Using PROC FCMP to create a function, which converts from Inches to Centimeters, Centimeters to Inches or missing if values passed are invalid.

Additional Documentation

For more information on PROC FCMP click on the link below to go to a 2007 SAS Global Forum paper about the procedure.

User-Written DATA Step Functions

Click on the link below to go to the SAS 9.2 documentation about PROC FCMP

SAS 9.2 PROC FCMP Documentation

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These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

/*Use an IF condition inside FCMP to control the logic
of returning the value of CONV */

proc fcmp outlib=work.functions.samples;
function sas_measure(amt,val1 $,val2 $);
  if val1='inches' and val2='cm' then do;
     conv=amt*2.54;
  end;
  else if val1='cm' and val2='inches' then do;
     conv=amt*.393700787;
  end;
  else conv=0;
  return(conv);
endsub;
quit;

options cmplib=work.functions;

/*Call the function created in FCMP */

data one;
input x y1 $ y2 $;
new=sas_measure(x,y1,y2);
cards;
10 inches cm
25.4 cm inches
25.4 lb inches
;
run;

proc print;
run;

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These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

Obs      x     y1        y2          new

 1     10.0    inches    cm        25.4000
 2     25.4    cm        inches    10.0000
 3     25.4    lb        inches     0.0000

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