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.dun...@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
[[alternative HTML version deleted]]
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