Sha256: 2d64a54780b49968caa4e625c537ec40f1a70470d4a470c8ca9a31c5a1a1a48e
Contents?: true
Size: 920 Bytes
Versions: 31
Compression:
Stored size: 920 Bytes
Contents
/* Inspired by Lee Byron's test data generator. */
function stream_layers(n, m, o) {
if (arguments.length < 3) o = 0;
function bump(a) {
var x = 1 / (.1 + Math.random()),
y = 2 * Math.random() - .5,
z = 10 / (.1 + Math.random());
for (var i = 0; i < m; i++) {
var w = (i / m - y) * z;
a[i] += x * Math.exp(-w * w);
}
}
return d3.range(n).map(function() {
var a = [], i;
for (i = 0; i < m; i++) a[i] = o + o * Math.random();
for (i = 0; i < 5; i++) bump(a);
return a.map(stream_index);
});
}
/* Another layer generator using gamma distributions. */
function stream_waves(n, m) {
return d3.range(n).map(function(i) {
return d3.range(m).map(function(j) {
var x = 20 * j / m - i / 3;
return 2 * x * Math.exp(-.5 * x);
}).map(stream_index);
});
}
function stream_index(d, i) {
return {x: i, y: Math.max(0, d)};
}
Version data entries
31 entries across 31 versions & 2 rubygems