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Axio Research Idea to Application via SAS Macro Language Reading Directories Bill Coar

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Presentation on theme: "Axio Research Idea to Application via SAS Macro Language Reading Directories Bill Coar"— Presentation transcript:

1 Axio Research Idea to Application via SAS Macro Language Reading Directories Bill Coar (

2 Outline The idea Translate the idea to SAS code A couple applications Extension of idea to information about dataset Final remarks

3 The Idea Obtain information about files in a directory Generate a list Apply some command to each element (sequentially) –For example: run each one in batch mode, or search log files

4 The Idea One way to Implement –Generate scripts to be executed from a command prompt –May or may not be so simple Requires additional programming knowledge as well as knowledge of operating environment A different approach –From within SAS

5 The Idea From within SAS using macro language –Open a directory –Read in some information –Close a directory Additionally, –Initiate a list and counter Increment when information read in meets some condition(s)

6 SAS Functions for the Idea Sysfunc –%Sysfunc(function(argument(s)) ); Dopen(fileref) –Opens a directory and returns a directory identifier value Dnum(directory-id) –Returns the number of members in a directory Source: SAS Help and Documentation

7 SAS Functions for the Idea Dread(directory-id,member-num) –Returns the name of a directory member Dclose(directory-id) –Closes a directory that was opened by the DOPEN function Others to gain information about data – Open, Close, Attrn Source: SAS Help and Documentation

8 Open the Directory Specify a directory %let DLOC=D:\client\project\programs; Define a fileref %let filrf=MYDIR; %let rc=%SYSFUNC(filename(filrf,&DLOC)); Open the directory based on the fileref %let DID=%SYSFUNC(dopen(&FILRF)); See how many members there are %let NUMF=%SYSFUNC(dnum(&DID));

9 Read information/increment lists %let FNUM=0; %do F=1 %to &NUMF; %let thisread=%upcase(%sysfunc(dread(&DID,&F))); /* insert some condition for incrementing to a list */ %if %scan(&THISREAD,2)=SAS %then %do; %let fnum=%eval(&FNUM+1); %let dat&FNUM=%scan(&THISREAD,1); %end;

10 Close the directory %LET rc=%SYSFUNC(dclose(&DID));

11 The condition – Including Files Pre-specify some sort of wildcard (*) %macro doit(…,inf=,…); Use the %index function %if %index(&INF,*) gt 0 %then %let INFILE=%SUBSTR(&INF,1,%LENGTH(&INF)-1); %else %let INFILE=&INF; %if %scan(&THISREAD,2)=SAS & %index(&THISREAD,&INFILE) gt 0 %then %do; %let fnum=%eval(&FNUM+1); %let dat&FNUM=%scan(&THISREAD,1); %end;

12 The condition – Excluding Files Specify a list of file names to exclude Use the /minoperator (SAS version 9.2) %macro doit(…,excf=,…) /minoperator; %if %scan(&THISREAD,2)=SAS %then %do; %if %scan(&THISREAD,1) in &EXCF %then %do; * Leave this blank to take advantage of the minoperator.; %end; %else %do; %let fnum=%eval(&FNUM+1); %let dat&FNUM=%scan(&THISREAD,1); %end;

13 Applications SAS batch Searching logs An Application with data –Assessing data values for each variable

14 Running SAS batch Recall the idea: we are doing this from within SAS Execute SAS with appropriate SAS system options Need to identify where the programs reside and where to direct the output –Redirect to an output folder using system options (no proc printto)

15 Running SAS batch – Sample Code OPTIONS NOXWAIT XSYNC; %do a=1 %to &FNUM; * Needed to specify some SAS system options; %let thisfile=%CMPRES(&FILEDIR.\&&DAT&A...SAS); %let atoexec='%CMPRES(&FILEDIR.\AUTOEXEC.SAS)'; * Specify the actual system command; %let scom=%cmpres(C:\PROGRA~1\SAS\SASFOU~2\9.2\sas.exe -nodlgboxes -autoexec &atoexec –nosplash –icon -sysin &&DAT&A ); * Execute the command; data _null_; call system("&scom"); run; %end;

16 Searching Log Files Desire to search the log file(s) –Done through data _null_ –Loop through each file and search each for some text using INDEX UNINITIAL, ERROR:, STOPPED, WARNING, MERGE STATEMENT –Output results to a single text file

17 Searching Log Files – Sample Code data _null_; * Specify the input for this iteration and output file.; infile "&THISFILE" end = eof length = a sharebuffers; file "&LOGFL" %if &A > 1 %then mod;; * Read in each line of text from a log file. input rline $varying200. a; retain linnum errnum; * Added SAS messages and look for errors; if _n_ = 1 then do; linnum=0; errnum=0; put @1 "FILENAME SEARCHED: &THISFILE"; put @1 "TERMS SEARCHED: UNINITIAL, ERROR:, STOPPED, WARNING, MERGE STATEMENT"; end; …more SAS code using INDEX command and put statements Run;

18 Examples Run a single program that generates a figure %runbatch(f_elft); %logsrch(f_elft); Run all the programs that generate data and search the log files %runbatch(a_*); %logsrch(a_*);

19 Extend to Data Rather than working with a directory, work with a dataset, for example: –Determine lists of numeric and character variables –Identify formats (date variables) Obtain summary statistics about each variable

20 Extend to Data Open a dataset and initialize lists %let ds=%sysfunc(open(&SASin,i)); %let columns=%sysfunc(attrn(&DS,NVARS)); %let nc=0; %let nn=0; %let nlist=; %let clist=;

21 Extend to Data Loop through and obtain info about each variable %do i=1 %to &columns; %let col&i=%sysfunc(varname(&ds,&i)); %let ctype&i=%qsysfunc(vartype(&ds,&i)); %if &&ctype&i=C %then %do; %let nc=%eval(&nc+1); %let clist=&clist &&col&i; %end; %else %do; %let nn=%eval(&nn+1); %let nlist=&nlist &&col&i; %end;

22 Extend to Data Close the dataset %let rc=%sysfunc(close(&DS));

23 Application within Data For numeric variables –Mean, min, max, percent missing For character variables –Lengths and percent missing For dates (and times) –Min, max, percent missing

24 Conclusions Idea is fairly straight-forward Plenty of applications for the idea Not restricted to clinical research Certainly are alternatives –Information from Proc Contents –Same functions used within a dataset

25 Any Question? Conclusions

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