func funcDelta(vals []Value, args Expressions, enh *EvalNodeHelper) Vector {
	return extrapolatedRate(vals, args, enh, false, false)
}
func funcDelta(vals []Value, args Expressions, enh *EvalNodeHelper) Vector {
	return extrapolatedRate(vals, args, enh, false, false)
}
func funcDelta ( vals [ ] Value , args Expressions , enh * EvalNodeHelper ) Vector { return extrapolatedRate ( vals , args , enh , false , false ) }
// === delta(Matrix ValueTypeMatrix) Vector ===
=== delta ( Matrix ValueTypeMatrix ) Vector ===