# Eric Sofen

Last seen: 2 días hace Con actividad desde 2018

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Create excel file from json variable value
I'm roughing this a bit since I don't have your JSON data files, but the below approach puts your file names in a table, then us...

4 meses hace | 0

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Sort rows of a table by column within a variable
There isn't a one-line solution to this, but here's another approach that hoists the data you want to sort by out of the table a...

6 meses hace | 0

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Frequency of unique items per month from timetable data
I think groupcounts will also solve your problem (it would be helpful to have some sample data in the question in a form I could...

7 meses hace | 0

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Find locations of a value in 3-D matrix (lat x lon x time) and take the two time steps before and after those selected values
Since you're using lighting as a logical mask on the precipitation data, you can shift the array one or two time steps and re-ap...

más de 1 año hace | 0

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Rank stock returns by month
First off, get your dates into datetime rather than YYYYMM doubles! Then, you can use groupsummary to group the data by month a...

más de 1 año hace | 0

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Retime Yearly Maximum - Finding Corresponding Dates from Timetable
This example gives another way to get the time when the max occurred. See the findMax function and how it's used in rowfun. The ...

más de 1 año hace | 1

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How to extract specific dates from a datetime table?
If you know all the datetimes have 10:00:00 time components and you're just matching dates, timetable subscripting does that dir...

más de 1 año hace | 2

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Automatically create a several layer structure from a cell array
Another approach is to string this out into a table, converting what were labels along each dimension into grouping variables. S...

más de 1 año hace | 0

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Problems trying to find fakes dates.
The reason datetime(2005,2,29) works is that we want to support constructing a vector of datetimes: datetime(2023,1,1:100) Not...

más de 1 año hace | 0

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Case insensitivity for keys in outerjoin and ismember?
We've had a variety of requests for a "lenient" join, but there's also a variety of different interpretations of "lenient." :-) ...

más de 1 año hace | 1

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How I can create a while cycle that ends after a sepecific time
I think timer is likely to give you better precision for this sort of thing than tic/toc (tic/toc is better for timing performan...

más de 1 año hace | 0

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convert cell array into date and time string
As much as I love string, there's no need to do an extra type conversion. Just concatenate the elements of the cell into a char ...

más de 1 año hace | 0

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Break array or timetable into smaller versions and find max value
Normally, groupsummary or varfun should be the starting point for grouped calculations like this, but your particuar problem is ...

más de 1 año hace | 1

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result in table format or excel format
It's a little circuitous, but you can use writelines to write the char vector to a text file, then use the power of readtable to...

más de 1 año hace | 1

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Merge tables with different columns and for matching columns update missing values in left table with values from right table
This is a tricky combination, and not doable in a single join right now. As you say, the outerjoin of A and C to create a table ...

más de 1 año hace | 0

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How to extract all the data between two different dates?
I'd recommend using a timerange. Isbetween returns a logical vector based on a vector of datetimes. This can then be used to in...

más de 1 año hace | 1

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How can I isolate and subplot June from the whole year?
Using datenum is no longer recommended. I'd encourage you to use datetime for date and time calculations in MATLAB. Among other ...

más de 1 año hace | 0

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We're aware of this issue and have been working to reconcile it. The time vectors in Simulink and timetable are constructed in b...

casi 2 años hace | 0

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Read netCDFs in loop and export to table with different sizes
I would suggest using timetable and the synchronize method. I assume nlevel is the sensor data? If so, build up a cell array of...

casi 2 años hace | 0

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divide year time data into days and nights
Steve beat me to it, but here's another solution that uses the datetime isbetween function. SunriseSunset = table((1:365)',date...

casi 2 años hace | 0

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Add code to have switch repeat if a case is not met
A while loop is one way to accomplish this. Also note that you can use lower() to reduce the number of cases. max_number = na...

casi 2 años hace | 0

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Here's another slightly different approach. There's no need to replace "/" with "-" for datetime to parse it. Duration can parse...

alrededor de 2 años hace | 0

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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:...

alrededor de 2 años hace | 0

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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...

alrededor de 2 años hace | 2

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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...

alrededor de 2 años hace | 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...

alrededor de 2 años hace | 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...

más de 2 años hace | 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....

más de 2 años hace | 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,...

más de 2 años hace | 0