FlowCE 2.3

FlowCE 2.3 adds the normal line and the osculating circle to the graph screen, uses the TI-83
Premium CE's own keys, and opens with a start screen that flows into the app. It also deletes the
installer's leftover files the first time it starts (256 KB of archive back).

Install from the website, or send FlowCE.b84
with TI Connect CE and run INST. On a TI-83 Premium CE, send FlowCE.b83 instead.

• Normal line and osculating circle: on the graph screen, F5 (more) → Normal line here or
  Osculating circle, beside the tangent. They are drawn at the trace point, and the readout gives
  the normal's equation or the circle's, (x−a)²+(y−b)²=R². Functions, parametric and polar curves.
• TI-83 Premium CE: FlowCE reads the model when it starts and uses the 83's keys: trig types
  sin (π on 2nd), résol finds the solve commands, frac makes a fraction. Nothing changes on
  the TI-84 Plus CE.
• The start screen flows into the app: the name rises and fades, and the curve shrinks into the
  trig key's icon, from which the screen fades in. Any key skips it.
• Leftover installer files: INST leaves four AppIns variables (256 KB) in the archive; FlowCE
  deletes them the first time it starts.
• Built with the CE toolchain's nightly compiler: the app is 32 KB smaller.
• Keys after a pause: a quick key press is no longer missed after the calculator has sat idle
  (it read the battery every few seconds, which takes 150 ms; now once a minute).

Checks

• On an emulated TI-84 Plus CE: the 898 regression problems give the same answers as 2.2.4 (none
  hung), and so do the 71 applications problems and the equations, statistics and quartic sets;
  interrupting with on, out of memory (8/8), 101 screen checks, 29 ways through the menus.
• The screens are 2.2.4's but for the version, the new items, and matrices shown large, which sit
  3 pixels higher (centered between the input and the F4 chip).
• The normal line and the osculating circle checked against exact values (y = x²/4, sin x, an
  ellipse). The 83's keys were checked on a build made to act as one (no TI-83 Premium CE was
  available).

Known limits

• One area problem with acos and asin takes over two minutes on the calculator (on stops it).
• Not every problem has steps; when no textbook method explains it, FlowCE says so.

Please report problems with what you typed
and your calculator's OS.

Source: FlowCE 2.3: FlowCE ca1af59 (tag v2.3), giac 054c86b.

Parts of FlowCE (the algebra steps, the graph screen, analyze, statistics and probability) were
adapted from DeltaCE, a GPL-3.0 fork of FlowCE.