taichi equivalent of numpy.sum

[Archana2016]

I have been trying taichi to improve the speed of heavily looped numpy based calculations. I am happy with the speed, but stuck in simple operations.

1. I cannot find a simple way to sum up all elements of the following taichi field
   CON = ti.field(ti.f32, shape=(M,N,O))
   I am looking for something like numpy.sum(CON) without having to loop over M,N,O dimensions

2. Also I would like to know how to multiple all elements of CON with a constant. For example,
   CON = ti.field(ti.f32, shape=(M,N,O))
   x = 0.5
   CON = CON*x # but this throws a taichi scope error

Your suggestions are greatly appreciated

Archana