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Add SFG for scheduling example in lab

Merged Oscar Gustafsson requested to merge labsfg into master
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"""
 
Example SFG used for scheduling in the TSTE87 course.
 
 
Node numbering from the original SFG used with the Matlab toolbox.::
 
 
sfg=addoperand([],'in',1,1);
 
sfg=addoperand(sfg,'constmult',1,1,2,0.25);
 
sfg=addoperand(sfg,'constmult',2,4,5,0.75);
 
sfg=addoperand(sfg,'add',1,[2 1],6);
 
sfg=addoperand(sfg,'add',2,[2 5],3);
 
sfg=addoperand(sfg,'add',3,[6 4],7);
 
sfg=addoperand(sfg,'delay',1,3,4);
 
sfg=addoperand(sfg,'out',1,7);
 
"""
 
from b_asic.signal_flow_graph import SFG
 
from b_asic.special_operations import Delay, Input, Output
 
 
node1 = Input()
 
node2 = node1 * 0.25
 
node6 = node2 + node1
 
node4 = Delay()
 
node7 = node6 + node4
 
out = Output(node7)
 
node5 = 0.75 * node4
 
node3 = node2 + node5
 
node4 << node3
 
 
sfg = SFG([node1], [out], name="Scheduling example")
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