Effacer les filtres
Effacer les filtres

Reading large .csv data with 12 million rows

34 vues (au cours des 30 derniers jours)
Ganesh Naik
Ganesh Naik le 10 Nov 2021
Commenté : Mathieu NOE le 16 Déc 2021
Hi all, I have .CSV file with 14 columns and around 12 million rows. I would like to read the data and use it for further analysis. When I use "readtable" command it reads only first two columns with all the information but fails to read other column data. Is there anyway I can read the entire dataset once?
Thanks in advance.
  3 commentaires
Ganesh Naik
Ganesh Naik le 16 Déc 2021
Hi Mathieu thanks for your message. I have solved the problem using the following method:
1) I have used "Split CSV" program to split the original CSV files into 12 sub-CSV files (each one million rows)
2) Read each CSV data as:
data1 = readtable('Data-1.csv');
data2 = readtable('Data-2.csv');
data12 = readtable('Data-12.csv');
3) Combine the final file as:
Final_data = [data1; data2;data3; data4;data5; data6;data7; data8;data9; data10;data11; data12];
This created a large table for me (on the fly) at workspace and each time loading the above files dont take much memory. It worked for me, but I believe there maybe better alternative methods.
Mathieu NOE
Mathieu NOE le 16 Déc 2021
ok glad you havefound a workaround ! :)

Connectez-vous pour commenter.

Réponses (1)

Sivani Pentapati
Sivani Pentapati le 1 Déc 2021
Hi Ganesh,
You can try using readmatrix in place of readtable. Other workaround is to convert the 'csv' files into 'mat' files and save them with '-v7.3' option. Please refer to this answer for more information.
  1 commentaire
Ganesh Naik
Ganesh Naik le 16 Déc 2021
Dear Sivani, I have solved the problem using SplitCSV method, reading each file and combining the data (I have explained my method above). It worked for me.

Connectez-vous pour commenter.


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by