[SAS] problemi di codice

[ivand79]

Qualche genio di SAS sà spiegarmi queste righe di codice:

DATA NEW1;
ARRAY PIP(&IND);
SET TAB12(OBS=&IND) END=FINE;
IF _N_=1 THEN I=1;
ELSE I+1;
PIP(I)=PERCENT;
IF FINE THEN OUTPUT;
RETAIN PIP1-PIP&IND;
/************************************/
DATA NEW2;
ARRAY VX(&IND1) $ 20.;
SET TAB1(OBS=&IND1) END=FINE;
IF _N_=1 THEN I=1;
ELSE I+1;
VX(I)=VARX;
IF FINE THEN OUTPUT;
RETAIN VX1-VX&IND1;
/********************/
DATA NEW3;
ARRAY VY(&IND2) $ 20.;
SET TAB2(OBS=&IND2) END=FINE;
IF _N_=1 THEN I=1;
ELSE I+1;
VY(I)=VARY;
IF FINE THEN OUTPUT;
RETAIN VY1-VY&IND2;
/********************/
DATA VECT;
SET NEW1;
ARRAY PIP{&IND};
ARRAY PIJ{&IND1,&IND2};
K=1;
DO I=1 TO &IND1;
DO J=1 TO &IND2;
PIJ{I,J}=PIP(K)/100;
K=K+1;
END;
END;
RETAIN PIJ1-PIJ&IND;
/**********************/

Grazie anticipatamente per qualsiasi aiuto.