KNN in R

Jayrawrd
xtestQ3-1.csv
V1 V2 V3 V4
1.145120601 2.212591638 1.860415048 0.842381236
2.573741105 1.469336375 1.297223423 1.134293043
1.028673799 2.515845855 0.237631599 2.178445718
1.170138729 1.452262988 1.776003728 -0.276489004
2.334068305 0.422164073 1.131329591 -0.356185829
0.009083285 0.408276242 0.661769542 0.552209688
1.047830538 0.015320516 1.642911233 1.410256476
1.487499406 2.982510546 0.727761913 2.815894452
2.691591939 0.761095821 1.002695549 0.699662092
1.561861337 0.453962931 -0.037269883 1.03431268
1.753335331 0.493042491 0.753444438 1.28374856
-0.069853566 -0.741148559 1.638943629 0.081183451
1.468781619 0.74071494 0.463858494 -1.052336452
1.729505984 1.143130498 1.097040007 2.055113974
-1.710244412 1.839028463 -0.323183462 1.512475173
0.745925087 1.097679262 0.007358625 1.658895221
-0.048033741 1.633966488 1.26907196 0.53909174
-0.196981627 1.461125231 0.355123882 0.587895043
1.619750504 0.791851026 0.950134241 3.05378095
1.586195517 1.073238261 1.969126512 -0.713402394
1.689430893 -0.154829791 0.928918397 0.711088028
1.072623549 -0.193716879 1.694100872 2.047791413
2.99269249 2.048833962 1.015982976 1.653292186
1.895927307 1.034086654 0.308133278 0.196847634
0.398385048 3.490657203 0.828116371 0.329323619
4.114254328 3.260560597 2.42284136 1.854249919
1.483409656 1.87552524 0.894521829 3.090235896
1.067428836 1.612909293 2.598086079 1.903030162
4.978233747 1.99845409 4.098401439 2.188438505
2.482770347 2.472869241 1.914492079 1.153452118
3.882563763 1.530064121 3.962485121 2.505469948
3.570092144 2.470546625 3.238403646 1.881415957
4.299538603 2.344587208 3.056674231 3.655090226
1.689449629 4.061639477 3.161838063 3.546666752
1.863840172 2.882921698 2.210733796 2.667411291
1.654708808 3.340922733 0.840203286 2.520019309
1.789859001 1.758391828 2.370864251 2.576548665
2.958628483 3.051058234 3.567857425 2.655298392
1.034758854 1.001951821 2.865355202 3.35947651
3.078928782 0.78713165 1.933764252 2.853428503
1.354244316 2.057001203 2.494488899 2.064806977
1.887664212 1.43686925 3.054518445 1.554624494
1.90743371 4.644062082 1.063980239 1.00993388
1.521442572 2.629690397 2.16952093 3.676136513
2.264058877 3.938309889 3.579103129 2.440649239
1.602650066 3.003446771 2.029488806 2.254579502
3.645469062 3.56332466 1.864352906 1.087441975
3.835182417 0.560301542 0.65717098 3.011320781
2.618043003 1.621701143 2.757656676 3.35915567
3.585777642 2.078986561 2.467151587 2.822326589