNG/JPG
Hi all, I am working with a large dataset of .avi files which I need to split into .png for further analysis. From previous que...

1 year ago | 1 answer | 0

1

answer

Question


Faster way to draw bounding box around object in an image?
Hi everyone, I am new to Matlab and this is my first attempt at image processing. I want to count the number of boats in a larg...

1 year ago | 0 answers | 0

0

answers

Question


How to ensure my times will follow daylight savings?
Hi everyone, I am working on a piece of code which will allow me to reduce a dataset, and part of this requires converting sepa...

1 year ago | 2 answers | 0

2

answers

Question


How to convert column datetime to datenum?
HI everyone, I have a .csv file with a datetime column, in the format 'yyyy/m/d hh:mm:ss', for example: '2019/5/2 10:21:25'. S...

1 year ago | 1 answer | 0

1

answer

Question


Apply Function to a Variable in Timetable
Hi everyone, I have been using the 'rowfun' helpfile but I can't get this to work. https://au.mathworks.com/help/matlab/ref/ro...

1 year ago | 1 answer | 0

1

answer

Question


For Loop: How to add string to matrix?
Hi everyone, I am new to Matlab, and I think I am on my way with this first problem but having a few issues. Here is what my o...

1 year ago | 0 answers | 0

0

answers

Question


Convert Date to DATENUM format
Hi everyone, I have a .csv file with a list of dates in column 3 which I would like to convert to datenum format. I'm new to m...

1 year ago | 1 answer | 0

1

answer

Question


For Loop Dimensions Not Consistent Horzcat
Hi everyone, I am new to Matlab and working through code I have found to understand each step. You can see my comments describi...

1 year ago | 1 answer | 0

1

answer

Question


Bandpass Filter BPFILT-Does this function still exist?
I have some code that uses bpfilt to apply a bandpass filter from 10 - 100 (presumably kHz): flo=10; fhi=100; ...

1 year ago | 1 answer | 0

1

answer

Question


Writing Code for Identifying Objects in a Photo
Hello, I am new to Matlab but I want to learn how to write code which will enable me to analyse thousands of photos. The photos ...

1 year ago | 1 answer | 0

1

answer