IROC Stock Viewer

A local Streamlit app for graphing a stock price curve, its ROC / slope, and IROC.

In this project:

• f(x) is the stock price graph.
• ROC / slope is the first numerical derivative.
• IROC is the second numerical derivative.

The app uses Yahoo Finance data through yfinance.

Setup

python -m venv .venv
.\.venv\Scripts\Activate.ps1
python -m pip install --upgrade pip
python -m pip install -r requirements.txt

Run

streamlit run app.py

Then open the local URL printed by Streamlit, usually:

http://localhost:8501

Ticker examples

• AAPL
• MSFT
• BMO.TO
• RY.TO

Canadian tickers generally need the .TO suffix for Yahoo Finance.

Features

• Price graph using adjusted close data.
• Daily and intraday intervals, including 1 minute, 5 minute, 15 minute, 30 minute, 1 hour, and 1 day bars.
• Optional candlestick chart when OHLC data is available.
• ROC / slope graph for the first derivative.
• IROC graph for the second derivative.
• IROC shown in dollar or percent units for the selected time scale.
• Optional derivative axis scaler, such as x1,000, for easier reading of very small ROC/IROC values.
• Moving-average smoothing before derivatives.
• Optional smooth visual curve interpolation.
• Optional compressed intraday x-axis that removes non-trading gaps.
• Optional zero-crossing markers.
• Optional local peak/trough markers.
• Normalized comparison chart for other tickers.
• CSV export for calculated data.
• HTML and PNG chart exports.

Manual math check

For prices:

[100, 105, 103]

The dollar ROC is:

[NaN, 5, -2]

The dollar IROC is:

[NaN, NaN, -7]

Intraday and continuous curves

Yahoo Finance data is still sampled market data. A 1-minute interval gives one bar per minute, not a truly continuous function.

The app treats the selected interval as the derivative step:

• 1m interval: ROC is dollars/minute and IROC is dollars/minute^2.
• 5m interval: price change is divided by 5 to estimate dollars/minute.
• 1h interval: ROC is dollars/hour and IROC is dollars/hour^2.
• 1d interval: ROC is dollars/trading day and IROC is dollars/trading day^2.

The smooth visual curve option makes the graph look continuous with interpolation, but the math is still calculated from the real sampled bars.

The derivative axis scaler is display-only. For example, with x1,000 enabled, a raw IROC value of 0.00183997 is displayed on the chart as 1.83997. CSV exports still use the raw calculated values.