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Eric Sofen


Last seen: 2 days ago

MathWorks

57 total contributions since 2018

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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 ...

2 days 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...

2 days 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...

2 days ago | 0

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

6 days 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 days 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 days ago | 0

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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 days 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.

2 months 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...

4 months ago | 0

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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 ...

4 months 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...

4 months 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...

4 months 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 ...

4 months 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...

4 months 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.

5 months 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...

5 months 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.

5 months 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 ...

5 months ago | 0

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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 ...

5 months ago | 1

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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. ...

5 months ago | 0

Answered
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,'...

5 months 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 ...

6 months 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...

6 months 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...

6 months ago | 0

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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...

6 months ago | 0

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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...

6 months ago | 1

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How to bin a variable and create new variables for each bin
I'd encourage you to consider whether you really need separate tables for each age bin or whether you can simply add a grouping ...

6 months ago | 0

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how to create center-justified table elments
When you say you're "trying to make a table in a plot" I assume you're referring to uitable? If so, you can use uistyle to deter...

6 months ago | 0

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how can i display on a table's cell different colors ?
It sounds like you're on the right track. You want to apply the addStyle to the uitable, not the uifigure: % setup fig = uifig...

6 months ago | 0

Answered
Filter table data into matrix
From your description, it sounds like you want data for MJJ for all years? Assuming your data is in a timetable and your dates a...

7 months ago | 0

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