Find First Index (FINDFIRSTINDEX)

QuantNexus indicator page for first-match index logic.

Route: /quantnexus/indicators/findfirstindex/

What It Does

FINDFIRSTINDEX returns the first index in a lookback window that satisfies a chosen condition. It is a utility for event detection.

Formula

Return the earliest bar index that matches the selected condition within the lookback period.

Parameters

• period - default 14
• _evalfunc - default close_gt_open

C++23 API

#include <nonabt/indicators/findfirstindex.hpp>
auto firstIndex = std::make_unique<nonabt::FINDFIRSTINDEX>(data(), 14, "close_gt_open");

Common Usage

• Use it to detect the first qualifying event in a window.
• Combine with pattern recognition logic.
• Useful in rule engines and signal timing helpers.

Practical Pattern

FINDFIRSTINDEX is helpful when the first occurrence of an event matters more than the latest one.