1 from Timba.TDL import *
   2 from Timba.Meq import meq
   3 
   4 Settings.forest_state.cache_policy = 100;
   5 
   6 def _define_forest (ns):
   7 
   8   # create a constant node with value 5
   9   ns.const << Meq.Constant(5)
  10 
  11   # Now we sum the value of the constant over the number of cells
  12   # in our domain. Since we have 8 cells (4 x 2) the 'sumup' node
  13   # has value 40. i.e. we have essentially 'assigned' a value of 5
  14   # to every cell
  15   ns.sumup << Meq.Sum(ns.const)
  16 
  17   # The mean value of a group of cells, all of which have the value 5
  18   # will be 5!
  19   ns.mean << Meq.Mean(ns.const)
  20 
  21   # the standard deviation will be zero!
  22   ns.stddev << Meq.StdDev(ns.const)
  23 
  24   # the Meq.ReqSeq (Request Sequencer) node enables us
  25   # to perform a number of separate requests in sequence.
  26   # If this node had a parent, it would return the contents
  27   # of the ns.multiply node, as we give the result_index
  28   # a value of 2 (zero-based) so we return the contents of the
  29   # third node.
  30   ns.reqseq << Meq.ReqSeq(ns.sumup, ns.mean, ns.stddev, result_index=2)
  31 
  32 def _test_forest (mqs,parent):
  33 
  34   # we create a time-frequency 'domain' with range 0 to 2 in
  35   # frequency and  0 to 1 in time. Then we split
  36   # the domain into a 4 x 2 "cells' array in frequency and
  37   # time. The frequency range will be split into 4 increments,
  38   # while the time range will be split into 2 increments.
  39 
  40   cells = meq.cells(meq.domain(0,2,0,1),num_freq=4,num_time=2);
  41 
  42   # execute request
  43   request = meq.request(cells,rqtype='e1')
  44   a = mqs.meq('Node.Execute',record(name='reqseq',request=request),wait=True);
  45 
  46 # The following is the testing branch, executed when the script is run directly
  47 # via 'python script.py'
  48 
  49 if __name__ == '__main__':
  50 #  from Timba.Meq import meqds
  51   Timba.TDL._dbg.set_verbose(5);
  52   ns = NodeScope();
  53   _define_forest(ns);
  54   # resolves nodes
  55   ns.Resolve();