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Peter Perkins

MathWorks

Last seen: 8 jours ago Active since 2011

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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...

10 jours ago | 1

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

13 jours ago | 1

| accepted

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 ...

13 jours ago | 3

| accepted

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...

13 jours 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...

14 jours 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 ...

14 jours 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, ... ...

14 jours ago | 0

Answered
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...

16 jours ago | 0

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Answered
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...

16 jours ago | 0

Answered
How to compare 2 columns line by line between two matrix of different size?
ismember will work, but ithis is a join operation. It's a one-liner: >> matrix1 = readtable('datasetPDP.csv'); >> matrix2 = re...

16 jours ago | 0

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Answered
averaging columns in a table based on two other columns
This should be straight-forward using either groupsummary, or varfun with displacement_pixel as the input/data variable and x_pi...

16 jours ago | 0

Answered
How do I make an array from select points in a large table (based on dates)?
Alex, you already have a timetable, which is the right thing to use. To help get you started: >> i = isbetween(timeofday(UMR202...

17 jours ago | 0

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Answered
How to reformat this table's information so that a column of data becomes the header's for matching data?
I guess this is a useful format? Voss shows one way, here's another: >> Items = "Item" + (1:8)'; >> Family = "Family" + [1;2;4...

17 jours ago | 1

Answered
Import and export excel data having combined number and text in a single cell.
If each cell of your spreadsheet literally contains things like "4-sample1-sample2-(23.56,-13.54)", then you may want to figure ...

17 jours ago | 0

Answered
Stacked plots: display two variables on the same x-axis
Farbod, IIUC, you cannot do that with stackedplot. Each subplot can have only one y axis. The whole point of stackedplot is to a...

17 jours ago | 0

Answered
retrieve data specific date
In addition to what KSSV shows, since you say "retrieve data", I recommend that you use a timetable, and things like timerange,o...

17 jours ago | 0

Answered
Outerjoin does not merge the keys
As Kevin implies, your are using all four variables in smalltable as keys. That makes no sense. On top of that, there are NO com...

17 jours ago | 0

Answered
Combination of two signals with different sample rates
Use a timetable, and call synchronize. synchronize uses interp1, but it may be that you particularly want to use the SP-oriented...

17 jours ago | 0

Answered
Problem in determining standard error and plotting 3 error bars
Zhou, independently from how to make the figure, this code Data = table2array(WORK01S1); % convert it into array Temp = ...

17 jours ago | 1

Answered
Select best time in an array
You are making your life more difficult using fopen etc. Use writetable and readtable: >> laptimes = readtable("laptimes.txt","...

17 jours ago | 1

Answered
tic/toc versus time.perf_counter_ns()
The doc doesn't say you can't use tic/toc to time very short things, and clearly that is not true: >> tic, x = 1; toc Elapsed ...

17 jours ago | 0

Answered
How to extract time series averaged over a region?
Keegan, there's a bunch of ways to do this, here's one that uses a timetable: >> lat = ncread("chl2020.nc","latitude"); >> lon...

environ un mois ago | 0

| accepted

Answered
How can I merge successive row values (sum of the values) of the column Y according to a condition in column X?
You want to do grouped sums, where the groups are defined by consecutive zeros in X. Once you have the groups defined as a new v...

environ un mois ago | 0

Answered
Stackedplot: Incorrect x-axis values & multi-variable usage
Jackson, you have a table, and while stackedplot knows to plot against time with a timetable, it can't know what to plot against...

3 mois ago | 0

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Answered
How to do interpolation only if data interval is > than 3h?
StarStrider's suggestion of datetime and retime is the way to go. Also, like SS, I am mostly guessing at what you are asking for...

3 mois ago | 0

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Answered
readtable decide which coloumns are read as string and which as number. xlsx file
Magnus, detectImportOptions and subsequent modifications on what it returns are what you are looking for. You can set any or all...

3 mois ago | 0

Answered
How do I load only part of a table saved to a .mat file?
You might look into using datastores, which would, in effect, allow you to load pieces.

3 mois ago | 0

Answered
Read variable in .mat workspace
Rachael, the times are not part of the data, they are "metadata". But as your screenshot shows, the row times of the Acceleratio...

3 mois ago | 0

Answered
Table of tables. Subtables have variable height
Joanna, I suspect that you are 95% of the way there, but it's hard to tell. You say, "each column of subtables has the same widt...

3 mois ago | 0

Answered
How to do a lookup for the best number that suits a condition between two arrays?
If you create gap as a row, and shim as a column, this is only a couple of lines. < will automatically expand the two vectors to...

3 mois ago | 0

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