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Peter Perkins

MathWorks

Last seen: 5 days ago Active since 2011

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Answered
Extract SST data in a polygon from average monthly netcdf file
Simbarashe, readtable and readmatrix read your file just fine, so I don't think that's the issue: >> sst2 = readmatrix("sst2.tx...

12 days ago | 0

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Answered
Model calibration for different dates
I would think that the best way to do this would be to put your data into a timetable, and use the rowfun function with the date...

12 days ago | 0

Answered
How to get a sum of coloumnn linked to datetime?
Create a timetable from your data, and use retime to aggregate it to monthly. It's one line of code.

3 months ago | 1

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Answered
How do I pull data between specific dates like Vlookup formula in Excel?
As Walter says, uses a timetable. >> tt = readtimetable("sampledata_uyyk.csv") [some warnings removed] >> tt = convertvars(tt...

3 months ago | 0

Answered
date and time string identification
"I have the following information obtained from a text-file date_hne: {'2014' '04' '01' '23' '46' '44.998300'}" I don't s...

3 months ago | 0

Answered
how to convert hours and minutes from decimals to datetime objects
Converting to string is totally unnecessary. Assuming the first variable in the table is already a datetime: >> t = datetime(20...

3 months ago | 1

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Answered
Effect of os clock change on timers
cr, this was a bug in earlier releases, and got fixed in R2021a.

3 months ago | 2

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Answered
Live Editor: Brace indexing changes Table to Struct
You can certainly post something like the table you have. In any case, if A is a table, then A.all is a variable in that table....

3 months ago | 0

Answered
How can I delete some specific rows from a matrix?
Surely you don't just have a list of dates. Presumably you have data at each date. Use a timetable to store all that. At that p...

3 months ago | 1

Answered
Select column in timetable based on value in table
Two steps: 1) Find the nearest sensor. This easy using interpolation: >> load("SL.mat") >> load("SensorLoc.mat") >> SensorLo...

3 months ago | 0

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Answered
Is it possible to use vertcat with dot notation?
Depending on what you are doing, you may find it convenient to turn that struct into a table (which wil automatically vertcat th...

3 months ago | 1

Answered
A very fast way to convert numbers into datetime ?
Syntactically, >> time = datetime("202210270954498", 'inputFormat','uuuuMMddHHmmssSSS', 'Format','yyyy-MM-dd HH:mm:ss.SSS') t...

3 months ago | 1

Answered
How to find specific elements in cell array not followed by another specific element?
If you have time and other data, think timetables (also Walter is right about categorical): action = categorical([1;3;2;4;1;3;2...

3 months ago | 1

Answered
Getting Data from Cell: Dynamic Structure needed?
Simon, what you should do depends very heavily on what you want to do with these data, i.e. what "take the value of the needed d...

3 months ago | 1

Answered
trying to find highest values in a time segment
It's not clear to me that Image Analyst's solution answers your question, mostly because your question is not very clear. If the...

3 months ago | 0

Answered
How to fix non-alignment issue when plotting multiple axes
Dinuka, if that's the plot you are looking for, I guess Voss' suggestion gets you there. But I might also add: y1=0.45 + .3*ran...

3 months ago | 1

Answered
Storing Variables in a loop to out put in a table
Make a timetable: i = (1:9)'; a = i-1; b = i.^2; c = i + rand(9,1); d = rand(length(i),1); e = rand(length(i),1); f = ran...

4 months ago | 0

Answered
Issue Plotting 2 different Values
Cedric, I can't really follow your code or your explanation, but I would think you want something like this: ice = readtimetabl...

4 months ago | 0

Answered
Coverting Timetable to Column Vector
Sam, it looks like you are ending up with a 7201x6 timetable whose variables are cell arrays, and each cell contains a 500x1 dou...

4 months ago | 1

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Answered
A very fast way to sort datetime (in "ascend" mode)?
It seems like the obvious response to Any way faster than this one ? [~, idx2] = sort(datenum(a), 1, 'ascend'); is to...

4 months ago | 1

Answered
Average of variables in timetable belonging to the same day over several years
Ziad, it seems that "dayofyear" is using "serial day number of year", and as you found, is lumping 29-Feb's with the non-leap 1-...

7 months ago | 0

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Answered
Compile data from excel sheets into a dataset with multiple tags
Charlie, I'm confused. I haven't followed all of what you code does, but it seems that you are lining up tables of different he...

7 months ago | 0

Answered
Only required the mean value out rather then every single value in a data
"7" sounds rather suspiciously like "weeks". If this were a timetable, it would be a one-liner with groupsummary. Moral: don't t...

8 months ago | 1

Answered
Using date and time in MATLAB
I'm having trouble following exactly what needs to be done, but I imagine you want to append variables to your LoadProfile&Tarif...

9 months ago | 1

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Answered
Help Merge two tables by the column variables
See join (or maybe innerjoin).

9 months ago | 1

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Answered
generate an independent seed with a fixed number
Ebru, you are doing parallel simulations and presumably want to combine the results under the assumption that those results are ...

9 months ago | 3

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Answered
Export rows as combined separate CSV files
There are a bunch of ways to do this. I thought I'd see how well rowfun works: > C = {rand(10,1) rand(10,1); rand(10,1) rand(10...

9 months ago | 0

Answered
Error: Row index exceeds table dimensions.
SOLARL.Date2 = datenum(SOLARL.Date); DON'T do that. Just use datetime. You can call unique, length, and == a on datetime vector...

9 months ago | 0

Answered
Elementwise calculations when making a new Table column
Will noone think of the joins? "I am trying to find (value1-min)/(max-min) using the appropriate max and min for the protocol ...

9 months ago | 0

Answered
unstack table with pre and post measurements
unstack needs you to tell it three things: 1) which variables to unstack. It looks like you want SystemWeight, JumpHeight, ... ...

9 months ago | 0

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