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Lei Hou

Last seen: 6 days ago Active since 2019

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Answered
Specifying "MergeKeys" for "innerjoin"
Hi, Regarding the output of innerjoin, the key values from left table are the same as that from the right table. So, we only ne...

20 days ago | 1

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Answered
plotting data in the table
Hi, Stackedplot is designed to visualize table and timeble. Hoping it is helpful to you. Thanks, Lei

20 days ago | 0

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Hi. I have different data types (text and numeric) within the array range that I read from the input table. How can I avoid the error of using table2array and cell2mat?
Hi, Please check whether table2cell meets your need. >> t = readtable('Best NST models(1534002).xlsx'); >> table2cell(t)

20 days ago | 0

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Grouping consectuve datapoints from a table into an array
Hi Youssif, Try the following code to see whether it works for you. The main idea is to use diff to find the group edge, and th...

20 days ago | 0

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Answered
how to split table with different time values
Hi, Datevec is in discourage use now. You can use retime to group your data and do plot. >> tt = readtimetable('tb.csv') t...

20 days ago | 0

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Can one extract a unit of time from a duration object?
Hi Alexandre, Applying seconds/minutes/... to a duration array returns numeric value >> d1 = seconds(60) d1 = duratio...

20 days ago | 0

Answered
How to convert a time series data to txt file?
Hi James, You can use timeseries2timetable to convert your timeseries to a timetable. Then use writetimetable to write your dat...

20 days ago | 0

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How to concatenate 4 columns in one table into one coulomb
Hi, You can you mergevars to merge table variables. >> t = table("Japan_001164_jpg.rf.c02ee7802c701e228f23a4033eb236c2.jpg",38...

20 days ago | 0

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stack command errors with multiple column variables of different data types
Hi CAM, Your code is trying to stacking {'A1' 'B1' 'C1'} into one variable. Since C1 is text while A1 and B1 are numeric, an er...

3 months ago | 0

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Answered
Merge multiple tables with three keys
Hi David, I'm not sure whether I understand your problem correctly. Based on my understanding, outerjoin should help you with y...

3 months ago | 0

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Answered
Simple interactive plot with variable time axis
Hi Dormant, The function "stackedplot" is designed to plot time series data corresponding to the same time. I guess that functi...

3 months ago | 0

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I cannot interrupt the display of a very large table with "more on"
Displaying a large table is slow. I agree with you that Ctrl-C doesn't work. I used head(t) / tail(t) to just display the beginn...

3 months ago | 0

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Convert some Table Variables from Cell to Double
The funciton 'convertvars' is designed to be a convenient way to type conversion of table variable. Regarding your use case, you...

3 months ago | 0

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Plot time series data
The function 'stackedplot' is designed for plotting time series. >> C = {'2022-08-27T00:00:00.019538' 16065 '2022-08-27T...

3 months ago | 0

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segment exact time of signal
Hi Farhad, You can also use timetable + timerange indexing to complete your task. >> tt = array2timetable(val','StartTime',dur...

10 months ago | 0

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Answered
Determining the hourly time series from 5 minutes and 15 minutes time series data
Hi Manikandan, You can use timetable to store your data, and use retime to resample your data. rainfall = readtable('Rainfall....

10 months ago | 0

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(Select all that apply) In which of the following situations would you typically use a categorical array?
Hi Sangat, Typically, categorical is useful when your array is large, contains duplicated values and has finite set of discrete...

1 year ago | 1

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Answered
Filter a timetable (balance a panel data)
Hi Angelavtc, You can use unstack to first unstack the "Id" variable into multiple variables (In your case, into 3 variables). ...

2 years ago | 0

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Answered
Join several timetables with different variables and times and duplicates
Hi, I came up with two solutions. Solution 1: use outerjoint. It is easy to understand but have duplicated rows that need to b...

3 years ago | 1

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Answered
Searching tables, for modification
Hi Frans, To index into a table, you should use T{rows, vars} instead of T(rows, vars). May I ask a question about why didn't ...

3 years ago | 0

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Creating numerical variables from categorical variables in an unbalanced dataset
Hi Grigorios, You can do something as the following. catVar = categorical(["a" "b" "c" "b" "a"]); numValue = [0.1 3 100]; % T...

3 years ago | 0

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Answered
Plotting table data with dates
Hi Jinang, In your code, the first column of "A" is not a datetime. It is just numeric value calculated by using division opera...

3 years ago | 0

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Answered
datetime "PivotYear" doesn't work?
Hi Richard, The pivot year has an effect only when the 'InputFormat' parameter is specified and it includes y or yy. Therefore,...

3 years ago | 0

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Answered
Find a substring in table
Hi Katharina, You should cellstr to convert the categorical data to a cell array of character vectors as: startsWith(cellstr(t...

3 years ago | 0

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making `errorbar` work with `datetime`
Sai is correct that errorbar doesn't yet support datetimes. I've made an enhancement request, and hopefully errorbar will be upd...

3 years ago | 4

Answered
Find a substring in table
Hi Katharina, You can make use of table indexing to get that data you want. I’ll use a simple example below to illustrate the o...

3 years ago | 2

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Retime timetable out of bounds
Hi Rub, First, about your code examples I have some suggestions. I saw you used datenum in your first post. It is good that you...

3 years ago | 1

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