Currently, my macro is running to insert a constant number of rows:
%MACRO ADD_PERIOD;
%DO P = 1 %TO 39;
Would I be able to modify this macro or create a new macro to run this, not 39 times, but replace the number of loops with a variable I have from another table?
Thank you!
Use the call symput to turn that variable(my_var) into a macro variable(loop_var)
data _null_;
set your_table;
call symput("loop_var", my_var);
run;
and use & to resolve the macro variable into your code
%MACRO ADD_PERIOD;
%DO P = 1 %TO &loop_var;
You could also pass that macro variable as parameters into your macro.
%MACRO ADD_PERIOD(loop_var);
Related
I have a very simple request. Loop through a dataset, turning each observation into a macro variable, and then doing a comparison on that macro variable. here's what my code looks like:
%do n = 1 %to &i2.;
data want;
set have;
%if _N_ = &n. %then %do;
call symputx("Var1",var1);
call symputx("var2",var2);
%end;
run;
data want;
retain FinalCount
set have;
where Variable1="&var1.";
by SomeVariable
if first.SomeVariable then FinalCount=0;
if final="FINAL" then FinalCount+1;
if Finalcount=&var2. then Final_Samples=1;
finalCount=FinalCount;
run;
%end
The part that is failing in the _N_ = &n. section. I keep getting the error "Variable N has been defined as both character and numeric." Basically I just need to set each observation as a macro variable once to do the next comparison, and then move on to the next guy. So, if there's a better way of doing that, please let me know. Otherwise, could you help me figure out why that comparison is not working?
If you could explain your larger problem then you might get a better answer that does not require you to convert your data values into macro variables. Converting values to strings and then trying to compare them again introduces a number of sources of errors.
To your question of how to set macro variables based on the Nth observation in a dataset, try one of these.
If it supports the FIRSTOBS= and OBS= dataset options.
data _null_;
set have (firstobs=&n obs=&n);
call symputx("Var1",var1);
call symputx("var2",var2);
run;
If the dataset supports direct access then use that.
data _null_;
p = &n;
set have point=p;
call symputx("Var1",var1);
call symputx("var2",var2);
stop;
run;
If not then use an IF (not a macro %if).
data _null_;
set have ;
if _n_ = &n then do;
call symputx("Var1",var1);
call symputx("var2",var2);
stop;
end;
run;
Is there any form to keep variables with a doop loop in data step?
will be something as:
data test;
input id aper_f_201501 aper_f_201502 aper_f_201503 aper_f_201504
aper_f_201505 aper_f_201506;
datalines;
1 0 1 2 3 5 7
2 -1 5 4 8 7 9
;
run;
%macro test;
%let date = '01Jul2015'd;
data test2;
set test(keep=do i = 1 to 3;
aper_f_%sysfunc(intnx(month,&date,-i,begin),yymmn6.);
end;)
run;
%mend;
%test;
I need to iterate several dates.
Thank you very much.
You need to use macro %do loop instead of the data step do loop, which is not going to be valid in the middle of a dataset option. Also do not generate those extra semi-colons into the middle of your dataset options. And do include a semi-colon to end your SET statement.
%macro test;
%local i date;
%let date = '01Jul2015'd;
data test2;
set test(keep=
%do i = 1 %to 3;
aper_f_%sysfunc(intnx(month,&date,-i,begin),yymmn6.)
%end;
);
run;
%mend;
%test;
You can use the colon shortcut to reference variables with the same prefix, anything in front of the colon will be kept.
keep ID aper_f_2015: ;
There's also a hyphen when you have sequential lists
keep ID aper_f_201501-aper_f_201512;
You can use a macro but not sure it adds a lot of value here.
I have a bunch of character variables which I need to sort out from a large dataset. The unwanted variables all have entries that are the same or are all missing (meaning I want to drop these from the dataset before processing the data further). The data sets are very large so this cannot be done manually, and I will be doing it a lot of times so I am trying to create a macro which will do just this. I have created a list macro variable with all character variables using the following code (The data for my part is different but I use the same sort of code):
data test;
input Obs ID Age;
datalines;
1 2 3
2 2 1
3 2 2
4 3 1
5 3 2
6 3 3
7 4 1
8 4 2
run;
proc contents
data = test
noprint
out = test_info(keep=name);
run;
proc sql noprint;
select name into : testvarlist separated by ' ' from test_info;
quit;
My idea is then to just use a data step to drop this list of variables from the original dataset. Now, the problem is that I need to loop over each variable, and determine if the observations for that variable are all the same or not. My idea is to create a macro that loops over all variables, and for each variable counts the occurrences of the entries. Since the length of this table is equal to the number of unique entries I know that the variable should be dropped if the table is of length 1. My attempt so far is the following code:
%macro ListScanner (org_list);
%local i next_name name_list;
%let name_list = &org_list;
%let i=1;
%do %while (%scan(&name_list, &i) ne );
%let next_name = %scan(&name_list, &i);
%put &next_name;
proc sql;
create table char_occurrences as
select &next_name, count(*) as numberofoccurrences
from &name_list group by &next_name;
select count(*) as countrec from char_occurrences;
quit;
%if countrec = 1 %then %do;
proc sql;
delete &next_name from &org_list;
quit;
%end;
%let i = %eval(&i + 1);
%end;
%mend;
%ListScanner(org_list = &testvarlist);
Though I get syntax errors, and with my real data I get other kinds of problems with not being able to read the data correctly but I am taking one step at a time. I am thinking that I might overcomplicate things so if anyone has an easier solution or can see what might be wrong to I would be very grateful.
