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Eric Sofen

MathWorks

Last seen: 5 Tage ago Active since 2018

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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...

etwa 2 Monate ago | 0

Answered
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...

2 Monate ago | 0

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

2 Monate 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...

2 Monate 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 ...

5 Monate ago | 0

Answered
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...

5 Monate 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...

5 Monate ago | 0

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

6 Monate 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...

6 Monate 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,...

6 Monate 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...

6 Monate ago | 0

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.

8 Monate 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...

10 Monate 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 ...

10 Monate ago | 0

Answered
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...

10 Monate 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...

10 Monate ago | 0

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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 ...

10 Monate 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...

10 Monate ago | 0

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Answered
Table to variable (I have a full path name)
If you want to read that spreadsheet into a MATLAB table, use readtable rather than load.

10 Monate ago | 0

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Return rows from a table with a unique combination of categories
You don't say what's not working, but I think you're probably running into findgroups on an array throwing an error. To find gro...

10 Monate ago | 0

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Answered
How do I convert monthly data to quarterly using as the value of the quarter the value of the 1st month of each quarter?
Another timetable option is to use retime with the 'firstvalue' aggregation method.

10 Monate ago | 0

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Creating n number of tables using already present table in matlab
I would advise that in many cases, you're better off adding a grouping variable based on the conditions you described and doing ...

10 Monate ago | 0

Answered
Problem with processing large data set
I'm not sure of the BiLSTM-CNN input requirements, but for starters you're probably better off storing those timeseries as rows ...

10 Monate ago | 1

Answered
Datetime in a loop that concatenates NetCDF
The last line of your loop: time(Nfiles)=time; should be time_all(Nfiles)=time; so that you update time_all. ...

10 Monate ago | 0

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How to convert a column in a table to date format for plotting a time series?
There's no need to replace the 'T' and 'Z' literals. Datetime formats can include literals: datetime(Column_of_Time_Strings,'...

10 Monate ago | 0

Answered
Merge scatterhists to one- Create
If you combine your SHALLOW and DEPTH data and add a simple grouping variable based on the height of SHALLOW and DEPTH, you can ...

11 Monate ago | 0

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Formatting .dat gps file
Unless there's an existing reader for that file format, you're going to need to read it in as text and parse it into something m...

11 Monate ago | 0

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frequency of wind speed in a particular direction
It sounds like what you want is a 2D histogram where each bin represents the amount of time that the wind was blowing in a parti...

11 Monate ago | 0

Answered
time series and grouping
It's tough to give a detailed answer without seeing the structure of your data and preliminary code, but here are a few suggesti...

11 Monate ago | 0

Answered
String to raw data conversion problem (Timestamp Data)
Even simpler...you don't need to strip off the leading and trailing brackets. Datetime can parse formats with character literals...

11 Monate ago | 1

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