r (radius) scale

Author: mbostock

docs/features/scales.md

@@ -559,7 +559,7 @@ A scale’s **type** is most often inferred from associated marks’ channel val
 
 If a scale’s **domain** is specified explicitly, the scale’s **type** is inferred from the **domain** values rather than channels as described above. However, if the **domain** or **range** has more than two elements, the *ordinal* type (or *point* for position scales) is used.
 
-Finally, some marks declare the scale **type** for associated channels. For example, [barX](../marks/bar.md) requires *y* to be a *band* scale. Further, the facet scales *fx* and *fy* are always *band* scales, and the radius scale *r* is implicitly a *sqrt* scale.
+Finally, some marks declare the scale **type** for associated channels. For example, [barX](../marks/bar.md) requires *y* to be a *band* scale. Further, the facet scales *fx* and *fy* are always *band* scales, and the *r* (radius) scale is implicitly a *sqrt* scale.
 
 If you don’t specify a quantitative scale’s **domain**, it is the extent (minimum and maximum) of associated channel values, except for the *r* (radius) scale where it goes from zero to the maximum. A quantitative domain can be extended to “nice” human-readable values with the **nice** option. For an ordinal scale, the domain defaults to the sorted union (all distinct values in natural order) of associated values; see the [**sort** mark option](#sort-mark-option) to change the order.
 
@@ -664,7 +664,7 @@ Plot.plot({x: {domain: [new Date("1880-01-01"), new Date("2016-11-01")]}})
 
 Plot supports many scale types. Some scale types are for quantitative data: values that can be added or subtracted, such as temperature or time. Other scale types are for ordinal or categorical data: unquantifiable values that can only be ordered, such as t-shirt sizes, or values with no inherent order that can only be tested for equality, such as types of fruit. Some scale types are further intended for specific visual encodings: for example, as position or color.
 
-You can set the scale type explicitly via the **type** scale option, though typically the scale type is inferred automatically. Some marks mandate a particular scale type: for example, [barY](../marks/bar.md) requires that the *x* scale is a *band* scale. Some scales have a default type: for example, the *radius* scale defaults to *sqrt* and the *opacity* scale defaults to *linear*. Most often, the scale type is inferred from associated data, pulled either from the domain (if specified) or from associated channels. Strings and booleans imply an ordinal scale; dates imply a UTC scale; and anything else is linear. Unless they represent text, we recommend explicitly converting strings to more specific types when loading data (*e.g.*, with d3.autoType or Observable’s FileAttachment). For simplicity’s sake, Plot assumes that data is consistently typed; type inference is based solely on the first non-null, non-undefined value.
+You can set the scale type explicitly via the **type** scale option, though typically the scale type is inferred automatically. Some marks mandate a particular scale type: for example, [barY](../marks/bar.md) requires that the *x* scale is a *band* scale. Some scales have a default type: for example, the *r* (radius) scale defaults to *sqrt* and the *opacity* scale defaults to *linear*. Most often, the scale type is inferred from associated data, pulled either from the domain (if specified) or from associated channels. Strings and booleans imply an ordinal scale; dates imply a UTC scale; and anything else is linear. Unless they represent text, we recommend explicitly converting strings to more specific types when loading data (*e.g.*, with d3.autoType or Observable’s FileAttachment). For simplicity’s sake, Plot assumes that data is consistently typed; type inference is based solely on the first non-null, non-undefined value.
 
 For quantitative data (*i.e.* numbers), a mathematical transform may be applied to the data by changing the scale type:
 

docs/marks/dot.md

@@ -316,7 +316,7 @@ In addition to the [standard mark options](../features/marks.md#mark-options), t
 
 * **x** - the horizontal position; bound to the *x* scale
 * **y** - the vertical position; bound to the *y* scale
-* **r** - the radius (area); bound to the *radius* scale, which defaults to *sqrt*
+* **r** - the radius (area); bound to the *r* (radius) scale, which defaults to *sqrt*
 * **rotate** - the rotation angle in degrees clockwise
 * **symbol** - the categorical symbol; bound to the *symbol* scale