/usr/share/doc/ruby-gsl/examples/vector/ is in ruby-gsl 2.1.0.3+dfsg1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/ruby-gsl/examples/vector/a.dat
/usr/share/doc/ruby-gsl/examples/vector/add.rb
/usr/share/doc/ruby-gsl/examples/vector/b.dat
/usr/share/doc/ruby-gsl/examples/vector/c.dat
/usr/share/doc/ruby-gsl/examples/vector/collect.rb
/usr/share/doc/ruby-gsl/examples/vector/compare.rb
/usr/share/doc/ruby-gsl/examples/vector/complex.rb
/usr/share/doc/ruby-gsl/examples/vector/complex_get_all.rb
/usr/share/doc/ruby-gsl/examples/vector/complex_set_all.rb
/usr/share/doc/ruby-gsl/examples/vector/complex_view_all.rb
/usr/share/doc/ruby-gsl/examples/vector/connect.rb
/usr/share/doc/ruby-gsl/examples/vector/decimate.rb
/usr/share/doc/ruby-gsl/examples/vector/diff.rb
/usr/share/doc/ruby-gsl/examples/vector/filescan.rb
/usr/share/doc/ruby-gsl/examples/vector/floor.rb
/usr/share/doc/ruby-gsl/examples/vector/get_all.rb
/usr/share/doc/ruby-gsl/examples/vector/gnuplot.rb
/usr/share/doc/ruby-gsl/examples/vector/graph.rb
/usr/share/doc/ruby-gsl/examples/vector/histogram.rb
/usr/share/doc/ruby-gsl/examples/vector/linspace.rb
/usr/share/doc/ruby-gsl/examples/vector/log.rb
/usr/share/doc/ruby-gsl/examples/vector/logic.rb
/usr/share/doc/ruby-gsl/examples/vector/logspace.rb
/usr/share/doc/ruby-gsl/examples/vector/minmax.rb
/usr/share/doc/ruby-gsl/examples/vector/mul.rb
/usr/share/doc/ruby-gsl/examples/vector/narray.rb
/usr/share/doc/ruby-gsl/examples/vector/read.rb
/usr/share/doc/ruby-gsl/examples/vector/set.rb
/usr/share/doc/ruby-gsl/examples/vector/set_all.rb
/usr/share/doc/ruby-gsl/examples/vector/smpv.dat
/usr/share/doc/ruby-gsl/examples/vector/test.rb
/usr/share/doc/ruby-gsl/examples/vector/test_gslblock.rb
/usr/share/doc/ruby-gsl/examples/vector/vector.rb
/usr/share/doc/ruby-gsl/examples/vector/view.rb
/usr/share/doc/ruby-gsl/examples/vector/view_all.rb
/usr/share/doc/ruby-gsl/examples/vector/where.rb
/usr/share/doc/ruby-gsl/examples/vector/write.rb
/usr/share/doc/ruby-gsl/examples/vector/zip.rb