Hi Folks,
This is probably quite easy, but I can't find a Matrix function or way 
to populate a specific element of a matrix with a given value? ie, I 
want to tell that element i,j of matrix.a should be 3
My code below is a simple test to populate a 5 by 5 matrix from values 
in a CSV text file. The loops etc are messy, but it's just an example.


require "mathn"
i=1
j=1
a = Matrix.zero(5)
File.open("TestData.txt").each do |record|
    record.split(",").each do |field|
    field.chomp!
    if i<5 then
      Matrix.a(i,j)=field                #      <-------------How do I 
do this line?
    end
    if i = 5 then
      i = 1
      j=j+1
    end
    i=i+1
   end
end
puts a.to_s

Any Help/pointers would be great.
TIA.
Jay.