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John Sorkin

2006-Jul-03 11:39 UTC

[R] macro facility in R

R 2.2 on windows XP
I have a dataset with multiple columns. Some of the columns represent
independent variables, some represent dependent variables. I would like
to run the same analyses on a fixed set of independent variables,
changing only the dependent variable, e.g.
y1-y2=x1+x2+x3
y3-y4=x1+x2+x3
y5-y6=x1+x2+x3, etc.
I know I can write a function to perform the analyses, however in order
to make the analyses easy to do, I really need a macro scripting
language that will allow preprocessing of the function and substitution
of macro variables with parameters passed to the macro, i.e. I need
someting akin to the macro facility in SAS. Is there a macro facility
that I can use with R? I have tried help.search("macro") and did not
have any success.
Thanks,
John  

John Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
Baltimore VA Medical Center GRECC,
University of Maryland School of Medicine Claude D. Pepper OAIC,
University of Maryland Clinical Nutrition Research Unit, and
Baltimore VA Center Stroke of Excellence

University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524

410-605-7119
jsorkin at grecc.umaryland.edu

Peter Dalgaard

2006-Jul-03 12:13 UTC

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[R] macro facility in R

"John Sorkin" <jsorkin at grecc.umaryland.edu> writes:
> R 2.2 on windows XP
(that's a bit old...)
> I have a dataset with multiple columns. Some of the columns represent
> independent variables, some represent dependent variables. I would like
> to run the same analyses on a fixed set of independent variables,
> changing only the dependent variable, e.g.
> y1-y2=x1+x2+x3
> y3-y4=x1+x2+x3
> y5-y6=x1+x2+x3, etc.
> I know I can write a function to perform the analyses, however in order
> to make the analyses easy to do, I really need a macro scripting
> language that will allow preprocessing of the function and substitution
> of macro variables with parameters passed to the macro, i.e. I need
> someting akin to the macro facility in SAS. Is there a macro facility
> that I can use with R? I have tried help.search("macro") and did
not
> have any success.
> Thanks,
> John  
Some people have indicated that they might want to try their hand and
write a macro facility for R, at some time in the future. (There are
some parts of the R internals that would benefit from such a facility
too).

Meanwhile, update() is your friend.

mdl <- lm(y1-y2 ~ x1+x2+x3,....)
summary(mdl)
summary(update(mdl, y3 - y4 ~ .))
 ...etc...


-- 
   O__  ---- Peter Dalgaard             ?ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907

Duncan Murdoch

2006-Jul-03 12:15 UTC

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[R] macro facility in R

On 7/3/2006 7:39 AM, John Sorkin wrote:> R 2.2 on windows XP
> I have a dataset with multiple columns. Some of the columns represent
> independent variables, some represent dependent variables. I would like
> to run the same analyses on a fixed set of independent variables,
> changing only the dependent variable, e.g.
> y1-y2=x1+x2+x3
> y3-y4=x1+x2+x3
> y5-y6=x1+x2+x3, etc.
> I know I can write a function to perform the analyses, however in order
> to make the analyses easy to do, I really need a macro scripting
> language that will allow preprocessing of the function and substitution
> of macro variables with parameters passed to the macro, i.e. I need
> someting akin to the macro facility in SAS. Is there a macro facility
> that I can use with R? I have tried help.search("macro") and did
not
> have any success.
I think the substitute function in R does most of what you would want 
from a macro facility.

For example,

 > analyze <- function(dependent, data) {
+   formula <- as.formula(substitute(dep ~ x1 + x2 + x3,
+                         list(dep=substitute(dependent))))
+   lm(formula=formula, data=data)
+ }
 >
 > dat <- data.frame(y = rnorm(10)+1:10, x1=rnorm(10)+1:10, 
x2=rnorm(10), x3=rnorm(10))
 >
 > analyze(y, dat)

Call:
lm(formula = formula, data = data)

Coefficients:
(Intercept)           x1           x2           x3
      1.1256       0.8248       0.1671      -0.1907


I used substitute twice:  the inner call gets the unevaluated expression 
that was passed as "dependent"; the outer one puts that in place of
the
"dep" variable.

Duncan Murdoch

Chuck Cleland

2006-Jul-03 12:16 UTC

head link

[R] macro facility in R

John Sorkin wrote:> R 2.2 on windows XP
> I have a dataset with multiple columns. Some of the columns represent
> independent variables, some represent dependent variables. I would like
> to run the same analyses on a fixed set of independent variables,
> changing only the dependent variable, e.g.
> y1-y2=x1+x2+x3
> y3-y4=x1+x2+x3
> y5-y6=x1+x2+x3, etc.
> I know I can write a function to perform the analyses, however in order
> to make the analyses easy to do, I really need a macro scripting
> language that will allow preprocessing of the function and substitution
> of macro variables with parameters passed to the macro, i.e. I need
> someting akin to the macro facility in SAS. Is there a macro facility
> that I can use with R? I have tried help.search("macro") and did
not
> have any success.
Also try RSiteSearch("macro", restrict="functions").  And
have a look at
Thomas Lumley's column in the following issue of Rnews:

http://cran.r-project.org/doc/Rnews/Rnews_2001-3.pdf
> Thanks,
> John  
> 
> John Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> Baltimore VA Medical Center GRECC,
> University of Maryland School of Medicine Claude D. Pepper OAIC,
> University of Maryland Clinical Nutrition Research Unit, and
> Baltimore VA Center Stroke of Excellence
> 
> University of Maryland School of Medicine
> Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> 
> 410-605-7119
> jsorkin at grecc.umaryland.edu
> 
> ______________________________________________
> R-help at 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
> 
-- 
Chuck Cleland, Ph.D.
NDRI, Inc.
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 512-0171 (M, W, F)
fax: (917) 438-0894

