Comments (6)
I found the case while wanting to transform a domain extent (that accepts -Infinity and Infinity as valid) to a range extent, something like:
[-Infinity, Infinity].map(d3.scaleLinear())
and I expected having [-Infinity, Infinity] as the output, but got [NaN, NaN]
instead.
It's not difficult to test for this case in my application, but I was wondering if it was the "normal" behavior. If it is, OK for me to close the issue.
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Related to #73
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Two possible implementations as discussed on https://d3js.zulipchat.com/#narrow/stream/273725-D3/topic/d3-scale
isFinite(t) ? a * (1 - t) + b * t : (b - a) * t + a
and
(t * t !== Infinity) ? a * (1 - t) + b * t : (b - a) * t + a
from d3-interpolate.
It’s doing exactly what it’s documented to do, so I’m not sure I consider this a bug. 0 * Infinity is NaN. Why is it useful to support Infinity?
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For the record, another possible implementation by Jacob Rus:
lerp = (a, b, t) => {
var y = a * (1 - t) + b * t;
return (y === y) ? y : (b - a) * t
}
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It’s doing exactly what it’s documented to do, so I’m not sure I consider this a bug.
0 * Infinity
isNaN
. Why is it useful to supportInfinity
?
This scale is a way of defining a certain linear function f. In the event that the slope is not 0, f(∞) should theoretically be ±∞, not undefined.
(Whether it is important or useful to support this edge case is debatable.)
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