2015-09-08 22:55 GMT+02:00 Daniel Verite <dan...@manitou-mail.org>: > Pavel Stehule wrote: > > > rotate ~ sounds like transpose matrix, what is not true in this case. >
for me the relation rotation is exactly what \x does > > The various definitions that I can see, such as > http://dictionary.reference.com/browse/rotate > make no mention of matrices. It applies to anything that > moves around a pivot or axis. > > OTOH, the established term for the matrix operation you're > referring to appears to be "transpose", as you mention. > https://en.wikipedia.org/wiki/Transpose > > I notice that according to > http://www.thesaurus.com/browse/transpose > "rotate" is not present in the 25+ synonyms they suggest for > "transpose". > > In the above wikipedia article about matrix transposition, > "rotate" is also never used anywhere. > > "rotate matrix" does not exist for google ngrams, whereas > "transpose matrix" does. > https://books.google.com/ngrams > > Overall I don't see the evidence that "rotate" alone would > suggest transposing a matrix. > > Now it appears that there is a concept in linear algebra named > "rotation matrix", defined as: > https://en.wikipedia.org/wiki/Rotation_matrix > that seems quite relevant for 3D software. > > But as psql is not a tool for linear algebra or 3D in the first place, > who could realistically be deceived? > > > Best regards, > -- > Daniel Vérité > PostgreSQL-powered mailer: http://www.manitou-mail.org > Twitter: @DanielVerite >
