Hi all,
I copied the following code from internet. Can someone please tell me what this LEFT function (see below in bold) do here? I actually don't know the use of left function. Thanks,
/*Duration of exercise each day of week;*/ %LET time1=2.0; %LET time2=1.0; %LET time3=0.5; %LET time4=0.6; %LET time5=0.2; %LET time6=1.0; %LET time7=1.2; /*Exercise planned for each day of week ;*/ %let sport1 =bike; %let sport2 =walk; %let sport3 =jog; %let sport4 =stretch; %let sport5 =bike; %let sport6 =swim; %let sport7 =walk;
DATA eachday wholeweek (KEEP = calsofar timesofar RENAME = (calsofar=calperweek timesofar=hrsperweek)); DO day = 1 TO 7; LENGTH sport intensity $8 ; sport = SYMGET('sport'||LEFT(day)) ; IF sport IN ('bike','swim','jog') THEN intensity = 'hard'; ELSE IF sport IN ('walk','dance') THEN intensity = 'moderate' ; ELSE IF sport IN ('stretch','golf') THEN intensity = 'easy' ; cal_num = INPUT(SYMGET(intensity),4.) ; time = INPUT(SYMGET('time'||LEFT(day)),6.1) ; totalcal = time*cal_num ; calsofar = SUM(calsofar, totalcal) ; timesofar = SUM(timesofar, time) ; RETAIN calsofar timesofar ; OUTPUT eachday ; IF day = 7 THEN OUTPUT wholeweek ; END; RUN;
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