Adding seed value, fixes #566 (squashed commit)

Author: shailesh210

lib/nmatrix/shortcuts.rb

@@ -536,7 +536,12 @@ def block_diagonal(*params)
     def random(shape, opts={})
       scale = opts.delete(:scale) || 1.0
 
-      rng = Random.new
+      if opts[:seed].nil?
+        rng = Random.new
+      else
+        rng = Random.new(opts[:seed])
+      end
+      
 
       random_values = []
 

spec/shortcuts_spec.rb

@@ -137,6 +137,17 @@
       expect(m.dtype).to eq(:float64)
     end
 
+    it "creates a matrix of random numbers with defined seed value" do
+      m1 = NMatrix.random(2,:seed => 62)
+      m2 = NMatrix.random(2,:seed => 62)
+      m3 = NMatrix.random(2,:seed => 65)
+
+
+      expect(m1).to eq(m2)
+      expect(m1).not_to eq(m3)
+
+    end
+
     it "creates a complex matrix of random numbers" do
       m = NMatrix.random(2, :dtype => :complex128)
     end