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How to get last N records with activerecord?
With :limit in query, I will get first N records. What is the easiest way to get last N records?
14 Answers
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Why is there no Char.Empty like String.Empty?
Is there a reason for this? I am asking because if you needed to use lots of empty chars then you get into the same situation as you would when you use lots of empty strings.
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Windows path in Python
What is the best way to represent a Windows directory, for example "C:\meshes\as" ? I have been trying to modify a script but it never works because I can't seem to get the directory right, I assume because of the '\' acting as escape character?
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Where can I find the “clamp” function in .NET?
I would like to clamp a value x to a range [a, b] :
9 Answers
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How can I scroll a web page using selenium webdriver in python?
I am currently using selenium webdriver to parse through facebook user friends page and extract all ids from the AJAX script. But I need to scroll down to get all the friends. How can I scroll down in Selenium. I am using python.
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Mercurial - all files that changed in a changeset?
How can you determine all the files that changed in a given changeset?
7 Answers
7
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Quickly reading very large tables as dataframes
I have very large tables (30 million rows) that I would like to load as a dataframes in R. read.table() has a lot of convenient features, but it seems like there is a lot of logic in the implementation that would slow things down. In my case, I am assuming I know the types of the columns ahead o...
How do I make a column unique and index it in a Ruby on Rails migration?
I would like to make a column unique in Ruby on Rails migration script. What is the best way to do it? Also is there a way to index a column in a table?
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