git | 2beards 2beards

5 Dec 2011

A mongodb map reduce example for calculating standard deviation

By hendrik tagged as git, mongodb, wordpress.

On 5 Dec 2011

I wanted to scan some shares in a mongo db I populated recently. Specifically I was looking for shares with a bit of activity, hoping that they would yield wider trading channels. To find these shares I came up with a simple map/reduce job which calculates the standard deviation for each share since a specified date, and then prints out shares with a minimum standard deviation to the console. So for a real-world sample of what you can do with mongodb map reduce, go have a look. Btw, in order to embed a file in a git repo in a…read more

15 Nov 2011

Completely purging sensitive files from a git repo

By michael tagged as devjournal, git, mongoid, omniauth, rails.

On 15 Nov 2011

Completely purging sensitive files from a git repo Say for instance you want to open source a private repo with files containing sensitive information. You can effectively purge a file from a git repo as well as all history by running Remember to do this for each branch in your repo. Then do: More detail here

About us

hendrik

Hendrik's been in the software development game for a tenth of a century and a third of his life. In the Microsoft arena he has worked extensively with ASP.net MVC, WCF and WF. A little bit of Biztalk too, but he doesn’t like to talk about it. For his own ventures, he really enjoys working with technologies like ruby, node.js and coffeescript. He tried several web ventures, and has the battle scars to prove it. He's convinced that someday, somehow one of his pet projects will be be successful. At the very least it keeps him versed with the latest technologies.

michael

Michael has been developing software for over 9 years. He has been a C# programmer for quite a few of them, but has luckily been enlightened enough to become a open source zealot the last few years. The most loved tools in his utility belt are Ruby and Rails, Linux, MongoDB, Vim, jQuery and Coffeescript. He's interested in all manner of science and technology, but tends to dwell on things like elegant and eccentric programming languages, machine learning and statistics, web development, internet startups and civic hacking. When he's not sitting in front of the computer he likes pulling faces to amuse his baby son, apologising to his wonderful wife for sitting in front of computer all day or arguing endlessly with friends, family, colleagues and random strangers. He lives next to the beach in Muizenberg, Cape Town and loves it.

A mongodb map reduce example for calculating standard deviation

Completely purging sensitive files from a git repo

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About us

hendrik

michael