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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.

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.

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.