--- orig/dlatrs.f	2022-11-11 17:49:54
+++ dlatrs.f	2022-12-16 14:50:10
@@ -259,7 +259,7 @@
       LOGICAL            NOTRAN, NOUNIT, UPPER
       INTEGER            I, IMAX, J, JFIRST, JINC, JLAST
       DOUBLE PRECISION   BIGNUM, GROW, REC, SMLNUM, SUMJ, TJJ, TJJS,
-     $                   TMAX, TSCAL, USCAL, XBND, XJ, XMAX
+     $                   TMAX, TSCAL, USCAL, XBND, XJ, XMAX, WK(1)
 *     ..
 *     .. External Functions ..
       LOGICAL            LSAME
@@ -361,17 +361,19 @@
 *
 *              A is upper triangular.
 *
+*     R change: SUMJ -> WK to avoid rank mismatch.
                DO J = 2, N
-                  TMAX = MAX( DLANGE( 'M', J-1, 1, A( 1, J ), 1, SUMJ ),
+                  TMAX = MAX( DLANGE( 'M', J-1, 1, A( 1, J ), 1, WK ),
      $                        TMAX )
                END DO
             ELSE
 *
 *              A is lower triangular.
 *
+*     R change: SUMJ -> WK to avoid rank mismatch.
                DO J = 1, N - 1
                   TMAX = MAX( DLANGE( 'M', N-J, 1, A( J+1, J ), 1,
-     $                        SUMJ ), TMAX )
+     $                        WK ), TMAX )
                END DO
             END IF
 *