There are many ways to do this posted around.
But let's just look at the issues you are having.
First for looping through your space delimited list of names it is easier to let the %do loop increment the index variable for you. Use the countw() function to find the upper bound.
%do i=1 %to %sysfunc(countw(&name_list,%str( )));
%let next_name = %scan(&name_list,&i,%str( ));
...
%end;
Second where is your input dataset in your SQL code? Add another parameter to your macro definition. Where to you want to write the dataset without the empty columns? So perhaps another parameter.
%macro ListScanner (dsname , out, name_list);
%local i next_name sep drop_list ;
Third you can use a single query to count all of variables at once. Just use count( distinct xxxx ) instead of group by.
proc sql noprint;
create table counts as
select
%let sep=;
%do i=1 %to %sysfunc(countw(&name_list,%str( )));
%let next_name = %scan(&name_list,&i,%str( ));
&sep. count(distinct &next_name) as &next_name
%let sep=,;
%end;
from &dsname
;
quit;
So this will get a dataset with one observation. You can use PROC TRANSPOSE to turn it into one observation per variable instead.
proc transpose data=counts out=counts_tall ;
var _all_;
run;
Now you can just query that table to find the names of the columns with 0 non-missing values.
proc sql noprint ;
select _name_ into :drop_list separated by ' '
from counts_tall
where col1=0
;
quit;
Now you can use the new DROP_LIST macro variable.
data &out ;
set &dsname ;
drop &drop_list;
run;
So now all that is left is to clean up after your self.
proc delete data=counts counts_tall ;
run;
%mend;
As far as your specific initial question, this is fairly straightforward. Assuming &testvarlist is your macro variable containing the variables you are interested in, and creating some test data in have:
%let testvarlist=x y z;
data have;
call streaminit(7);
do id = 1 to 1e6;
x = floor(rand('Uniform')*10);
y = floor(rand('Uniform')*10);
z = floor(rand('Uniform')*10);
if x=0 and y=4 and z=7 then call missing(of x y z);
output;
end;
run;
data want fordel;
set have;
if min(of &testvarlist.) = max(of &testvarlist.)
and (cmiss(of &testvarlist.)=0 or missing(min(of &testvarlist.)))
then output fordel;
else output want;
run;
This isn't particularly inefficient, but there are certainly better ways to do this, as referenced in comments.
I am trying to figure out how to call a macro variable in a loop within a data step in SAS, but I am lost; so I have 14 macro variables and I have to compare each of them to the entries of a vector. I tried:
data work.calendrier;
set projet.calendrier;
do i=1 to 3;
if date= "&vv&i"D then savinglight = 1;
end;
run;
But it is not working. The variable vv1 up to vv3 are date variables. For instance this code works:
data work.calendrier;
set projet.calendrier;
*do i=1 to 3;
if date= "&vv1"D then savinglight = 1;
*end;
run;
But with the loop it can not resolve the macro variable.
If you want to reference a macro variable with a number index like vv1,vv2,vv3 you need to resolve &i first.
SAS has a separate macro processor that resolves values before they reach the data step processor.
Essentially, you need to add extra ampersands at the beginning of your macro variable:
&&vv&i -> &vv1 -> "Value of vv1"
&&vv&i -> &vv2 -> "Value of vv2"
&&vv&i -> &vv3 -> "Value of vv3"
What happens here is that SAS reads in the information after the ampersand until it finds a break. SAS then resolves && as a single &, it then continues reading across until it resolves &i as a numeric value. You're then left with your required &vvi variable.
A couple of sources about this interesting topic:
http://www2.sas.com/proceedings/sugi29/063-29.pdf
http://www.lexjansen.com/nesug/nesug04/pm/pm07.pdf
Macro variable references are resolved before SAS compiles and runs your data step. You need to first figure out how to do what you want using SAS statements then, if necessary, you can use macro code to help you generate those statements.
If you want to test if a variable's value matches one of a list of values then consider using the IN operator.
data work.calendrier;
set projet.calendrier;
savinglight = date in ("&vv1"d,"&vv2"d,"&vv3"d);
run;
you need to use a macro. Here's the basic approach:
%let vv1 = 9;
%let vv2 = 2;
%let vv3 = 10;
data have;
drop i;
do i = 1 to 5;
date = i;
output;
end;
run;
%macro test;
data test;
set have;
%do i=1 %to 3;
if date= &&vv&i then savinglight = 1;
%end;
run;
%mend test;
%test;
I defined a macro which get data of 1 day.
For example
%macro getOneday(stnd_d);
data _null_;
call symputx('numdate',&stnd_d.);
run;
data oneday&numdate;
set alldata;
where stdd = &stnd_d;
run;
%mend;
Now I want to loop that macro from start date to end date.
data _null_;
do i = '01mar2015'd to '30mar2015'd;
%getOneday(stnd_d = i)
end;
run;
I don't know how can I pass the date expression value to %getOneday() as a parameter.
I hope you understand that macro - getOneday would simply write all the code written inside it, to the data _null_ statement by replacing the %getOneday and since you cannot write a data step inside a data step, its throwing an error. You simply have to replace the data _NULL_ statement with a macro like below.
Also using date like that would not work as Macro would treat them as char, you will have to convert them into date format, before using them in %do loop.
%macro test;
data _null_;
date1='01mar2015'd;
date2='30mar2015'd;
call symputx("date1",date1);
call symputx("date2",date2);
run;
%put &date1.;
%put &date2.;
%do i = &date1. %to &date2.;
%getOneday(stnd_d = &i.)
%end;
%mend;
%test;