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Eric Sofen


Last seen: 3 días ago

MathWorks

49 total contributions since 2018

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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...

22 días 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 ...

22 días 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...

23 días 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...

23 días 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 ...

23 días 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...

23 días 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.

alrededor de 1 mes ago | 0

Answered
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...

alrededor de 1 mes 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.

alrededor de 1 mes ago | 0

Answered
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 ...

alrededor de 1 mes 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 ...

alrededor de 1 mes 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. ...

alrededor de 2 meses 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,'...

alrededor de 2 meses 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 ...

3 meses ago | 0

Answered
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...

3 meses ago | 0

Answered
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...

3 meses 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...

3 meses 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...

3 meses ago | 1

Answered
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 ...

3 meses ago | 0

Answered
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...

3 meses ago | 0

Answered
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...

3 meses 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...

4 meses ago | 0

Answered
Problem Importing Text File into TimeTable
Because the second variable is uses ":" as a separator, it is being treated as a duration by default. I would recommend using im...

7 meses ago | 0

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Answered
empty space between values when making bar chat with datetime
That's a tough one. Obviously, if you were doing a standard x-y plot, you'd want the datetime axis to realistically represent ti...

7 meses ago | 0

Answered
Preprocessing: excel table headers into categoricals
stack is the function that does the operation that converts a "wide" table with separate variables to a "tall" table with an ind...

7 meses ago | 0

Answered
I want to import only specific Types of variables using readtable.
You can use vartype to subscript into the table and select only variables that are a certain datatype (or meta-type like 'numeri...

7 meses ago | 0

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Answered
Select specific rows in Matlab Table.
I would suggest counting the unique times, then you can split up the table based on the counts: d = datetime(2018,1,1,[1 2 4 4 ...

7 meses ago | 0

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Answered
Add datetime vector which contains NaT to double
The NaT isn't the problem. You cannot concatenate datetime and double in a homogenous matrix: >> x = [1 2 datetime('now')] E...

8 meses ago | 0

Answered
How to calculate average of data over a given time period?
It would be helpful to see what your data looks like (are different time components) split into different table variables?) But ...

8 meses ago | 0

Answered
Change data type of a table column into datetime?
Take a look at the convertvars function for changing the data type of a table variable. Also, is there a reason you're bring in...

8 meses ago | 0

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