Most of what a devops person does is in fact development but it is of the non value adding variety. Basically a devops person spends the vast majority of their time configuring common off the shelf software, scripting this or that, etc.
A singular matrix is a matrix which has no inverse because its determinant is zero. If you recall, the inverse of a matrix is. 1/ ad-bc multiplied by: [ d -b ] [-c a ] If ad-bc = 0, then the inverse matrix would not exist because 1/0 is undefined, and hence it would be a singular matrix. E.g.
The size of a matrix is defined by the number of rows and columns that it contains. A matrix with m rows and n columns is called an m Ã n matrix or m-by-n matrix, while m and n are called its dimensions. For example, the matrix A above is a 3 Ã 2 matrix. Matrices which have a single row are called row vectors, and those which have a single column are called column vectors.