"Sean Davis" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED]
> > I need urgently your assistance!!! > > I need a global variable in R. The variable ought to be known for every > > functions and subfunctions. It is only to comparison purposes of the > > numeric algorithms. Is there a possibility? > > > > please answer in german if possible. Es tut mir leid. Ich kann Deutsch nicht sprechen. > > a <- 1 If you make that assignment inside a function, it won't be known outside the funtion, so "a" is not really global here. Global assignment x <<- 5 ?"<<-" BUT, be aware of these cautions about the use of global variables: "I wish <<- had never been invented, as it makes an esoteric and dangerous feature of the language *seem* normal and reasonable. If you want to dumb down R/S into a macro language, this is the operator for you." -- Bill.Venables, R-Help, July 30, 2001 #thomas (tlumley), R-Help, Jan 24, 2001 This is one of the acceptable uses of <<-, as shown in demo(scoping). <<- is useful for modifying a variable that you know exists in the enclosing environment. Most of the problems come from people trying to use it to modify things in a parent environment or in the global environment. Also see Section 13.3 "Global Data" in "Code Complete 2" (http://www.cc2e.com/) including: - Common Problems with Global Data - Use Global Data Only as a Last Resort - How to Reduce the Risks of Using Global Data efg ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
