undefined method `build' for Matrix:Class

Question

I have extended the Matrix class in my rails app to add two new methods as described here:

The above methods now work fine. Also some of the existing methods work fine such as

Matrix.column_vector([4,5,6])
Matrix.columns([[25, 93], [-1, 66]])

but

Matrix.build(2, 4) {|row, col| col - row }
Matrix.build(3) { rand }

do not work and give the error

undefined method `build' for Matrix:Class

The methods are all defined in this page here:

What could be causing the build method to not work, when other Matrix methods do work? Am I missing an extra library or class?

EDIT 1: I realised it is because I have ruby 1.8.7 when the build method is defined in 1.9.3

So write an answer, and accept that later to close your question. The solution is obvious: Switch to Ruby 1.9.3 (or copy the new code into your library, and remember later to remove it again). — mliebelt, Feb 11 '12 at 12:06
A user with less than 100 reptuation can't post an answer to their own question for 8 hours (I've already tried) — Zakoff, Feb 11 '12 at 12:47

score 0 · Answer 1 · answered Feb 11 '12 at 17:48

0

I realised it is because I have ruby 1.8.7 when the build method is defined in 1.9.3

answered Feb 11 '12 at 17:48

Zakoff

1 Answers1