Dear all, Today I was reading the Function Reference when it confused me that the argument for var() or sd() should be a list or a series. However, having a one-column matrix (named MAT) at hand, I tried scalar sdM = sd(MAT) and obtained a correct result. When a matrix with multiple columns was fed in, an error was not slow to arrive. Does it mean that these functions fully support one-column matrices as arguments? If yes, could you mention it in the Function Reference? If it is a slippery slope, could you state it in the Reference that “for matrices other than n×1, it produce an error, whereas for n×1 matrices it will yield the result, which, however, has something to do with matrix-series conversion and it is strongly advised to explicitly prepare such a series before”? (Of course, the latter is so undesirable, especially when the length of the one-column matrix differs from the length of the dataset!) -- Yours sincerely, | С уважением, Andreï V. Kostyrka. | Андрей Викторович Костырка. http://kostyrka.ru, http://kostyrka.ru/blog