Verlet integration in ruby (#482)

* vervlet integration in ruby

* file name fix

Author: tarunvelli

contents/verlet_integration/code/ruby/verlet.rb

@@ -0,0 +1,50 @@
+def verlet(pos, acc, dt)
+
+    prev_pos = pos
+    time = 0
+    while pos > 0 do
+        time += dt
+        temp_pos = pos
+        pos = pos*2 - prev_pos + acc * dt * dt
+        prev_pos = temp_pos
+    end
+
+   return time
+
+end
+
+def stormer_verlet(pos, acc, dt)
+
+    prev_pos = pos
+    vel = 0
+    time = 0
+    while pos > 0 do
+        time += dt
+        temp_pos = pos
+        pos = pos*2 - prev_pos + acc * dt * dt
+        prev_pos = temp_pos
+
+        vel += acc*dt
+    end
+
+   return time
+
+end
+
+def velocity_verlet(pos, acc, dt)
+
+    vel = 0
+    time = 0
+    while pos > 0 do
+        time += dt
+        pos += vel*dt + 0.5*acc * dt * dt
+        vel += acc*dt
+    end
+
+   return time
+
+end
+
+p verlet(5.0, -10, 0.01)
+p stormer_verlet(5.0, -10, 0.01)
+p velocity_verlet(5.0, -10, 0.01)

contents/verlet_integration/verlet_integration.md

@@ -59,6 +59,8 @@ Unfortunately, this has not yet been implemented in LabVIEW, so here's Julia cod
 [import:1-15, lang:"swift"](code/swift/verlet.swift)
 {% sample lang="f90" %}
 [import:1-20, lang:"fortran"](code/fortran/verlet.f90)
+{% sample lang="ruby" %}
+[import:1-14, lang="ruby"](code/ruby/verlet.rb)
 {% sample lang="go" %}
 [import:5-16, lang:"go"](code/golang/verlet.go)
 {% endmethod %}
@@ -107,6 +109,8 @@ Unfortunately, this has not yet been implemented in LabVIEW, so here's Julia cod
 [import:17-34, lang:"swift"](code/swift/verlet.swift)
 {% sample lang="f90" %}
 [import:22-42, lang:"fortran"](code/fortran/verlet.f90)
+{% sample lang="ruby" %}
+[import:16-32, lang="ruby"](code/ruby/verlet.rb)
 {% sample lang="go" %}
 [import:18-30, lang:"go"](code/golang/verlet.go)
 {% endmethod %}
@@ -169,6 +173,8 @@ Unfortunately, this has not yet been implemented in LabVIEW, so here's Julia cod
 [import:36-49, lang:"swift"](code/swift/verlet.swift)
 {% sample lang="f90" %}
 [import:44-60, lang:"fortran"](code/fortran/verlet.f90)
+{% sample lang="ruby" %}
+[import:34-46, lang="ruby"](code/ruby/verlet.rb)
 {% sample lang="go" %}
 [import:32-42, lang:"go"](code/golang/verlet.go)
 {% endmethod %}
@@ -213,6 +219,8 @@ Submitted by P. Mekhail
 [import, lang:"swift"](code/swift/verlet.swift)
 {% sample lang="f90" %}
 [import, lang:"fortran"](code/fortran/verlet.f90)
+{% sample lang="ruby" %}
+[import, lang="ruby"](code/ruby/verlet.rb)
 {% sample lang="go" %}
 [import, lang:"go"](code/golang/verlet.go)
 {% endmethod %}