That is, R will repeat a vector to fit the space allocated if it isn’t already long enough. Guillaume’s own version doesn’t fit on one line but is a bit more sensible: x <- rep(0, n * n)Ĭolin Fay makes a more readable solution, taking advantage of matrix broadcasting. We can write down such a sequence and then reshape it. a one, then $n$ zeroes, another one, another $n$ zeroes and so on, finishing with the $n$th one. The three-dimensional identity matrix, for example, is It is a diagonal matrix of ones, with all off-diagonal entries equal to zero. The identity matrixĪs a quick reminder, the identity matrix is the linear algebraic equivalent of the number 1.
#Identity matrix code#
Taking the scenic route and learning along the way.Ĭrazy code golf, if you like. This R challenge is less about minimising your golf handicap, however, and more about showing off some features and functions in R that others might not know about. In code golf, programmers try to write an algorithm using the shortest programme possible, often exploiting lesser-known eccentricies of each programming language. HlhIM6mSrx- Guillaume Nicoulaud February 3, 2018
This was an interesting little challenge set by Guillaume Nicoulaud on Twitter.įind as many way you can to create the identity matrix with #rstats.
How many different ways are there to create an identity matrix in R?
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