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private[this] vs private
In Scala I see such feature as object-private variable. From my not very rich Java background I learnt to close everything (make it private) and open (provide accessors) if necessary. Scala introduces even more strict access modifier. Should I always use it by default? Or should I use it only in som...
Cutting the videos based on start and end time using ffmpeg
I tried to cut the video using the start and end time of the video by using the following command
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How to do an update + join in PostgreSQL?
Basically, I want to do this:
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Unable to cast object of type 'System.DBNull' to type 'System.String`
I got the above error in my app. Here is the original code
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How to Concatenate Numbers and Strings to Format Numbers in T-SQL?
I have the following function
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How do I format a number with commas in T-SQL?
I'm running some administrative queries and compiling results from sp_spaceused in SQL Server 2008 to look at data/index space ratios of some tables in my database. Of course I am getting all sorts of large numbers in the results and my eyes are starting to gloss over. It would be really conveni...
How to kill a child process after a given timeout in Bash?
I have a bash script that launches a child process that crashes (actually, hangs) from time to time and with no apparent reason (closed source, so there isn't much I can do about it). As a result, I would like to be able to launch this process for a given amount of time, and kill it if it did not re...
Cannot pass null argument when using type hinting
The following code:
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How to initialize const member variable in a class?
When I am trying to initialize the const member variable t with 100. But it's giving me the following error:
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Apply a function to every row of a matrix or a data frame
Suppose I have a n by 2 matrix and a function that takes a 2-vector as one of its arguments. I would like to apply the function to each row of the matrix and get a n-vector. How to do this in R?
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