refactor: pointer arithmetic

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---

Author: aayush0325

lib/node_modules/@stdlib/lapack/base/dppequ/lib/base.js

@@ -59,7 +59,7 @@ function dppequ( order, uplo, N, AP, strideAP, offsetAP, S, strideS, offsetS, ou
 	var info;
 	var smin;
 	var amax;
-	var jj;
+	var iap;
 	var is;
 	var i;
 
@@ -75,28 +75,27 @@ function dppequ( order, uplo, N, AP, strideAP, offsetAP, S, strideS, offsetS, ou
 	amax = S[ is ];
 
 	is = offsetS + strideS;
+	iap = offsetAP;
 	if ( uplo === 'U' ) {
-		jj = 0;
 		for ( i = 1; i < N; i++ ) {
 			if ( order === 'row-major' ) {
-				jj += N - i + 1;
+				iap += ( N - i + 1 ) * strideAP;
 			} else { // order === 'column-major'
-				jj += i + 1;
+				iap += ( i + 1 ) * strideAP;
 			}
-			S[ is ] = AP[ offsetAP + (jj * strideAP) ];
+			S[ is ] = AP[ iap ];
 			smin = min( smin, S[ is ] );
 			amax = max( amax, S[ is ] );
 			is += strideS;
 		}
 	} else { // uplo === 'L'
-		jj = 0;
 		for ( i = 1; i < N; i++ ) {
 			if ( order === 'row-major' ) {
-				jj += i + 1;
+				iap += ( i + 1 ) * strideAP;
 			} else { // order === 'column-major'
-				jj += N - i + 1;
+				iap += ( N - i + 1 ) * strideAP;
 			}
-			S[ is ] = AP[ offsetAP + (jj * strideAP) ];
+			S[ is ] = AP[ iap ];
 			smin = min( smin, S[ is ] );
 			amax = max( amax, S[ is ] );
 			is += strideS;