In a data.frame (or data.table), I would like to "fill forward" NAs with the closest previous non-NA value. A simple example, using vectors (instead of a data.frame ) is the following: ...

I have a script which will be run interactively by non-technical users. The script writes status updates to STDOUT so that the user can be sure that the script is running OK. ...

Are there any editors that can edit multi-gigabyte text files, perhaps by only loading small portions into memory at once? It doesn't seem like Vim can handle it =( ...

I've made an Android application that is available on Google Play. Now I want to add some more formatting to my app description (eg. indent, links, lists..). But I cannot find any website where possible formatting is listed. Google Help pages cannot help me either on this subject. There exists a lot...

I've just inherited a java application that needs to be installed as a service on XP and vista. It's been about 8 years since I've used windows in any form and I've never had to create a service, let alone from something like a java app (I've got a jar for the app and a single dependency jar - log4j...

I'm reading "Introduction to Algorithm" by CLRS. In chapter 2, the authors mention "loop invariants". What is a loop invariant? ...

I need to parse the query string www.mysite.com/default.aspx?dest=aboutus.aspx . How do I get the dest variable in JavaScript? ...

I'd like to use a property on my ViewModel to toggle which icon to display without creating a separate computed property of the inverse. Is this possible? ...

I know this question was asked many times here, but I can't find a solution to my problem. I'm trying to save image to the folder in .net c# but get this exception: ...

My computer went dead and now one of my git repositories is broken. When I try to checkout master it tells me: 15 Answers ...