Matrix.rb没有这样的文件Ruby 1.9.2

| 我已经安装了Ruby 1.9.2:
alykhan@helium:~$ ruby -v
ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-linux]
但是在irb中,当我尝试
require \'Matrix\'
时,出现如下错误:
alykhan@helium:~$ irb
irb(main):001:0> require \'Matrix\'
LoadError: no such file to load -- Matrix
    from <internal:lib/rubygems/custom_require>:29:in `require\'
    from <internal:lib/rubygems/custom_require>:29:in `require\'
    from (irb):1
    from /usr/local/ruby/bin/irb:12:in `<main>\'
irb(main):002:0>
我是否需要安装特定的gem才能获取Matrix lib?     
已邀请:
使用小写字母:
require \'matrix\'
    

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