The Inverter node inverts its input: it outputs 1 – x, where x is the input value. This is the fuzzy logic NOT.
A favorable 0.8 becomes an unfavorable 0.2, and a signal (1) becomes no signal (0). Use it to build a condition for what you don’t want to see, then invert it. The Long side and the Short side each have their own settings, and each is inverted independently: the Long output comes only from the Long input, the Short output only from the Short input.
Properties tab
The essential settings for the node.
Modifiers
Buttons for the most common output modifiers. They change only the selected instance of a node on a Logic Board, so they appear only when a node is selected there, not when a solver is selected in the Solvers panel. That keeps the solver’s original output unchanged everywhere else it’s used, much like changing an SMA’s plot color on one chart leaves it unchanged on your other charts.
| Button | What it does |
|---|---|
| Enable | Turns the node on or off. When it’s off, the node is left out of the system’s calculations. It still looks connected on the Logic Board, but it’s ignored. |
| Invert | Inverts the node’s output. The same calculation as the Inverter function node, without its extra options. |
| Swap | Swaps the outputs: Long becomes Short and Short becomes Long. The same as the Long/Short Modifier function node with Mode: Swap. |
Properties
This node’s settings apply to this node only. Unlike a solver, which can be used in several places with shared Global Properties, each of these nodes is a single, independent node.
Long Side
| Setting | What it does |
|---|---|
| Enable | On: this side’s value is passed to the output. Off: the node still calculates this side internally, but its output is 0. |
| Invert | On: this side’s input is inverted (1 – x) before it reaches the output. Off: it passes through unchanged. |
Short Side
| Setting | What it does |
|---|---|
| Enable | On: this side’s value is passed to the output. Off: the node still calculates this side internally, but its output is 0. |
| Invert | On: this side’s input is inverted (1 – x) before it reaches the output. Off: it passes through unchanged. |
The Invert button among the Modifiers does the same calculation on any node, without these per-side settings.
Options tab
Secondary settings shared by all nodes.
Weight
Changes the node’s final output value. Only needed when designing a fuzzy logic system, or a fuzzy logic part of a system.
How Weight works
Weight changes only the selected instance of a node on a Logic Board. So the controls appear only when a node is selected there, not when a solver is selected in the Solvers panel: a solver’s original output can’t be changed globally.
| Control | What it does |
|---|---|
| Multiply Output | Multiplies the node’s internal Long and Short values (set by the Output Rules on the Properties tab) by this number. The final output still can’t go above 1 (see Slider). |
| Slider | Limits the final output to between 0 and 1. The left handle sets a minimum output, given whether or not the condition is true. The right handle sets the maximum; the output is capped there. |
| Hedge Operation | Applies a formula to the internal value. None: unchanged. Very: squares it (value²). Somewhat: takes the square root (√value). |
Example: two out of three
Three solvers check three indicator conditions, but only two need to be true. Connect them to an Additive logic node and set each solver’s maximum (the slider’s right handle) to 0.5. When any two are true, the Additive node adds 0.5 + 0.5 + 0 = 1, which means the two-out-of-three condition is met.
Description
Free text for describing what the node does or what it’s for. The Description is shared by every instance of the node, unlike Weight, which is set per instance.
Help tab
Shows this page for the selected node, inside BloodHound. Click the node’s image at the top of the page to open it in a bigger window. The built-in web viewer needs NinjaTrader 8.0.26.0 or newer.