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Eric Sofen

Last seen: 3 giorni ago Active since 2018

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Answered
Convert DoY and hour to datetime format
The datetime constructor is forgiving about day values that don't fit within a particular month and wrapping them appropriately:...

2 giorni ago | 0

Answered
Compare table variables with input list and replace missing vars with NA
Readtable and outerjoin do the trick (xlsread is discouraged at this point - readtable is preferred). FYI, there's also a join L...

4 giorni ago | 1

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Sorting/Grouping based on date for all years
The isbetween function can also help simplify a lot of the logical indexing to pull out the ranges of interest. tt = readtime...

9 giorni ago | 1

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How to make the following code valid for tables not only matrices
There are a few ways to rework the indexing to work with tables. By the way, I'm not sure what the loop does (ied doesn't appear...

11 giorni ago | 0

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How do I find a single value by corresponding data in 2 different tables?
It sounds like you are trying to align these two things based on time? If so, check out the synchronize method of timetable. The...

4 mesi ago | 0

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Replace string values in a table
This is what categorical is built for! When you create the categorical, you can specify the data, value set, and category names....

4 mesi ago | 0

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How to extract table data based on column values?
One thing to watch out for is that the char vectors contained in the cell arrays (celltrs) can vary in the number of characters,...

4 mesi ago | 0

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Answered
I want to separate each gait cycle and keep each cycle in a row of a table.
If you separate each cycle into a separat row, the rows will likely have data of different lengths, which then gets hard to work...

7 mesi ago | 0

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Answered
Problem with datetime in German
We’re aware of the issues with parsing month abbreviations in some locales, and we're looking at ways to improve this. In this c...

7 mesi ago | 1

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Creating a for loop that goes through 12 month data in sets of 2
T = readtable('Levenmouth7MWTurbineData2019.csv') ; T.month = month(t.disc_TimeStamp); tiledlayout(3,2) for m = 1:2:12 m...

7 mesi ago | 0

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Answered
Multi Row Tables / Combine information where row is equal?
You can use varfun to apply the cumsum function to each group defined by Parset1. Parset1=['A';'A';'B';'B']; Parset2=['x';'y';...

7 mesi ago | 1

Answered
Why am I getting the following datetime error message?
I think it's just a typo in your timestamp format spec: ss.sssZ should be ss.SSSZ

7 mesi ago | 0

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Answered
How to make a new table from two different table with common value?
You should be able to use innerjoin on T1 and T2 - no need for C. The innerjoin function calculates the equivalent of C as an in...

10 mesi ago | 0

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Summarize two tables of different data and dates into exact matches of one of the two datasets
Another way to solve this is to synchronize the lower-resolution chemistry timetable to the higher-resolution discharge data. My...

11 mesi ago | 0

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How to handle NAN when summing
You can pass a flag to sum to 'omitnan'.

11 mesi ago | 0

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Answered
How to match trial number to time stamps given two sets of data?
Assuming your timestamps are durations (you probably want A to be a timetable with duration row times), you can use the isbetwee...

11 mesi ago | 0

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Answered
How can I compute the mean value over a time interval?
If you have, for example, data once per second for an hour and you want to calculate mean values for each minute, I'd recommend ...

circa un anno ago | 0

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Plot data from a table that has years in the rows and months in the columns
Here's another way to tackle this, sticking with using table to contain your data. t = readtable('NOAA_CPC_OceanicNinoIndex.xls...

circa un anno ago | 0

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Loop through date time heart rate data
Can you assume that the data is always sampled uniformly every 2 minutes? That can simplify things, but the code below should be...

circa un anno ago | 0

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create a 2 dimensional table from a table containing multidimensional entries
Check out the splitvars function.

circa un anno ago | 0

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Retime data aggregation for ID
Another approach is to unstack the timetable based on the sensor ID, so you'd have a wide timetable with separate variables temp...

circa un anno ago | 0

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Timetable - loop through days to check for a condition occurring during midday the day prior to midday of the current day
As a starting point, take a look at the retime function. I think the easiest way to do this is create a copy of the timetable,...

circa un anno ago | 0

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Answered
How to plot the graph according to the time
Read the data in as a timetable, You can pull out all the data where the hour is 8 by doing: tt8 = tt(tt.Time.hour == 8, :) Th...

circa un anno ago | 1

Answered
Compiled Function trying to access non-existent @tabular\hasvars.m method (matlab 2020a)
I looked into that warning, and you can safely ignore it. It is also not present in R2020b.

oltre un anno ago | 0

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Answered
Cumulative sum within group, reset when encounters a 0
It took me a while to come up with a way to do this without looping, then it clicked! You need to create groups based on where t...

oltre un anno ago | 0

Answered
How to combine two tables with measurements taken over the same range but different intervals?
This is a tricky problem. I agree that conceptually it seems like a join, but you don't have exact matches in start/end between ...

oltre un anno ago | 0

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Extract partial data from datetime using logics/vectorization
I would extract the time components first and then deal with grouping by day of the week. It's easy to keep this all organized i...

oltre un anno ago | 0

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Answered
Sort cell array by datetime
Even better, since you're working with data where each column has a different type, consider using a timetable. t = table2tim...

oltre un anno ago | 0

Answered
Avoid datetime changes due to saving daylight
Do you need to use time zones in your app? In MATLAB, you can work with "unzoned" datetimes, where Daylight Saving Time doesn't ...

oltre un anno ago | 0

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Answered
Hourly and 6-hourly average of data in timeable
If you want the rolling average, use smoothdata, with 'movmean' as the method and (e.g.) hours(6) as the window. If you want non...

oltre un anno ago | 0

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