Gate -- node types for straight-line programs

Description

Expressions in an SLP are represented by directed acyclic graphs whose nodes are instances of subclasses of Gate.

SumGate -- a sum of gates
ProductGate -- a product of gates
DivideGate -- a quotient of gates
DetGate -- a determinant gate

These gates are assembled into GateMatrix objects and eventually compiled into straight-line programs.

i1 : declareVariable \ {x,y}

o1 = {x, y}

o1 : List

i2 : f = (x+2*y)^2/(3*x-y)

     ((x + (2 * y)) * (x + (2 * y)))
o2 = -------------------------------
           ((3 * x) + (-1 * y))

o2 : DivideGate

i3 : class f

o3 = DivideGate

o3 : Type

i4 : support f

o4 = {x, y}

o4 : List

i5 : constants f -- shows all constants used in the expression.

o5 = {2, 3, -1}

o5 : List

Types of Gate:

DetGate
DivideGate
InputGate
ProductGate
SumGate

Methods that use an object of class Gate:

- Gate -- see arithmetic with circuits
Gate * Gate -- see arithmetic with circuits
Gate * Matrix -- see arithmetic with circuits
Gate * Number -- see arithmetic with circuits
Gate * RingElement -- see arithmetic with circuits
Gate + Gate -- see arithmetic with circuits
Gate + Number -- see arithmetic with circuits
Gate + RingElement -- see arithmetic with circuits
Gate - Gate -- see arithmetic with circuits
Gate - Number -- see arithmetic with circuits
Gate - RingElement -- see arithmetic with circuits
Gate / Gate -- see arithmetic with circuits
Gate ^ ZZ -- see arithmetic with circuits
Matrix * Gate -- see arithmetic with circuits
Number * Gate -- see arithmetic with circuits
Number + Gate -- see arithmetic with circuits
Number - Gate -- see arithmetic with circuits
RingElement * Gate -- see arithmetic with circuits
RingElement + Gate -- see arithmetic with circuits
RingElement - Gate -- see arithmetic with circuits
compress(Gate) -- see compressing circuits
diff(InputGate,Gate) -- see differentiating circuits
value(Gate,ValueHashTable) -- see evaluating gates
html(Gate) (missing documentation)
countGates(Gate) -- see measuring the size of circuits
net(Gate) (missing documentation)

For the programmer

The object Gate is a type, with ancestor classes HashTable < Thing.

The source of this document is in SLPexpressions/doc.m2:64:0.