Change in Slope Solver – SharkIndicators

The Change in Slope solver tells whether an indicator’s slope is still strengthening, starting to turn, or reversing, by comparing each bar’s slope with the previous bar’s.

Useful for spotting an oscillator or moving average starting to roll over. For example, as the Stochastics rises toward 100, its slope flattens before it turns down.

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.

Global Properties

These settings apply to every instance of the solver: change one instance and they all change. To change just one, make a copy of the solver. The copy is a separate solver, with a number added to the end of its name.

Behavior

Turns off the Long or the Short output.

Setting	What it does
Evaluate	Which outputs the solver calculates. Both: Long and Short. Long only: only Long; the Short output is removed. Short only: only Short; the Long output is removed.

Input

What the solver evaluates. Choose a data type in the Type menu; the settings below it change to match.

Type	What it evaluates
Indicator Value	Any installed indicator with a plot or Series<T> output, chosen in the Select Indicator window. The default and most used type. Displacement reads the value from a number of bars back.
Price	A bar price (Open, High, Low, Close, or the Body Top, Median or Bottom), optionally processed over a lookback period.
Volume	The current bar’s volume.
Swing Point Prices	Prices from the latest swing highs and lows.
Linear Regression Channel	The upper, middle or lower line of a regression channel.
Fixed Value	A single value that never changes. Only useful for solvers with two inputs, such as Comparison.

Every type and its settings in full: Data type selection.

Output

Six situations, each with its own output value. The numbers match the Property Inspector and the diagram.

Setting	Long output when the slope is…	Short output when the slope is…
1) Strong In Direction	rising, and rising faster than on the previous bar	falling, and falling faster
2) In Direction But Turning	rising, but starting to flatten	falling, but starting to flatten
3) In Direction But Greatly Turning	rising, but flattening for a second bar or more	falling, but flattening for a second bar or more
4) Opposite Direction But Greatly Turning	falling, but flattening for a second bar or more (the opposite of 3)	rising, but flattening for a second bar or more
5) Opposite Direction But Turning	falling, but starting to flatten (the opposite of 2)	rising, but starting to flatten
6) Strong In Opposite Direction	falling, and falling faster (the opposite of 1)	rising, and rising faster

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.

Tutorial video

Examples

Example 1: The basics

Measures the strength of the Stochastics D by comparing each bar’s slope with the previous one.

Settings and chart

Settings

Add the Change in Slope solver to the Logic Board and connect it to the Result node.
Set Indicator to Stochastics.

Result

The output is 1 at the turning point and while the slope keeps strengthening, up or down. As the slope weakens, the output drops (In Direction But Turning, then Greatly Turning) until the slope reverses.