Stig Eide wrote: > Gerhard Hellriegel wrote: > > example: > > > > %macro double(x); > > %let res=%eval(&x*2); > > &res; > > %mend; > > > > %let test=%double(8); > > > > > > But be careful with the usage: > > > > data a; > > set sashelp.class; > > *double_age=%double(age); /* this will not work */ > > quad_age=age*%double(2); > > put quad_age; > > run; > > > > Regards, > > Gerhard > > > You must be aware that the macro will resolve before the program is > run, so the value of age is not known at the time the macro is > resolved. > If you want to resolve a macro during execution, you need to use the > resolve function: > double_age=resolve('%double('!!put(age,2.)!!')'''); > Documentation: > http://support.sas.com/onlinedoc/913/getDoc/no/mcrolref.hlp/a000210258.htm > Stig

You can have a macro that just resolves into sas code and then it will work fine inside a data step. Here is my %age macro to illustrate.

http://www.datasavantconsulting.com/roland/spectre/macros/age.sas