Community Profile

photo

Peter Perkins

MathWorks

Last seen: 4 giorni fa |  Attivo dal 2011

Statistics

All
  • 5-Star Galaxy Level 5
  • Personal Best Downloads Level 1
  • First Submission
  • 36 Month Streak
  • Guiding Light
  • Thankful Level 1
  • Revival Level 2
  • Knowledgeable Level 5
  • First Answer

Visualizza badge

Content Feed

Visto da

Risposto
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.

circa un mese fa | 1

| accettato

Risposto
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...

circa un mese fa | 0

Risposto
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...

circa un mese fa | 0

Risposto
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...

circa un mese fa | 1

| accettato

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

circa un mese fa | 2

| accettato

Risposto
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....

circa un mese fa | 0

Risposto
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...

circa un mese fa | 1

Risposto
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...

circa 2 mesi fa | 0

| accettato

Risposto
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...

circa 2 mesi fa | 1

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

circa 2 mesi fa | 1

Risposto
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...

circa 2 mesi fa | 1

Risposto
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...

circa 2 mesi fa | 1

Risposto
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...

circa 2 mesi fa | 0

Risposto
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...

circa 2 mesi fa | 1

Risposto
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...

circa 2 mesi fa | 0

Risposto
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...

circa 2 mesi fa | 0

Risposto
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...

circa 2 mesi fa | 1

| accettato

Risposto
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...

2 mesi fa | 1

Risposto
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-...

5 mesi fa | 0

| accettato

Risposto
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...

5 mesi fa | 0

Risposto
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...

6 mesi fa | 1

Risposto
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...

7 mesi fa | 1

| accettato

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

7 mesi fa | 1

| accettato

Risposto
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 ...

7 mesi fa | 3

| accettato

Risposto
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...

7 mesi fa | 0

Risposto
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...

8 mesi fa | 0

Risposto
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 ...

8 mesi fa | 0

Risposto
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, ... ...

8 mesi fa | 0

Risposto
How to grab the first instance of a timestamp based on the second
It's a one-liner using a timetable and retime, with NewTimeStep 'secondly' and Method 'firstValue': >> tt = timetable(rand(10,1...

8 mesi fa | 0

| accettato

Risposto
how can I calculate movmean from 1 periode wave data?
In addition to what Mathieu suggests, there are similar things shown in these examples, especially the first one: https://www.m...

8 mesi fa | 0

Carica altro