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More R for math
Intro A real quick post about a couple of math (matrix) details, and a trick with rational numbers with R. Inverse of a Matrix Mathematically, getting to the inverse of an “nxn” matrix A means finding an nxn matrix B such that A • B = I, where I is the nxn Identity matrix. Easier…
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Learning about Computing Errors
Intro As part of the courses I am taking, I learned about something I guess I, as a “computer engineer”, should have come across earlier; but well, it would seem I didn’t. I’ll just show 3 examples anyone can easily find out there on the Internet, of things that happen with floating point operations. Obviously…
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On Sampling
In a past exercise (the one on a simplified visualization of Netflows), I had a very big file, and I wanted to extract a subset of the data to demo a visualization. The first part of the entry was about a way to divide a big file into smaller chunks, and extract samples with a…