topic Re: Array all variables in SAS Programming

Array all variables

hhchenfx — Sat, 23 Jan 2016 03:19:11 GMT

Hi,

I have a data of 100+ variables.

I want to apply the simple operation to all variable: If variable_value >10000 then variable_value=.;

I dont want to repeat this line for 100+ line.

So is there any way to array all variables without listing their name so I can get it done?

Also, if I have the first 3 variable that should be excluded from the rule , how can I array all except for them. I can list their 3 name for excluding.

Thank you for your help.

data have;

input var1 a b c;
cards;
1 10 2 1000000
2 10 3 1
3 10 4 0
4 . 100000 1000000
5 100000 1 2
6 10 2 300000
run;

Re: Array all variables

Reeza — Sat, 23 Jan 2016 03:54:55 GMT

Its easier if it was all, but you could list the first and last with -- to separate them.

Firstvar--lastvar;

Other options include querying the SAS help table vcolumn to get the variable list. Thats been illustrated on the forums quite a bit.

Re: Array all variables

Jagadishkatam — Sat, 23 Jan 2016 03:59:25 GMT

I am not sure if it is possible for us to do the arrays without the variable names. We need the variable names in arrays. However, alternatively what we could do is we could get the list of all other variable names except the names which are not required (3 variable what you mentioned) into a macro variable.

Something like below

after you create the dataset with all the variables and data

write

proc sql;

select distinct name into : vars separated by ' ' from dictionary.columns where memname='dataset name' and name not in ('x1','x2','x3');

select count(distinct name) into : cnt from dictionary.columns where memname='dataset name' and name not in ('x1','x2','x3');

quit;

we get list of all variable names excluding the three variables into vars macro variable separated by blank space. In teh cnt macro variable we get the number of variable count.

then write the arrays as below

data arrays;

set have;

array vr(&cnt) &vars;

do i = 1 to &cnt;

If vr(i) >10000 then vr(i)=.;

end;

run;

Re: Array all variables

PGStats — Sat, 23 Jan 2016 04:16:00 GMT

If the list of variables is fairly long and the list of excluded variables is short, it would be simpler to list the latter explicitly. For example, to exclude var1 and b :

data want;
set have;
array _v{*} _numeric_;
do _i = 1 to dim(_v);
    if upcase(vname(_v{_i})) not in ("VAR1", "B") then
	   if _v{_i} > 10000 then call missing(_v{_i});
	end;
drop _i;
run;

Re: Array all variables

Tom — Sat, 23 Jan 2016 04:48:22 GMT

If they really are the first three variables then just index over the array starting with the index set to 4.

data want;
  set have;
  array _all _numeric_;
  do _n_=4 to dim(_all);
     if _all(_n_) > 10000 then _all(_n_)=.;
  end;
run;

If they aren't the first three, you can make them the first three by adding another SET statement with a KEEP= option.

data want;
  set have(keep=var1 var2 var3);
  set have;
  array _all _numeric_;
  do _n_=4 to dim(_all);
     if _all(_n_) > 10000 then _all(_n_)=.;
  end;
run;

Re: Array all variables

hhchenfx — Sat, 23 Jan 2016 05:29:01 GMT

These codes are awesome!

Very easy to follow.

So much thanks.

Re: Array all variables

data_null__ — Sat, 23 Jan 2016 19:04:02 GMT

If it is important to keep the variables in order as in @PGStats program does you can alternatevly built the variable list explicitly.

data have;
   input var1 a b c; 
   var3 = _n_*10;
   d = a;  
   var2 = var1*10;  
   cards;
1 10 2 1000000
2 10 3 1
3 10 4 0
4 . 100000 1000000
5 100000 1 2
6 10 2 300000
   run;
proc print;
   run;
proc transpose data=have(obs=0 drop=var: keep=_numeric_) out=vars;
   run;
proc sql noprint;
   select nliteral(_name_) into :varlist separated by ' ' from vars;
   quit;
%put NOTE: &=varlist;

data change;
   set have;
   array _x[*] &varlist;
   do _n_ = 1 to dim(_x);
      if _x[_n_] ge 1e5 then _x[_n_]=.;
      end;
   run;
proc print;
   run;