how merge centroid?

[maodouchen]

var a = [1,2,3,4,5]
var b = [7,8,9,10]

var t1 = new TDigest()
t1.push(a);
var c1 = t1.toArray();

var t2 = new TDigest();
t2.push(b)
var c2 = t2.toArray()

var t = new TDigest();
t.push(c1);
t.push(c2);

t.summary()

i want merge centroids. Am i right?

[welch]

not the use case I envisioned. What do you mean by "am i right"?
(and what do you imagine is the right answer here?)

[maodouchen]

for example:

var TDigest = require('tdigest').TDigest;
var a = [1,2,3];
var t1 = new TDigest();
t1.push(a);
var c1 = t1.toArray(); // centroid1 collections

var b = [4,5,5]
var t2 = new TDigest();
t2.push(b);
var c2 = t2.toArray(); // centroid2 collections

var t = new TDigest();
c1.forEach((centroid) => {
const {mean, weight} = centroid;
t.push(mean, weight)
})
c2.forEach((centroid) => {
const {mean, weight} = centroid;
t.push(mean, weight)
})

t.percentile(0.8)

can i get 80% percentile of a.concat(b) [1,2,3,4,5,5]