fromJson function

Future<DataFrame> fromJson(String fileName)

Creates a DataFrame instance from a previously persisted json file

A usage example:

import 'package:ml_dataframe/ml_dataframe.dart';

void main() async {
  final data = DataFrame([
    ['feature_1', 'feature_2', 'feature_3'],
    [1, 10, 100],
    [2, 20, 200],
    [3, 30, 300],
  ]);

  await data.saveAsJson('path/to/json_file.json');

  // ...

  final restoredDataFrame = await fromJson('path/to/json_file.json');

  print(restoredDataFrame);
  // DataFrame (3 x 3)
  // feature_1 feature_2 feature_3
  //         1        10       100
  //         2        20       200
  //         3        30       300
}

Implementation

Future<DataFrame> fromJson(String fileName) async {
  final file = File(fileName);
  final dataAsString = await file.readAsString();
  final decoded = jsonDecode(dataAsString) as Map<String, dynamic>;

  return DataFrameImpl.fromJson(decoded);
}