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3277368
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2010-07-18T21:40:28.347
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2010-07-18T21:40:28.347
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3267683
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There's probably a simpler way but this is what I came up with. Cheers Rob EDIT: Note that this works for both character and numeric variables. <pre><code>** ** TEST DATASET *; data x; col1 = "a"; col2 = ""; col3 = "c"; output; col1 = "" ; col2 = ""; col3 = "c"; output; col1 = "a"; col2 = ""; col3 = "" ; output; run; ** ** GET A LIST OF VARIABLE NAMES *; proc sql noprint; select name into :varlist separated by " " from sashelp.vcolumn where upcase(libname) eq "WORK" and upcase(memname) eq "X"; quit; %put &varlist; ** ** USE A MACRO TO CREATE A DATASTEP. FOR EACH COLUMN THE ** THE DATASTEP WILL CREATE A NEW COLUMN WITH THE SAME NAME ** BUT PREFIXED WITH "DELETE_". IF THERE IS AT LEAST 1 ** NON-MISSING VALUE FOR THE COLUMN THEN THE "DELETE" COLUMN ** WILL FINISH WITH A VALUE OF 0, ELSE 1. WE WILL ONLY ** KEEP THE COLUMNS CALLED "DELETE_" AND OUTPUT ONLY A SINGLE ** OBSERVATION TO THE FINAL DATASET. *; %macro find_unused_cols(iDs=); %local cnt; data vars_to_delete; set &iDs end=eof; %let cnt = 1; %let varname = %scan(&varlist, &cnt); %do %while ("&varname" ne ""); retain delete_&varname; delete_&varname = min(delete_&varname, missing(&varname)); drop &varname; %let cnt = %eval(&cnt + 1); %let varname = %scan(&varlist, &cnt); %end; if eof then do; output; end; run; %mend; %find_unused_cols(iDs=x); ** ** GET A LIST OF VARIABLE NAMES FROM THE NEW DATASET ** THAT WE WANT TO DELETE AND STORE TO A MACRO VAR. *; proc transpose data=vars_to_delete out=vars_to_delete; run; proc sql noprint; select substr(_name_,8) into :vars_to_delete separated by " " from vars_to_delete where col1; quit; %put &vars_to_delete; ** ** CREATE A NEW DATASET CONTAINING JUST THOSE VARS ** THAT WE WANT TO KEEP *; data new_x; set x; drop &vars_to_delete; run; </code></pre>
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1. This table or related slice is empty.
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1. POSelect character variables that have all missing values
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1. PTAnswer
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1. USRobert Penridge
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2. VO
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