# Peter Perkins

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**Content Feed**

Line of Best Fit for a time series plot

There are a bunch of things you might mean by this, but here's one thing you might do. % set up random data Time = datetime(19...

2 giorni fa | 0

Direct calculations on tables - elementwise mean of n-tables

If I understand your situation correctly, data{1:end} is a "comma-separated list" of tables, and so mean(data{1:end}) in effect ...

4 giorni fa | 0

How can I compress a table

Here's another possibility, using rowfun, that returns a table containing tables, which maybe is easier to use than what you ask...

4 giorni fa | 1

Help with graphing table into line graph

This spreadsheet is kind of messed up, and I will let you figure out how best to read it in. Given that, it seems like stackedpl...

5 giorni fa | 0

How to finding GAPS in satellite access times.

There are ways to do this without loops, but the most straight-forward way (assuming the data are sorted by start time) is brute...

6 giorni fa | 0

Index and select rows from table

"I need to split the original data based on the categories of col5." You probably do not want/need to do that. Take a look at t...

6 giorni fa | 0

how can I get a list of the countries used by the mapping toolbox as a cell array?

Stephen seems to have answered your question, but also, you will find categorical useful for cleaning your data: countryList = ...

6 giorni fa | 0

I have a problem with my script. I would like to extract pH data from the coast of Cameroon or the Gulf of Guinea. Can I have some ideas on what is bugging my script and a cor

Using datenums is no longer recomended. t1=double(ncread([PathName,FileName],'TIME')); ... t(i)=datenum(1900,1,1,0,0,0...

6 giorni fa | 0

Change of frequency content after using the retime function

Julius, I'm definitely not any kind of signal processing expert, but I think what you want is resample, from the Signal Processi...

16 giorni fa | 0

Sampling and Filtering Table Data

Presumably you would have a timetable. If you have the Signal Processing Tbx, you should look at resample.

16 giorni fa | 0

How can I align deterministic signals?

Some of what SS shows might be easier with timetables: for i = 1:4 signal = load("ew_data"+i+".mat"); signal = signal.ans;...

17 giorni fa | 1

My exported EDF file is up to 100 times bigger than my imported EDF file

I don't know much about EDF, and there's no fil attached, but my guess is that the culprit is Voltage_V = vertcat(Data.EEG{:});...

23 giorni fa | 0

Plotting bar graph from website

Marcus, it looks to me like what you have is a year-by-month array. As others have said, those bars are mightily thin. Have you...

23 giorni fa | 0

Trouble with date conversion

Worth saying that if the file was a spreadsheet and contained things like 20230101 as numeric values, there's a conversion for t...

23 giorni fa | 1

How to get columns as 'struct' in timetable

Ludo, I'm not 100% sure I follow your question, but lemme take a shot. As Stephen shows, a variable in a table can be a struct ...

23 giorni fa | 1

How to get columns as 'struct' in timetable

For the record, you are correct that timetable is the recommended way to work with timestamped data, but there are no plans to a...

23 giorni fa | 1

Plotting double vs datetime (DD-MM-YY), only the year is used from the datetime

Paul, in addition to what Walter said, those mat files each contain a bunch of 23041xN variables. Likely you would benefit from ...

23 giorni fa | 0

| accettato

How to update leap seconds

James, there's no way for customers to update MATLAB with new leap seconds. The IERS data is built into a binary file. The last...

2 mesi fa | 0

| accettato

How to find differences between 2 large tables that have a mix of string and numbers?

I thnk looping over every row in the tables will not be very performant. I would think this will do better: matches = false(siz...

5 mesi fa | 0

Importing data from Delsys Trigno software .csv

If you really have a csv, if it really has variable names spread over two lines, user NumHeaderLines to tell readtable to skip e...

5 mesi fa | 0

How to use groupsummary to group by hour-of-year

Is this really "hour of year", a value that runs from 0 to 8784? In the same way that day of year is just dt = datetime(2023,7,...

5 mesi fa | 0

mean of all these variables over latitude x longitude x time that is (5 x 5 x 2)

It's very likely that you should be using a timetable. You have "eight variables loaded with data (latitude,longitude,time,mont...

5 mesi fa | 0

How to calculate the date 0.25 years after the date of January 15, 2020

This is a long thread. I hope the following will clarify a couple things. The years function is not really intended for precise...

5 mesi fa | 0

seasonal mean for each year based on the sample code

As in your other post, I can't follow youre code, but my strong recommendation is to read in your data using readtimetable, and ...

5 mesi fa | 0

Duplicating categorical array to floating point value for perfcurve function

The short answer is that you can call double on a categorical array to get the category numbers as a numeric array. But that may...

5 mesi fa | 0

years in fourth dimension is not printing properly

I can't follow youre code, but my strong recommendation is to read in your data using readtimetable, and then use groupsummary o...

5 mesi fa | 0

How to rename identical variables under one common name?

This just SCREAMS for using categorical. Screams. This might seem like more work, but untimately you will be happier. TextData ...

5 mesi fa | 0

How do you access table data to be used with basic operators?

There are suggestions in this thread pointing in different directions. To answer the question as stated in the post's title, thi...

5 mesi fa | 0

How to reference a cell from a table within a table

Aron, it sounds like you have tables in a cell array in a table. Dirk is assuming you have "nested tables", which is different b...

5 mesi fa | 1

constructing a table from a particular data set

You almost certainly do not want to do all the calculation "by hand" as Sharad's answer shows. Import into a timetable, then us...

5 mesi fa | 0