Gabor Grothendieck

2006-Jul-03 13:01 UTC

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[R] macro facility in R

Try this:

# test data
set.seed(1)
mat <- matrix(rnorm(900), nc = 9)
colnames(mat) <- letters[1:9]
DF <- as.data.frame(mat)

# run lm's and display coefs
for(i in seq(1, 5, 2)) {
	dat <- cbind(z = DF[,i] - DF[,i+1], DF[7:9])
	Coef <- coef(lm(z ~., dat))
	cat("y: DF[,", i, "] - DF[,", i+1, "], coef: ",
Coef, "\n")
}




On 7/3/06, John Sorkin <jsorkin at grecc.umaryland.edu>
wrote:> R 2.2 on windows XP
> I have a dataset with multiple columns. Some of the columns represent
> independent variables, some represent dependent variables. I would like
> to run the same analyses on a fixed set of independent variables,
> changing only the dependent variable, e.g.
> y1-y2=x1+x2+x3
> y3-y4=x1+x2+x3
> y5-y6=x1+x2+x3, etc.
> I know I can write a function to perform the analyses, however in order
> to make the analyses easy to do, I really need a macro scripting
> language that will allow preprocessing of the function and substitution
> of macro variables with parameters passed to the macro, i.e. I need
> someting akin to the macro facility in SAS. Is there a macro facility
> that I can use with R? I have tried help.search("macro") and did
not
> have any success.
> Thanks,
> John
>
> John Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> Baltimore VA Medical Center GRECC,
> University of Maryland School of Medicine Claude D. Pepper OAIC,
> University of Maryland Clinical Nutrition Research Unit, and
> Baltimore VA Center Stroke of Excellence
>
> University of Maryland School of Medicine
> Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
>
> 410-605-7119
> jsorkin at grecc.umaryland.edu
>
> ______________________________________________
> R-help at 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
>

Michael Prager

2006-Jul-03 13:49 UTC

head link

[R] macro facility in R

Here is one user's perspective on this, with no pretense of being 
definitive.  In the S (R) world, the expression "computing on the 
language" is used to encompass what I would call the tasks of macro 
programming.  This involves uses of various S (R) expressions that 
convert between names of objects and the object themselves; pasting 
together expressions out of fixed and variable text; and executing 
them.  I for one have been able to do everything I could do in the SAS 
macro language, but it has taken trial and error.

To get started, you might consult section 3.5 of S Programming by 
Venables and Ripley.

MHP

John Sorkin wrote on 7/3/2006 7:39 AM:> R 2.2 on windows XP
> I have a dataset with multiple columns. Some of the columns represent
> independent variables, some represent dependent variables. I would like
> to run the same analyses on a fixed set of independent variables,
> changing only the dependent variable, e.g.
> y1-y2=x1+x2+x3
> y3-y4=x1+x2+x3
> y5-y6=x1+x2+x3, etc.
> I know I can write a function to perform the analyses, however in order
> to make the analyses easy to do, I really need a macro scripting
> language that will allow preprocessing of the function and substitution
> of macro variables with parameters passed to the macro, i.e. I need
> someting akin to the macro facility in SAS. Is there a macro facility
> that I can use with R? I have tried help.search("macro") and did
not
> have any success.
> Thanks,
> John  
>
> John Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> Baltimore VA Medical Center GRECC,
> University of Maryland School of Medicine Claude D. Pepper OAIC,
> University of Maryland Clinical Nutrition Research Unit, and
> Baltimore VA Center Stroke of Excellence
>
> University of Maryland School of Medicine
> Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
>
> 410-605-7119
> jsorkin at grecc.umaryland.edu
>
> ______________________________________________
> R-help at 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
>   
-- 
Michael H. Prager, Ph.D.
Population Dynamics Team
NOAA Center for Coastal Habitat and Fisheries Research
NMFS Southeast Fisheries Science Center
Beaufort, North Carolina  28516  USA
http://shrimp.ccfhrb.noaa.gov/~mprager/

Thomas Lumley

2006-Jul-03 16:32 UTC

head link

[R] macro facility in R

On Mon, 3 Jul 2006, John Sorkin wrote:> R 2.2 on windows XP
> I have a dataset with multiple columns. Some of the columns represent
> independent variables, some represent dependent variables. I would like
> to run the same analyses on a fixed set of independent variables,
> changing only the dependent variable, e.g.
> y1-y2=x1+x2+x3
> y3-y4=x1+x2+x3
> y5-y6=x1+x2+x3, etc.
Other people have mentioned my defmacro() function in R-news, however when 
I have to do this sort of thing I usually use substitute or bquote

For example

for(i in 1+(1:5)*2){
   A<-as.name(paste("y",i,sep=""))
   B<-as.name(paste("y",i+1,sep="")
   eval(bquote(lm(I(.(A)-.(B))~x1+x2+x3,data=dat)))
}


 	-thomas

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