G4, 004, 2026

y = 0.5x2 - 2x + 5

Raised-line graph for x from -0.5 to 4.5

Braille ID G4
top-right corner of the plate

Touch checks TL-1 to TL-5 passed

After 3 attempts. The maths, scope and description guards passed too.

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Description for the learner

This tactile graph shows y = 0.5x^2 - 2x + 5, for x from -0.5 to 4.5.
Hold the plate with the raised triangle at the top-left.
The lowest point (vertex) is at x = 2, y = 3.
The curve crosses the y-axis at y = 5.
Each marked point has a braille letter next to it: a, the vertex; b, the y-intercept.
The braille number in the top-right corner, 4, is this graph's ID.
Note: automated checks measure spacing and size; they do not certify that a learner can understand the graphic.

What the touch check measured

TL-1: passed. Lines at least 3.2 mm apart; closest 3.39 mm.

How it was made

  1. Request #4 named a function, its x range and the points to mark.
  2. A GitLab Duo agent laid out the plate (session).
  3. The pipeline checked it like a fingertip would: passed after 3 attempts; the agent fixed its own layout.
  4. Released as graph-4-v1 and published here.

Print

Scale
100%, flat on the bed, no supports
Hold
Triangle at the top-left; braille ID at the top-right
Profile
fdm-handheld-v1 v1
Built from
commit 4b32f58b, pipeline 2973447276
Files
graph.svg, description.txt, manifest.json

Automated checks measure spacing and size; they do not certify that a learner can understand the graphic.

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