-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 18/09/2015 11:13 AM, Erich Neuwirth wrote: > Let me add a little bit here: > > When using math formulas, one should know about the parsing rules > form complex expression which do not have all the necessary > parenthesis. > > Different systems do have different parings rules. In the case of > a^b^c, the expression is ambiguus because (as mentioned in a > previous mail) in general (a^b)^c != a^(b^c) To avoid unintended > consequences, just us parentheses and you will get the right > result. in the case of -a^b The question is the order of precedence > of unary - and binary ^. > > In Excel, -2^2=4, but 0-2^2=-4 > > Reason: For Excel, unary - is stronger than the power operator, but > binary minus is weaker. > > My feeling is that too many people are bashing spreadsheets for the > wrong reason. Spreadsheets ca do things R cannot do: Automatic > recalculation when input changes,
Shiny is implemented in R and it has this. > and visual point and click modelling of dependencies. I'm not exactly sure what you mean here, but I think you're probably right on this one, in that it is a user-interface issue. People can implement front-ends to R that do just about anything, but those aren't part of R. Duncan Murdoch > The calculation engine of Excel admittedly has some weak points. > > That is the reason why I wrote RExcel which gives you all the > advantages of the spreadsheet interface and allows you to use the R > calculation within this interface whenever needed. > > > > > ______________________________________________ R-help@r-project.org > mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the > posting guide http://www.R-project.org/posting-guide.html and > provide commented, minimal, self-contained, reproducible code. > -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2 Comment: GPGTools - https://gpgtools.org iQEcBAEBCgAGBQJV/FRAAAoJEHE2Kz23YMZygz0H/2TZEQk2JOS8GQc5jvSXTk5+ qrgROnpgTTZwCX7rh0vPCDTGXSjAxgJikACYxGVWo/jkQKpoIkqcyrk7KnTXkPXG fmvQ6gkJ8nq7UJ7la4alThtmrBdNhkz2xgvVn3aZIItRwRhgRT2P7f8whi/Ia5IN CEpJyEg0ymrlVNMG8ncmAgAyebayeJDesJNPma7x7Hw0g00COQ9ZvD7U8joHgIGn 4Tic2nzlcK/ZItz3WQBcOdkqrVMCX5XcsZC6XOPMZyGPk+jIUA1qq7pQovMLWKeq 7JzH6xm6YeQ41QN4AbZyxmIZ8LvonT65MhQpS89hgGbROCZ49nUFquMcZn/Exj4= =e1J7 -----END PGP SIGNATURE----- ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.