I wrote this R function which caches the Inverse of a matrix in memory to avoid recalculation when the inverse is requested for the same matrix again or calculate a new inverse if the matrix changes and caches the result in memory. Below is the code and can be copied and tested in R. ##Function […]
In this post, I am going to show functions that l have written to work on a data in files which contain observation of pollutants monitored at different locations. The data is a .csv file and there are 332 monitors which are set up at different locations. Sample of data looks like below “Date”,”sulfate”,”nitrate”,”ID” “2003-01-01”,NA,NA,1 […]
Remember those college days when your calculus professor will ask questions such as prove that cosine 90 is zero? No? Ok, take it easy, its not coming back to haunt you anymore. Have you ever thought writing SQL stored procedure with or without Begin End will execute differently? To be frank, I have never thought […]
SQL Server 2012 has introduced a nice function EOMONTH which gives end of month for a given date. How do you know how many days are in a month in real life? Well, for me, l still use the childhood song “30 days has September, April, June and November. All the rest has 31 except […]