[yuxy2@ritchie lab5] testmine
*** testing (x1,y1,x2,y2)=(1.000000,1.000000,2.000000,3.000000),r=5.000000

xval(getvec(x1,y1)) = 1.000000     yval(getvec(x1,y1)) = 1.000000
xval(getvec(x2,y2)) = 2.000000     yval(getvec(x2,y2)) = 3.000000
xval(add( v1,v2 ))  = 3.000000     yval(add( v1,v2 ))  = 4.000000
xval(mul( r ,v1 ))  = 5.000000     yval(mul( r ,v1 ))  = 5.000000
xval(mul( r ,v2 ))  = 10.000000     yval(mul( r, v2 ))  = 15.000000

*** testing (x1,y1,x2,y2)=(10.500000,-7.600000,4.000000,-6.000000),r=2.000000

xval(getvec(x1,y1)) = 10.500000     yval(getvec(x1,y1)) = -7.600000
xval(getvec(x2,y2)) = 4.000000     yval(getvec(x2,y2)) = -6.000000
xval(add( v1,v2 ))  = 14.500000     yval(add( v1,v2 ))  = -13.600000
xval(mul( r ,v1 ))  = 21.000000     yval(mul( r ,v1 ))  = -15.200000
xval(mul( r ,v2 ))  = 8.000000     yval(mul( r, v2 ))  = -12.000000

*** testing (x1,y1,x2,y2)=(10.500000,-6.500000,4.600000,-7.600000),r=-2.000000

xval(getvec(x1,y1)) = 10.500000     yval(getvec(x1,y1)) = -6.500000
xval(getvec(x2,y2)) = 4.600000     yval(getvec(x2,y2)) = -7.600000
xval(add( v1,v2 ))  = 15.100000     yval(add( v1,v2 ))  = -14.100000
xval(mul( r ,v1 ))  = -21.000000     yval(mul( r ,v1 ))  = 13.000000
xval(mul( r ,v2 ))  = -9.200000     yval(mul( r, v2 ))  = 15.200000

*** testing (x1,y1,x2,y2)=(0.000000,0.000000,2.000000,3.000000),r=-2.500000

xval(getvec(x1,y1)) = 0.000000     yval(getvec(x1,y1)) = 0.000000
xval(getvec(x2,y2)) = 2.000000     yval(getvec(x2,y2)) = 3.000000
xval(add( v1,v2 ))  = 2.000000     yval(add( v1,v2 ))  = 3.000000
xval(mul( r ,v1 ))  = 0.000000     yval(mul( r ,v1 ))  = 0.000000
xval(mul( r ,v2 ))  = -5.000000     yval(mul( r, v2 ))  = -7.500000


*** the following is the ordered linklist ***

(-21.000000,13.000000)-->(-9.200000,15.200000)-->(-5.000000,-7.500000)-->
(0.000000,0.000000)-->(1.000000,1.000000)-->(2.000000,3.000000)-->
(3.000000,4.000000)-->(4.000000,-6.000000)-->(4.600000,-7.600000)-->
(5.000000,5.000000)-->(8.000000,-12.000000)-->(10.000000,15.000000)-->
(10.500000,-7.600000)-->(10.500000,-6.500000)-->(14.500000,-13.600000)-->
(15.100000,-14.100000)-->(21.000000,-15.200000)