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update docs and tests

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matei jordache
2026-04-15 23:21:08 -07:00
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docs/nodes/Radial Profile.md
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# Radial Profile
Compute the azimuthally averaged radial profile from a centre point. The output x-axis is radius in physical xy units. Equivalent to gwy_data_field_angular_average used by Gwyddion's Radial Profile tool.
Compute an **azimuthally averaged** profile around a centre point on a DATA_FIELD. At each radius, every pixel in the full 360° ring around the centre is averaged together, so the profile is direction-independent — there is no clockwise/counter-clockwise traversal and no start or end point along the ring. The output is a single 1-D profile: value vs. radius.
## Inputs
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| Name | Type | Default | Description |
|------|------|---------|-------------|
| cx | FLOAT | 0.5 | Centre x position as a fraction of field width (0 = left, 1 = right) |
| cy | FLOAT | 0.5 | Centre y position as a fraction of field height (0 = top, 1 = bottom) |
| n_bins | INT | 128 | Number of radial bins (4-4096) |
## Interactive preview
The dashed circle around the centre shows the outer radius used by the profile. Pixels beyond it are not included in the averaging.
## Notes
- Pixels are assigned to radial bins by Euclidean distance; bins near the centre contain fewer pixels and may be noisier.
- Pixels are assigned to radial bins by Euclidean distance from the centre; inner bins contain fewer pixels and may be noisier.
- Physical x-axis units come from the field's si_unit_xy; uncalibrated fields produce pixel-unit radii.