use Math::MatrixReal;

#update:
Math::MatrixReal->new_from_string(<<'MATRIX');
[ 0 48.23 17.90]
[ 48.23 0 49.58]
[ 17.90 49.58 0]
[ 59.62 52.04 65.80]
[ 62.20 56.02 68.82]
[ 35.37 37.87 36.52]
[ 27.33 50.73 31.85]
MATRIX