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I just tested your example and is working fine on two different ipads on iPadOS 18.2 Beta 1 and 2.

You are right, graphs are alive since 18.1. I fixed the article. Thank you.

That works in 18.1. Tap the number you want to change in the equation and you get a slider. Change the number and the graph changes.

You are right, graphs are alive in 18.1. I fixed the article. Thank you.

Looks like the graph is rendering a different expression than the one you are modifying. If you tap to select the graph element view there’s a graph config button you can tap to select which expressions are actually active for that view.

Problem was that iPadOS 18.0 did not support alive graphs.