2d:null 2e:["$","title",null,{"children":"Scattered data interpolation with Radial Basis Functions | Theo Honohan | Observable"}] 33:T7de,function RBF(points, values, distanceFunction, epsilon) { var distance = distanceThinPlate; // `identity` here serves as a shorthand to allocate // the matrix nested array. var M = numeric.identity(points.length); // First compute the point to point distance matrix // to allow computing epsilon if it's not provided for(var j=0; j\n \n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":8,"value":"p = d3.line()(output)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":675,"value":"svg``","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":624,"value":"numeric = require('https://bundle.run/numericjs@1.2.6')","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":494,"value":"function distanceThinPlate(r) {\n if(r === 0) return 0;\n return Math.pow(r, 2) * Math.log(r);\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":499,"value":"function norm(pa, pb) {\n return numeric.norm2(numeric.sub(pb, pa));\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":489,"value":"$33","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":475,"value":"points = [0,1,2,3,4,5,7];","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":481,"value":"values = [0.1,0.4,1.2,0.3,2.0,1.2,0.5]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":483,"value":"interpolant = RBF(points, values)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":501,"value":"output = new Array(100);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":505,"value":"{for(var i=0; i<100; i++) {\n output[i] = [i*2,20*interpolant(i/20.0)];\n }\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":638,"value":"countrydata = FileAttachment(\"nations.json\").json()","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":641,"value":"usa_lifeExpectancy = countrydata[102][\"lifeExpectancy\"]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":646,"value":"usa_points = new Array(usa_lifeExpectancy.length)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":650,"value":"usa_values = new Array(usa_lifeExpectancy.length)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":645,"value":"{\n for(var i=0;i