In this article I give a command line script for watermarking JPEG and PNG files with ImageMagick. Primary reason for me to write the script was the need of watermarking a large number of my own graphics files before posting them online as well as watermarking JPEGs and PNGs for ...

Suppose, you are given a list of two items, say one is called "a" and the other "b" and asked to find all the possible arrangements (also called permutations without repetition) of these items. All your arrangements should consist of exactly the number of ...

This article, and in particular PHP code it contains, is an outcome of my lack of patience with regards to making arrangements with repetition of finite set items. Recently, while solving a Probability problem, which eventually led to an infinite series, I reached a step which ...

If you look for a computer programming challenge, you'll certainly find a few decent ones implementing concepts Linear Algebra deals with. One of simpler operations, at least on the paper, one carries out on the matrix is switching rows and columns indices along the main ...