refactor: reduce assignment duplication

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/gvander/lib/base.js

@@ -122,12 +122,12 @@ function gvander( mode, M, N, x, strideX, offsetX, out, strideOut1, strideOut2,
 	// Column-major...
 	S0 = M;
 	S1 = N;
+	do0 = strideOut1;
+	do1 = strideOut2 - ( S0*strideOut1 );
 
 	// Increasing: column j contains x^j
 	if ( mode > 0 ) {
 		gfill( S0, 1.0, out, strideOut1, offsetOut );
-		do0 = strideOut1;
-		do1 = strideOut2 - ( S0*strideOut1 );
 		io = offsetOut + strideOut2;
 		for ( i1 = 1; i1 < S1; i1++ ) {
 			ix = offsetX;
@@ -142,8 +142,6 @@ function gvander( mode, M, N, x, strideX, offsetX, out, strideOut1, strideOut2,
 	}
 	// Decreasing: column 0 contains x^(N-1), last column all ones
 	gfill( S0, 1.0, out, strideOut1, offsetOut + ( ( S1-1 ) * strideOut2 ) );
-	do0 = strideOut1;
-	do1 = strideOut2 - ( S0*strideOut1 );
 	io = offsetOut + ( ( S1-2 ) * strideOut2 ) + ( ( S0-1 ) * strideOut1 );
 	for ( i1 = S1-2; i1 >= 0; i1-- ) {
 		ix = offsetX + ( ( S0-1 ) * sx );