Community Profile

# Peter Perkins

### MathWorks

Last seen: 14일 전 2011 이후 활성

All

배지보기

#### Content Feed

보기 기준

답변 있음
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...

16일 전 | 1

| 수락됨

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

19일 전 | 1

| 수락됨

답변 있음
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 ...

19일 전 | 3

| 수락됨

답변 있음
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...

19일 전 | 0

답변 있음
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...

20일 전 | 0

답변 있음
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 ...

20일 전 | 0

답변 있음
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, ... ...

20일 전 | 0

답변 있음
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...

22일 전 | 0

| 수락됨

답변 있음
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...

22일 전 | 0

답변 있음
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...

22일 전 | 0

| 수락됨

답변 있음
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...

22일 전 | 0

답변 있음
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...

23일 전 | 0

| 수락됨

답변 있음
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...

23일 전 | 1

답변 있음
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 ...

23일 전 | 0

답변 있음
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...

23일 전 | 0

답변 있음
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...

23일 전 | 0

답변 있음
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...

23일 전 | 0

답변 있음
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...

23일 전 | 0

답변 있음
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 = ...

23일 전 | 1

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

23일 전 | 1

| 수락됨

답변 있음
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 ...

23일 전 | 0

답변 있음
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...

약 2달 전 | 0

| 수락됨

답변 있음
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...

약 2달 전 | 0

답변 있음
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...

3달 전 | 0

| 수락됨

답변 있음
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...

3달 전 | 0

| 수락됨

답변 있음
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...

3달 전 | 0

답변 있음
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.

3달 전 | 0

답변 있음
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...

3달 전 | 0

답변 있음
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...

3달 전 | 0

답변 있음
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...

3달 전 | 0