There is a?%LET statement in SAS: %let MVAR=population; Thus,?MVAR can be used
through entire program.
In R, I tried MAVR<-c("population"). The problem is that MAVR comes
with double quote "...." that I don't need. But
MVAR<-c(population) did NOT work out. Any way that double quote can be
removed as done in SAS when creating macro_var?
Thanks in advance for helps!
Amoy
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Don't know what `population` is, but a simple assignment MVAR <- population may provide what you need. Note, no c(). For example,> foo <- rnorm > foo(3)[1] -0.08093862 -0.87827617 1.52826914 /Henrik On Wed, Feb 3, 2016 at 9:41 AM, Amoy Yang via R-help <r-help at r-project.org> wrote:> There is a %LET statement in SAS: %let MVAR=population; Thus, MVAR can be used through entire program. > In R, I tried MAVR<-c("population"). The problem is that MAVR comes with double quote "...." that I don't need. But MVAR<-c(population) did NOT work out. Any way that double quote can be removed as done in SAS when creating macro_var? > Thanks in advance for helps! > Amoy > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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.
On 03/02/2016 12:41 PM, Amoy Yang via R-help wrote:> There is a %LET statement in SAS: %let MVAR=population; Thus, MVAR can be used through entire program. > In R, I tried MAVR<-c("population"). The problem is that MAVR comes with double quote "...." that I don't need. But MVAR<-c(population) did NOT work out. Any way that double quote can be removed as done in SAS when creating macro_var? > Thanks in advance for helps!R doesn't have a macro language, and you usually don't need one. If you are only reading the value of population, then MAVR <- population is fine. This is sometimes the same as c(population), but in general it's different: c() will remove some attributes, such as the dimensions on arrays. If you need to modify it in your program, it's likely more complicated. The normal way to go would be to put your code in a function, and have it return the modified version. For example, population <- doModifications(population) where doModifications is a function with a definition like doModifications <- function(MAVR) { # do all your calculations on MAVR # then return it at the end using MAVR } Duncan Murdoch
population is the field-name in data-file (say, tab). MVAR<-population takes
data (in the column of population) rather than field-name as done in SAS:? %let
MVAR=population;
In the following r-program, for instance, I cannot use ... tab$MVAR...or simply
MVAR itself?since MVAR is defined as "population" with double quotes
if using MVAR<-c("population")
On Wednesday, February 3, 2016 11:54 AM, Duncan Murdoch <murdoch.duncan
at gmail.com> wrote:
On 03/02/2016 12:41 PM, Amoy Yang via R-help wrote:>? There is a %LET statement in SAS: %let MVAR=population; Thus, MVAR can be
used through entire program.
> In R, I tried MAVR<-c("population"). The problem is that MAVR
comes with double quote "...." that I don't need. But
MVAR<-c(population) did NOT work out. Any way that double quote can be
removed as done in SAS when creating macro_var?
> Thanks in advance for helps!
R doesn't have a macro language, and you usually don't need one.
If you are only reading the value of population, then
MAVR <- population
is fine.? This is sometimes the same as c(population), but in general
it's different:? c() will remove some attributes, such as
the dimensions on arrays.
If you need to modify it in your program, it's likely more complicated.?
The normal way to go would be to put your code in a function, and have
it return the modified version.? For example,
population <- doModifications(population)
where doModifications is a function with a definition like
doModifications <- function(MAVR) {
? ? # do all your calculations on MAVR
? ? # then return it at the end using
? ? MAVR
}
Duncan Murdoch
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