Vectorize Replicate

Submitted by Gael Guennebaud @ggael

Assigned to Nobody

Link to original bugzilla bug (#456)
Version: 3.1

Description

The Replicate expression is not vectorized yet! As a result, in some cases it is faster to multiply by a vector or matrix of ones: http://forum.kde.org/viewtopic.php?f=74&t=101911&p=221305#p221305

Blocking

#558 (closed)