func ExprGen(egp *prob.TreeParams, srules SimpRules, rng *rand.Rand) Expr {
var ret Expr
good := false
cnt := 0
for !good {
egp.ResetCurr()
egp.ResetTemp()
// eqn := ExprGenStats( &egp, rng )
eqn := exprGrow(-1, ExprGenDepth, egp, rng)
eqn.CalcExprStats(0)
// fmt.Printf( "%v\n", eqn)
ret = eqn.Simplify(srules)
ret.CalcExprStats(0)
// fmt.Printf( "%v\n\n", ret)
// check eqn after simp
good = egp.CheckExpr(ret)
cnt++
}
return ret
}
func InjectEqn_50_150(p1 Expr, egp *prob.TreeParams, rng *rand.Rand) Expr {
eqn := p1.Clone()
eqn.CalcExprStats(0)
// begin loop
s1 := rng.Intn(eqn.Size())
s1_tmp := s1
e1 := eqn.GetExpr(&s1_tmp)
egp.ResetCurr()
egp.ResetTemp()
egp.TmpMinSize = e1.Size() / 2
egp.TmpMaxSize = (e1.Size() * 3) / 2
// loop if min/max out of bounds
// and select new subtree
// not correct (should be size based)
new_eqn := exprGrow(-1, ExprGenDepth, egp, rng)
// eqn.SetExpr(&s1, new_eqn )
SwapExpr(eqn, new_eqn, s1)
eqn.CalcExprStats(0)
return eqn
}