class static

qm.RecordVector

Source: qminerdoc.js:1631

Vector storing records defined by value. Vector can be serialized and iterated over. For storing records by reference use module:qm.RecordSet or module:la.IntVector.

Property

length

Methods

push(rec)
save(fout)

new RecordVector(base[, fin])

Vector of records by value.

Example 

// import qm module
var qm = require('qminer');
// create a new base containing one store
var base = new qm.Base({
   mode: "createClean",
   schema: [{
       name: "Philosophers",
       fields: [
           { name: "Name", type: "string" },
           { name: "Era", type: "string" }
       ]
   }]
});
// Create record vector
var recordVector = new qm.RecordVector(base);
// Add some records to the vector
recordVector.push(base.store("Philosophers").newRecord({ Name: "Plato", Era: "Ancient philosophy" }));
recordVector.push(base.store("Philosophers").newRecord({ Name: "Immanuel Kant", Era: "18th-century philosophy" }));
recordVector.push(base.store("Philosophers").newRecord({ Name: "Emmanuel Levinas", Era: "20th-century philosophy" }));
recordVector.push(base.store("Philosophers").newRecord({ Name: "Rene Descartes", Era: "17th-century philosophy" }));
recordVector.push(base.store("Philosophers").newRecord({ Name: "Confucius", Era: "Ancient philosophy" }));
// Iterate over all records
for (var i = 0; i < recordVector.length; i++) {
   var rec = recordVector[i];
   var tite = rec.Name + " (" + rec.Era + ")";
}
base.close();

Parameters

Name Type Optional Description

base

module:qm.Base

 

Qminer base object.

fin

module:fs.FIn

Yes

Load vector from input stream.

Property

length

Gives the number of records. Type number.

Methods

push(rec) → number

Adds a new record to the vector.

Example 

// import qm module
var qm = require('qminer');
// create a new base containing one store
var base = new qm.Base({
   mode: "createClean",
   schema: [{
       name: "Philosophers",
       fields: [
           { name: "Name", type: "string" },
           { name: "Era", type: "string" }
       ]
   }]
});
// Create record vector
var recordVector = new qm.RecordVector(base);
// Add some records to the vector
recordVector.push(base.store("Philosophers").newRecord({ Name: "Plato", Era: "Ancient philosophy" }));
base.close();

Parameter

Name Type Optional Description

rec

module:qm.Record

 

The added record. The record must be provided by value.
Returns

numberB The position of the added record in the vector.

save(fout) → module:fs.FOut

Saves the vector into the output stream.

Example 

// import qm module
var qm = require('qminer');
var fs = require('qminer').fs;
// create a new base containing one store
var base = new qm.Base({
   mode: "createClean",
   schema: [{
       name: "Philosophers",
       fields: [
           { name: "Name", type: "string" },
           { name: "Era", type: "string" }
       ]
   }]
});
// Create record vector
var recordVector = new qm.RecordVector(base);
// Add some records to the vector
recordVector.push(base.store("Philosophers").newRecord({ Name: "Plato", Era: "Ancient philosophy" }));
// save to disk
var fout = fs.openWrite('record_vector.bin');
recordVector.save(fout).close();
// load into a new vector
var fin = fs.openRead('record_vector.bin');
var recordVector2 = new qm.RecordVector(base, fin);
base.close();

Parameter

Name Type Optional Description

fout

module:fs.FOut

 

Output stream.
Returns

module:fs.FOutB The output stream fout.