Comments (2)
Regarding the first or last bin not being the same width as the others: that is because given n thresholds, n + 1 bins will be produced. The first bin (bins[0]
) contains any value less than the first threshold (thresholds[0]
); the last bin (bins[thresholds.length]
) contains any value greater than or equal to the last threshold (thresholds[thresholds.length - 1]
).
If you prefer, you can consider the effective width of the first and last bin as infinite, since they are bounded only by the input data (or more precisely the histogram’s domain) and not the thresholds. The bins[0].x0
is equal to domain[0]
and bins[thresholds.length].x1
is equal to domain[1]
given the histogram’s domain, which defaults to the extent of the input data.
If you want to force the domain to coincide exactly with the tick interval, you can use d3.range to manually create the ticks as you discuss in option 3. If you also want the tick thresholds to be “human-readable” (per the design of d3.ticks) you can nice your domain before computing the ticks, and then use scale.ticks:
var data = [1, 2, 3, 4, 4.7];
var count = 5;
var x = d3.scaleLinear().domain(d3.extent(data)).nice(count);
var histogram = d3.histogram().domain(x.domain()).thresholds(x.ticks(count));
var bins = histogram(data);
console.log("bin widths: " + bins.map(b => b.x1 - b.x0));
You could also use d3.tickStep to nice your histogram’s domain manually, but that’s exactly what linear.nice does.
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Thank you for the detailed answer – I wish you a happy new year 🎉 🍾 🎆
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Related Issues (20)
- BUG: d3-array/dist/d3-array.js: Unexpected token (139:15) HOT 4
- fix(babel): cumsum HOT 1
- binary ticks increments on linear scale HOT 2
- D3-array produces ERR_REQUIRE_ESM with node >= 15 HOT 3
- bisectCenter naming HOT 1
- quantile returns undefined on an empty array, differs from extent HOT 1
- Docs: define the bin thresholds with array HOT 2
- First and last thresholds are set to data extent (not explicitly stated limits) HOT 2
- bisector no longer supports two-argument (object, value) comparator HOT 12
- Testing a lib using `d3-array` HOT 1
- d3.blur HOT 1
- Incorrect results for binary search on large arrays due to miscomputation of midpoint HOT 11
- d3.bin can mutate the user-specified thresholds
- About the sorting problem of d3.rank HOT 2
- Insecure Randomness for the useof Math.random() in shuffle API (security vulnerability) HOT 1
- d3.thresholdScott returns NaN for single-element arrays
- Feature request: `find` / `findValue` methods
- groupSort should use ascendingDefined instead of ascending
- medianIndex/quantileIndex doesn’t handle missing data HOT 3
- can d3-array also support BigInt numbers? HOT 2
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