NMatrix.load_matlab_file raises exception

[alyssais]

From the root of the repository:

ruby -Ilib -r nmatrix -e "NMatrix.load_matlab_file(ARGV[0])" /path/to/file.mat

/Users/alyssa/.gem/ruby/2.4.0/gems/backports-3.6.8/lib/backports/1.8.7/fixnum/div.rb:1: warning: constant ::Fixnum is deprecated
/Users/alyssa/.gem/ruby/2.4.0/gems/backports-3.6.8/lib/backports/1.8.7/fixnum/fdiv.rb:1: warning: constant ::Fixnum is deprecated
/Users/alyssa/.gem/ruby/2.4.0/gems/backports-3.6.8/lib/backports/2.1.0/bignum/bit_length.rb:1: warning: constant ::Bignum is deprecated
/Users/alyssa/.gem/ruby/2.4.0/gems/backports-3.6.8/lib/backports/2.1.0/fixnum/bit_length.rb:1: warning: constant ::Fixnum is deprecated
/private/tmp/nmatrix/lib/nmatrix/monkeys.rb:121:in `gsub': stack level too deep (SystemStackError)
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:121:in `underscore'
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:132:in `const_missing'
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:134:in `const_get'
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:134:in `const_missing'
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:134:in `const_get'
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:134:in `const_missing'
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:134:in `const_get'
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:134:in `const_missing'
	 ... 9776 levels...
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:134:in `const_get'
	from /private/tmp/nmatrix/lib/nmatrix/monkeys.rb:134:in `const_missing'
	from /private/tmp/nmatrix/lib/nmatrix/nmatrix.rb:100:in `load_matlab_file'
	from -e:1:in `'

This error occurs because that method looks up Mat5Reader in the wrong namespace.

This patch fixes it:

From 476a898c40b15a8889ea5b6d8ce395eab3cc00ba Mon Sep 17 00:00:00 2001
From: Alyssa Ross <hi@alyssa.is>
Date: Wed, 22 Mar 2017 10:58:01 +0000
Subject: [PATCH] Fix incorrect reference in .load_matlab_file

---
 lib/nmatrix/nmatrix.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/nmatrix/nmatrix.rb b/lib/nmatrix/nmatrix.rb
index 6898cc1..06d731b 100644
--- a/lib/nmatrix/nmatrix.rb
+++ b/lib/nmatrix/nmatrix.rb
@@ -97,7 +97,7 @@ class NMatrix
     # * *Returns* :
     #   - A Mat5Reader object.
     def load_matlab_file(file_path)
-      NMatrix::IO::Mat5Reader.new(File.open(file_path, 'rb')).to_ruby
+      NMatrix::IO::Matlab::Mat5Reader.new(File.open(file_path, 'rb')).to_ruby
     end
 
     # call-seq:

As a workaround in the meantime, one can use NMatrix::IO::Matlab.load_mat instead.

Even though I have a fix, I'm submitting this as an issue instead of a PR because as far as I can see there's currently no infrastructure to test Matlab files, and I don't have the time to set one up for this trivial fix, so I can't provide a spec.

[translunar]

Hi @alyssais, would you mind submitting as a PR anyway, please? I'll open an issue for creating a spec for Matlab IO.