In the documentation of sapply and replicate there is a warning regarding using ... Now, I can accept it as such, but would like to understand what is behind it. So I\'ve created this little contrive
I have a large MySQL database, lets call it live_db, which I want to replicate on the same machine to provide a test system to play around with (test_db), including table structure and data.
I need a sequence of repeated numbers, i.e. 1 1 ... 1 2 2 ... 2 3 3 ... 3 etc. The way I implemented this was:
I have created a replica Set with 4 MongoD running. port: 2017, 2018, 2019, 2020 Very standard.I followed the instruction as in the documentation.
I would like to stress test my database, which is a hospital patient database. The current one is 2 GB. I would like to have a 100GB database, so I would like do the following:
I want to create a series of lists,开发者_高级运维 all of varying lengths. Each list will contain the same element e, repeated n times (where n = length of the list).
I would like to checkout a read only SVN projects (e.g. from Codeplex) to a folder on my local disk, open the solution (let\'s say I am getting Dotnetnuke and open it\'s solution, add some projects to
When programming within the R environment I used rep(\"[35,40)\",1020). This should give me a list with 1020 times \"[35,40)\". However, the result contains only 1019 of these elements.
Ok, I understand perl hash slices, and the \"x\" operator in Perl, but can someone explain the following code example from here (slightly simplified)?
df <- data.frame(var1 = c(\'a\', \'b\', \'c\'), var2 = c(\'d\', \'e\', \'f\'), freq = 1:3) What is the simplest way to expand each row the first two columns of the data.frame above, so that each
加载中,请稍侯......