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Campion Loong

MathWorks

Last seen: 8 days ago Active since 2015

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Answered
How do I specify a variable from a table that uses words and not numerical values
I would use a categorical for trashTags. trash = readtable('Litterati_processed_data.csv'); trash.Tags = categorical(trash.Tag...

3 months ago | 0

| accepted

Answered
How to apply an 'AggregationFunction' with two variables in unstack ?
How about this? >> t_groupsum = groupsummary(t,'group','sum',{'var1','var2'}); >> t_groupsum.Properties.RowNames = t_groupsum....

6 months ago | 0

Answered
How to Select Specific Time Intervals Over a series of time steps
I second Ameer's logical indexing approach. On the other hand, if this is representative of your data format, you may consider k...

8 months ago | 1

Answered
speed up renamecats/categorical multiple columns
Hi Peng, It seems you have the Dictionary code book to boot, and you already know which sets of code go wtih which field/name i...

10 months ago | 0

Answered
Convert Table to double vector
Hi Ameer, If you have R2019a and newer, you can try using readmatrix to directly read the file as numeric: https://www.mathwor...

10 months ago | 0

Answered
Slow 2020a performance writing to a Table in a loop
Hi Charles, Thanks for bringing up this performance question. I assume from your code snippet the timing is done either in the ...

1 year ago | 1

Answered
Poor R2019b performance with tables
Hi all, Continuing our investment in performance, R2020a has been released with more indexing improvement in table, timetable, ...

1 year ago | 4

Answered
Poor R2019b performance with tables
Thank you all for keeping track of table performance. First of all, we regret that the performance improvement in assigning i...

1 year ago | 2

Answered
Match datetime within 3 seconds from two tables of different sizes
This is a good question! Basically, if I understand correctly, you want to extract rows from table_2 whose timestamp matches tha...

1 year ago | 3

| accepted

Answered
Use datatime data of one table to find (and write) the nearest datetime and corresponding value data in another table
Use timetable instead of table for timestamped data. You may use table2timetable to convert table to timetable; or use readtimet...

1 year ago | 1

Answered
How to rearrange categoricals to a specified sequence
The categories of your categorical array is sorted in alphabetical order. % 'c' is your categorical array >> categories(c) an...

1 year ago | 0

Answered
Find column with error and delete it
You can fine-tune how MATLAB imports your data using various Import Options (Create import options based on file content). First...

2 years ago | 0

Answered
sorting unique date by time.
As Steve suggested above, you should import the CSV into a timetable and unstack to get what you want. I'd also mention the dete...

2 years ago | 0

Answered
Reducing a cell array of tables to a single table
Hi Ingo, Glad you've found a solution. In case it maybe useful in your workflow, I'd like to mention the various Datastores a...

2 years ago | 0

Answered
How to interpret ButtonDownFcn event data for axis which limit is datetime?
As Walter suggested, pasting my <https://www.mathworks.com/matlabcentral/answers/357449-how-to-interpret-buttondownfcn-event-dat...

4 years ago | 2

| accepted

Answered
Problem with 'keeplimits' for dates on figure x-axis
Hi Luc, I see that you are utilizing the |datetime| datatype <http://blogs.mathworks.com/loren/2015/02/12/introduction-to-the...

6 years ago | 1

| accepted

Answered
How to plot date and time on one axis?
Hi Philipp, It's been some time since your question. Hopefully this can still be of some help. If you have access to MATLA...

6 years ago | 0

| accepted