Intraday Momentum Index (IMI)

Summary

Intraday Momentum Index: an RSI-like 0-100 oscillator built from the open-to-close body of each bar. Over a rolling window it ratios cumulative up-body moves against total up+down body moves.

Chart

Reference data (CSV) · Chart (SVG)

Chart metadata i

Outputs

• outReal: line · zero · positive · levels: 30, 70

Formula

upsum = Σ(close-open) for bars with close>open; downsum = Σ(open-close) for bars with close<=open, over window [i-lookback, i]; IMI = 100 * upsum/(upsum+downsum)

Inputs

• inOpen — Open price of each bar
• inClose — Close price of each bar

Outputs

• outReal — IMI oscillator value, 0-100

Parameters

Parameter	Type	Default	Accepted values	Description
optInTimePeriod	integer	14	2–100000	Rolling window length for the up/down body sums

Properties

Numerical Stability: Start-Independent

☐ Overlap Input
✅ Independent Y-Axis i
☐ Candlestick
☐ Display Shift

☐ Can Output NaN or ±Inf
☐ Identity at Period 1
☐ Uses Transcendental
☐ Input Must Be Positive

Example

C

#include <stdio.h>
#include <ta_libc.h>

int n = 252;
double open[252]; /* your data, oldest first */
double close[252]; /* your data, oldest first */
double out[252];
int outBegIdx, outNBElement;

TA_Initialize();
TA_IMI( 0, n - 1, open, close, 14, &outBegIdx, &outNBElement, out );
printf( "%d values from bar %d; last out = %f\n", outNBElement, outBegIdx, out[outNBElement - 1] );

Rust

use ta_lib::Core;

let open = vec![0.0; 252]; // your data, oldest first
let close = vec![0.0; 252]; // your data, oldest first
let mut out = vec![0.0; 252];

let core = Core::new();
let range = core.imi(0, open.len() - 1, &open, &close, 14, &mut out)?;
println!("{} values from bar {}; last out = {}", range.count, range.beg_idx, out[range.count - 1]);

Java

import io.github.talib.Core;
import io.github.talib.OutRange;

double[] open = new double[252]; // your data, oldest first
double[] close = new double[252]; // your data, oldest first
double[] out = new double[252];

Core core = Core.DEFAULT;
OutRange r = core.imi(0, open.length - 1, open, close, 14, out);
System.out.println(r.count() + " values from bar " + r.begIdx() + "; last out = " + out[r.count() - 1]);

C#

using System;
using TALib;

var open = new double[252]; // your data, oldest first
var close = new double[252]; // your data, oldest first
var outReal = new double[252];

var core = Core.Default;
OutRange r = core.Imi(0, open.Length - 1, open, close, 14, outReal);
Console.WriteLine($"{r.Count} values from bar {r.BegIdx}; last outReal = {outReal[r.Count - 1]}");

TypeScript

import { imi } from 'ta-lib';

const open = new Float64Array(252); // your data, oldest first
const close = new Float64Array(252); // your data, oldest first

const { begIdx, values } = imi({ open, close }, { timePeriod: 14 });
console.log(values.length + ' values from bar ' + begIdx + '; last values = ' + values[values.length - 1]);

Implementation

Added in 0.6.0.

TA-Lib Definition: imi.c · imi.yaml

Native	File
C	ta_IMI.c
Rust	imi.rs
Java	Core_IMI.java
C#	Core_IMI.cs
TypeScript	imi.ts

Python: talib.IMI, see ta-lib-python.

TA-Lib is also available for R and more using a wrapper.

Aliases

Intraday Momentum Index

See Also

RSI