Hands-On SAS for Data Analysis

Macros that evaluate

We know that macro variables are stored as character values. The %eval function helps evaluate integers or logical expressions. The function converts the character data to a numeric or logical expression. After performing the evaluation, it then converts the result back to a character value and returns the value.

We will now try and evaluate some macro variables:

OPTIONS SYMBOLGEN;%Let A1 = (1+0);%Let A2 = (1+5);%Let A3 = (10-5);%Let A4 = (10/5);%Let A5 = (10/3);%Let A6 = (1-0.1);%Let eval_A1 = %eval(&A1);%Let eval_A2 = %eval(&A2);%Let eval_A3 = %eval(&A3);%Let eval_A4 = %eval(&A4);%Let eval_A5 = %eval(&A5);%Let eval_A6 = %eval(&A6);%PUT eval_A1 = &eval_A1;%PUT eval_A2 = &eval_A2;%PUT eval_A3 = &eval_A3;%PUT eval_A4 = ...