I used to use matrix in octave to store data from data set, in Java how can I do that? Assume I have 10-20 columns and large data, I don’t think
int [][]data;
would be the best option. Is nested map the only solution?
Share
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I used to use matrix in octave to store data from data set, in Java how can I do that? Assume I have 10-20 columns and large data, I don’t think
int [][]data;
would be the best option. Is nested map the only solution?
Depends on what you need to do. If you know the size of the lists, then an array is definitely ideal since it means you will have instant access (read/write time) to any position in the array, this is very useful for speed.
Maps are better if you dont know the size and it needs to be able to adapt.
And finally, as I discovered in a previous question, if you have a TON of data, and a lot of it will be “0” you might want to also consider using a Sparse Martrix