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Date:         Thu, 2 Jul 1998 16:30:03 +0200
Reply-To:     ANavodnik@SRC.SI
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         Andrej Navodnik <ANavodnik@SRC.SI>
Subject:      Re: character to numeric
Content-type: text/plain; charset=us-ascii

Andrej Navodnik@SRC 02.07.98 16:30

Hi Lynn,

I have used the idea from Jack Hamilton <jack_hamilton@HCCOMPARE.COM> and wrote a macro to change character variables to numeric. You can also specify a list of character variables which should not be changed using exclude parameter. All character variables should be in such format that can be read using BEST. informat.

data a; length a1 a2 a3 a4 $ 8 n1 n2 8; a1='1'; a2='2'; a3='3'; a4='4'; n1=1; n2=2; run;

data x; set a;

options nomprint nomtrace;

/* Description: Convert character variables to numeric

Usage: ds_in - input dataset ds_out - output dataset exclude - list of character variables which should not be transformed

*/ %macro convert(ds_in, ds_out, exclude); %let ds_in = %upcase(&ds_in); %let exclude = %upcase(&exclude); %if %sysfunc(exist(&ds_in,data)) gt 0 %then %do; %let dsid = %sysfunc(open(&ds_in,i)); %if &dsid gt 0 %then %do; %let firstvar = 1; %let nvars = %sysfunc(attrn(&dsid,NVARS)); proc sql; create table &ds_out as select %do i = 1 %to &nvars; %let varname = %sysfunc(varname(&dsid,&i)); %let index = %sysfunc(index(&exclude,%upcase(&varname))); %if %upcase(%sysfunc(vartype(&dsid,&i)))=C and &index = 0 %then %do; %if &firstvar = 1 %then %do; input(&varname,best.) as &varname %let firstvar = 0; %end; %else %do; , input(&varname,best.) as &varname %end; %end; %else %do; %if &firstvar = 1 %then %do; &varname as &varname %let firstvar = 0; %end; %else %do; , &varname as &varname %end; %end; %end; %let rc=%sysfunc(close(&dsid)); from &ds_in; quit; %end; %else %do; %put ERROR: Dataset &ds_in could not be opened.; %end; %end; %else %do; %put WARNING: Dataset &ds_in does not exist.; %end; %mend;

/* change all character variables */ %convert(a,c);

/* change all character variables except variable a1 */ %convert(a,c,a1); %convert(a,c,a3); %convert(a,c,a3 a4); %convert(a,c,a2 a3 a4);

/* change all variables, put the result in the same dataset */ %convert(x,x);

Kind regards, Andrej

Andrej Navodnik SRC INFO d.o.o. Trzaska 18 1000 Ljubljana Slovenia e-mail:

Jack Hamilton <jack_hamilton@HCCOMPARE.COM>, datum: 01.07.98 18:50:58

Prejemnik: SAS-L@UGA.CC.UGA.EDU V vednost: (tajno: Andrej Navodnik/SRC) Zadeva: Re[2]: character to numeric

It would be easier to do that using PROC SQL. You could use a statement of the form:

select input(abc, best.) as abc

which eliminates a lot of renaming. I think I'll put that in my WUSS Coder's Corner paper about the uses of the data dictionary.

"Berryhill, Timothy" <TWB2@PGE.COM> wrote:

>No. >Someone could write a macro to: 1) set the view SASHELP.VCOLUMN and get the >list of variables in the dataset, 2) write a input dataset rename option to >rename them all to temporary names, 3) define arrays of the original and >tempory names (the "original" names should default to numerics so no LENGTH >statement required to force numeric), 4) write a DO loop and assignment >statement to assign the temporary variables to the original variables (use >the INPUT function or accept the notes about forced conversion), and 5) >write an output dataset drop option to get rid of the temporary names. It >would take a while to get it debugged and working.

Tim Berryhill - Contract Programmer and General Wizard TWB2@PGE.COM or Frequently at Pacific Gas & Electric Co., San Francisco The correlation coefficient between their views and my postings is slightly less than 0 > ---------- > From: Lynn Nicole Lethbridge[SMTP:lynnl@IS.DAL.CA] > Reply To: Lynn Nicole Lethbridge > Sent: Monday, June 29, 1998 10:51 AM > To: SAS-L@UGA.CC.UGA.EDU > Subject: character to numeric > > Hi there > > Is there a quick way in SAS to change all of the variables in my dataset > (there are just over a hundred) from character variables to numeric > variables. > > Thanks very much for your time. > > Lynn >

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