How to convert string to datetime format in parquet file format within parquet datastore?
26 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Maitreyee Dey
el 14 de Jul. de 2020
The below is the sample parquet datastructure that i am using.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/331775/image.png)
This is the structure of the data. Where both the date and time are in string format. This is the data that have been converted in csv to parquet. I have tried many times to convert second and third column into datetime format. So that I can write some query to operate/plot on perticular duration for analysis.
So the question is how to convert the string into second and third column into datetime format in parquet file format?
I am using Matlab 2020a.
Many Thanks in advance!
0 comentarios
Respuesta aceptada
Stephen23
el 15 de Jul. de 2020
Editada: Stephen23
el 15 de Jul. de 2020
>> D = {'2020/1/1' ;'2020/1/1' ;'2020/1/1' };
>> T = {'00:01:0:0';'00:01:0:60';'00:01:0:320'};
Method one: sscanf and duration:
>> M = sscanf(sprintf(' %s:',T{:}),'%f:',[4,Inf]).';
>> dt = datetime(D,'InputFormat','yyyy/M/d') + duration(M(:,1),M(:,2),M(:,3),M(:,4))
dt =
01-Jan-2020 00:01:00
01-Jan-2020 00:01:00
01-Jan-2020 00:01:00
>> dt.Second % check the milliseconds:
ans =
0
0.0600
0.3200
Method two: regexprep:
>> C = strcat(D,'@',regexprep(T,{':(\d)$',':(\d\d)$'},{':00$1',':0$1'}));
>> dt = datetime(C,'InputFormat','yyyy/M/d@H:m:s:SSS')
dt =
01-Jan-2020 00:01:00
01-Jan-2020 00:01:00
01-Jan-2020 00:01:00
>> dt.Second % check the milliseconds:
ans =
0
0.0600
0.3200
Más respuestas (0)
Ver también
Categorías
Más información sobre Data Type Conversion en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!