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Issue-#4: Add Support for saving state #5

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Issue-#4: Add Support for saving state #5

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39be4c5
Issue-#4: Add support for saving state
Jul 18, 2016
06592a4
Merge pull request #1 from daxbert/issue-#4
daxbert Jul 18, 2016
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40 changes: 40 additions & 0 deletions tdigest.js
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,25 @@ function TDigest(delta, K, CX) {
this.reset();
}

TDigest.prototype.load = function( tdObject ) {
// given a javascript object, re-initialize ourselves
//
// save: is not implemented as JSON.stringify(TDigest object) works just fine
//

//clear & reload
this.centroids.clear();
this._traverse(tdObject.centroids._root);

// init all internal variables based on object
this.delta = tdObject.delta;
this.K = tdObject.K;
this.CX = tdObject.CX;
this.n = tdObject.n;
this.nreset = tdObject.nreset;
this.last_cumulate = tdObject.last_cumulate;
};

TDigest.prototype.reset = function() {
// prepare to digest new points.
//
Expand Down Expand Up @@ -141,6 +160,25 @@ TDigest.prototype.find_nearest = function(x) {
}
};

TDigest.prototype._traverse = function(obj) {
if ( obj.left ) {
this._traverse(obj.left);
}
if ( obj.right ) {
this._traverse(obj.right);
}
if (obj.data) {
this._insert_centroid(obj.data);
}
}

TDigest.prototype._insert_centroid = function(obj) {
// insert a centroid into the digest
//
this.centroids.insert(obj);
this.n += obj.n;
};

TDigest.prototype._new_centroid = function(x, n, cumn) {
// create and insert a new centroid into the digest (don't update
// cumulatives).
Expand Down Expand Up @@ -294,6 +332,8 @@ TDigest.prototype._percentile = function(p) {
return undefined;
}
this._cumulate(true); // be sure cumns are exact
var min = this.centroids.min();
var max = this.centroids.max();
var h = this.n * p;
var bound = this.bound_mean_cumn(h);
var lower = bound[0], upper = bound[1];
Expand Down