matrix - Replace value of a Vector in Ruby -

i have matrix , want replace values of column (or row) single value.

i tried this:

m = matrix.empty(5, 0) n = matrix.empty(0, 5) g = m *n  puts g.column(3).map! { 3 } 

but map! isn't working vector, , map doesn't change values of column in matrix. how can this?

g.column(3).class => vector vector.instance_methods.grep(/map/) => [:map, :map2, :flat_map] 

vector haven't map! method.

 g[0, 0] =3  nomethoderror: private method `[]=' called #<matrix:0x007f8cd8951d18>   

[]= private method, can use send method bypass private:

 g.send(:[]=, 0, 0, 3)  => 3   g = matrix[[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]  5.times |i|     g.send(:[]=,i, 3, 3) end  g => matrix[[0, 0, 0, 3, 0], [0, 0, 0, 3, 0], [0, 0, 0, 3, 0], [0, 0, 0, 3, 0], [0, 0, 0, 3, 0]]  irb(main):580:0> 5.times |i| irb(main):581:1* g.send(:[]=, 0, i, 3) irb(main):582:1> end => 5 irb(main):583:0> g => matrix[[3, 3, 3, 3, 3], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]