ignore non-finite values when inferring domain

src/defined.js

@@ -23,12 +23,16 @@ export function filter(index, ...channels) {
   return index;
 }
 
+export function finite(x) {
+  return isFinite(x) ? x : NaN;
+}
+
 export function positive(x) {
-  return x > 0 ? x : NaN;
+  return x > 0 && isFinite(x) ? x : NaN;
 }
 
 export function negative(x) {
-  return x < 0 ? x : NaN;
+  return x < 0 && isFinite(x) ? x : NaN;
 }
 
 export function firstof(...values) {

src/scales/quantitative.js

@@ -23,7 +23,7 @@ import {
 } from "d3";
 import {ordinalRange, quantitativeScheme} from "./schemes.js";
 import {registry, radius, opacity, color} from "./index.js";
-import {positive, negative} from "../defined.js";
+import {positive, negative, finite} from "../defined.js";
 import {constant} from "../mark.js";
 import {order} from "../scales.js";
 
@@ -159,15 +159,15 @@ export function ScaleIdentity() {
   return {type: "identity", scale: scaleIdentity()};
 }
 
-export function inferDomain(channels, f) {
+export function inferDomain(channels, f = finite) {
   return channels.length ? [
     min(channels, ({value}) => value === undefined ? value : min(value, f)),
     max(channels, ({value}) => value === undefined ? value : max(value, f))
   ] : [0, 1];
 }
 
 function inferZeroDomain(channels) {
-  return [0, channels.length ? max(channels, ({value}) => value === undefined ? value : max(value)) : 1];
+  return [0, channels.length ? max(channels, ({value}) => value === undefined ? value : max(value, finite)) : 1];
 }
 
 // We don’t want the upper bound of the radial domain to be zero, as this would

test/plots/index.js

@@ -53,6 +53,7 @@ export {default as identityScale} from "./identity-scale.js";
 export {default as industryUnemployment} from "./industry-unemployment.js";
 export {default as industryUnemploymentShare} from "./industry-unemployment-share.js";
 export {default as industryUnemploymentStream} from "./industry-unemployment-stream.js";
+export {default as infinityLog} from "./infinity-log.js";
 export {default as learningPoverty} from "./learning-poverty.js";
 export {default as letterFrequencyBar} from "./letter-frequency-bar.js";
 export {default as letterFrequencyCloud} from "./letter-frequency-cloud.js";

test/plots/infinity-log.js

@@ -0,0 +1,5 @@
+import * as Plot from "@observablehq/plot";
+
+export default function() {
+  return Plot.dotX([NaN, 0.2, 0, 1, 2, 1 / 0]).plot({x: {type: "log", tickFormat: "f"}});
+}