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Peter Perkins

MathWorks

Last seen: 20 days ago |  Active since 2011

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Answered
How to preserve nanosecond precision in datetime calculations (for large numbers)
I don't know if this helps or just confuses the issue, but there is another way to do what the OP has asked for: x = int64(1294...

21 days ago | 0

Answered
How to extract date time from format unique to InputFormat?
Another possibility: str = "05/17/24 04p:48:15.8148625" str = replace(str,"p","pm") datetime(str,InputFormat="MM/dd/yy hha:mm...

1 month ago | 1

Answered
How to replace the missing values in cell array with previous ones?
The real problem is "cell array". Not sure what things like '01L' represent, but as others have suggested, your cell array is mo...

1 month ago | 0

Answered
How to use datetime with leap second strings?
Parsing timestamps with leap seconds At the moment, con9verting from text to the UTCLeapSeconds "time zone" requires a specifc ...

1 month ago | 0

Answered
SNR vs Amplitude plot for ECG Lead
Elzbieta, I have not read your code closely but it seems very likely that stackedplot on a table or timetable will do what you w...

1 month ago | 0

Answered
Eventfilters with durations return wrong (amount of) rows?
Soc, I think you need test_table = timetable(milliseconds(1:5000).', linspace(0, 1, 5000).'); test_times = milliseconds([1101 ...

3 months ago | 1

| accepted

Answered
How do I reduce categorical array containing alternate spellings and formats?
Chris, something puzzles me. You say, "I have a categorical array of length ~ 10,000 and typical string length ~ 10 to 20. Acc...

3 months ago | 0

Answered
assign the fields of a structure correctly
Most of what's being shown in the responses is unnecessary. It's easier than that. No loops needed, not even ismember. 1) vertc...

4 months ago | 2

Answered
Error in Matlab Data Filtering from an Excel FiIe
This seems like a lot of unnecessary extra code. Let the table you read in do the work for you. %data = readtable('MLAT_Sat2.xl...

7 months ago | 0

Answered
Converting a cell array to can message timetable
I don't know much about the Vehicle Network Toolbox, but the following suggests that your code has two problems: ... >> ...

7 months ago | 0

Answered
Find max within due date and find max within due date by class section
This is much simpler than the accepted answers suggests. And you want to use categorical for categorical data, not text. %t = r...

7 months ago | 0

Answered
Unable to outerjoin two tables, Error message of 'Left and right key variables have incompatible types'
Jay, it's impossible to know what you are doing from what you've posted. outerjoin does work with ordinal key variables, so you ...

7 months ago | 0

Answered
Calculating with different date times
I would think you would want to compute performance at each speed measurement by interpolating heart rate, rather than computing...

7 months ago | 0

Answered
Reading Multiple Excel Files, Analyzing and Indexing
In a fairly recent (most recent?) version of MATLAB, you can do something like the following. First create some fake CSV files: ...

7 months ago | 0

Answered
Duration type doesn't preserve seconds accuracy
James, Stephen's response is what I would have said, but there are a lot of things in this post, and I thought I would add to St...

8 months ago | 0

Answered
How to output a for to a 10x27 table (for loop keeps overwriting the variable)
Marshall, the advice to try to vectorize is good advice, but if that's not possible, you might try something like at this: heig...

1 year ago | 0

| accepted

Answered
Customized datetime format within table
Vic, I think you want synchronize. tt1 = timetable([1;2;3;4;5],RowTimes=datetime(2023,1:5,1)) tt2 = timetable([6;7;8;9;10],Row...

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
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 ...

1 year ago | 0

Answered
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...

1 year ago | 1

Answered
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...

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
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 = ...

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
Sampling and Filtering Table Data
Presumably you would have a timetable. If you have the Signal Processing Tbx, you should look at resample.

1 year ago | 0

Answered
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;...

1 year ago | 1

Answered
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{:});...

1 year ago | 0

Answered
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...

1 year ago | 0

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