# HG changeset patch
# User Nicolas Saunier <nicolas.saunier@polymtl.ca>
# Date 1304017641 14400
# Node ID f234154207d4ee1048e5118ae9b18b83785cdee7
# Parent  f03ec4697a098454b2d806ab4fd94e2c0b97c5b5
distance and time to change speed

diff -r f03ec4697a09 -r f234154207d4 python/traffic_engineering.py
--- a/python/traffic_engineering.py	Tue Apr 19 02:01:09 2011 -0400
+++ b/python/traffic_engineering.py	Thu Apr 28 15:07:21 2011 -0400
@@ -171,3 +171,13 @@
 def uniformDelay(cycleLength, effectiveGreen, saturationDegree):
     '''Computes the uniform delay'''
     return 0.5*cycleLength*(1-float(effectiveGreen)/cycleLength)/(1-float(effectiveGreen*saturationDegree)/cycleLength)
+
+#########################
+# misc
+#########################
+
+def timeChangingSpeed(v0, vf, a, TPR):
+    return TPR+(vf-v0)/a
+
+def distanceChangingSpeed(v0, vf, a, TPR):
+    return TPR*v0+(vf*vf-v0*v0)/(2*a)