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Name    f1    f2    f3    f4
africa1    18    1    48    23
...
usa1    55    20    56    25
china1    35    37    55    87
china2    40    33    50    73

use strict;
use warnings;
...
}

WITH NEAREST sub
jitendra@jitendra-Aspire-S3-391[test] perl testMAT.pl mat.txt         
+[10:17PM]
...
nearest to 35 in array is: 33  and name is china2
nearest to 59 in array is: 56  and name is usa1
nearest to 70 in array is: 30  and name is africa3