Merge 2aa0b2d into 1ef2d46

README.md

@@ -11,7 +11,7 @@ A dataframe for Dart
 From csv:
 
    ```dart
-   final df = await DataFrame.fromCsv("dataset/stocks.csv");
+   final df = await DataFrame.fromCsv('dataset/stocks.csv');
    ```
 
 Note: the type of the records are infered from the data. The first line of the csv must contains the headers for the column names. Optional parameters:
@@ -28,8 +28,8 @@ From records:
 
    ```dart
    final rows = <Map<String, dynamic>> rows[
-      <String, dynamic>{"col1": 21, "col2": "foo", "col3": DateTime.now()},
-      <String, dynamic>{"col1": 22, "col2": "bar", "col3": DateTime.now()},
+      <String, dynamic>{'col1': 21, 'col2': 'foo', 'col3': DateTime.now()},
+      <String, dynamic>{'col1': 22, 'col2': 'bar', 'col3': DateTime.now()},
    ];
    final df = DataFrame.fromRows(rows);
    ```
@@ -41,7 +41,7 @@ From records:
    // select a subset of rows
    final List<Map<String, dynamic>> rows = df.subset(0,100);
    /// select records for a column
-   final List<double> values = df.colRecords<double>("col2");
+   final List<double> values = df.colRecords<double>('col2');
    /// select list of records
    final List<List<dynamic>> records = df.records;
    ```
@@ -52,7 +52,7 @@ Add data:
 
    ```dart
    // add a row
-   df.addRow(<String,dynamic>{"col1": 1, "col2": 2.0});
+   df.addRow(<String,dynamic>{'col1': 1, 'col2': 2.0});
    // add a line of records
    df.addRecord(<dynamic>[1, 2.0]);
    ```
@@ -82,17 +82,17 @@ Copy a dataframe:
 Nulls and zeros:
 
    ```dart
-   final int n = df.countNulls_("col1");
-   final int n = df.countZeros_("col1");
+   final int n = df.countNulls_('col1');
+   final int n = df.countZeros_('col1');
    ```
 
 Columns:
 
    ```dart
-   final int mean = df.mean("col1");
-   final int sum = df.sum("col1");
-   final int max = df.max("col1");
-   final int min = df.min("col1");
+   final int mean = df.mean('col1');
+   final int sum = df.sum('col1');
+   final int max = df.max('col1');
+   final int min = df.min('col1');
    ```
 
 ### Info

example/main.dart

@@ -1,8 +1,8 @@
 import 'package:df/df.dart';
 
 Future<void> main() async {
-  final df = await DataFrame.fromCsv("dataset/stocks.csv",
-      dateFormat: "MMM dd yyyy", verbose: true);
+  final df = await DataFrame.fromCsv('dataset/stocks.csv',
+      dateFormat: 'MMM dd yyyy', verbose: true);
   df.show();
   print(df.columns);
 }

lib/src/column.dart

@@ -40,7 +40,7 @@ class DataFrameColumn {
 
   @override
   String toString() {
-    return "$name ($type)";
+    return '$name ($type)';
   }
 
   @override

lib/src/df.dart

@@ -121,7 +121,7 @@ class DataFrame {
       bool verbose = false}) async {
     final file = File(path);
     if (!file.existsSync()) {
-      throw FileNotFoundException("File not found: $path");
+      throw FileNotFoundException('File not found: $path');
     }
     final df = DataFrame();
     var i = 1;
@@ -132,7 +132,7 @@ class DataFrame {
         .transform<String>(const LineSplitter())
         .forEach((line) {
       //print('line $i: $line');
-      final vals = line.split(",");
+      final vals = line.split(',');
       if (i == 1) {
         // set columns names
         _colNames = vals;
@@ -160,7 +160,7 @@ class DataFrame {
       ++i;
     });
     if (verbose) {
-      print("Parsed ${df._matrix.data.length} rows");
+      print('Parsed ${df._matrix.data.length} rows');
     }
     return df;
   }
@@ -232,10 +232,10 @@ class DataFrame {
   int countNulls_(String colName,
       {List<dynamic> nullValues = const <dynamic>[
         null,
-        "null",
-        "nan",
-        "NULL",
-        "N/A"
+        'null',
+        'nan',
+        'NULL',
+        'N/A'
       ]}) {
     final n = _matrix.countForValues(_indiceForColumn(colName), nullValues);
     return n;
@@ -307,13 +307,13 @@ class DataFrame {
     }
     final rows = _matrix.data.sublist(0, l);
     _info.printRows(rows);
-    print("$length rows");
+    print('$length rows');
   }
 
   /// Print info and sample data
   void show([int lines = 5]) {
     print(
-        "${_columns.length} columns and $length rows: ${columnsNames.join(", ")}");
+        '${_columns.length} columns and $length rows: ${columnsNames.join(', ')}');
     var l = lines;
     if (length < lines) {
       l = length;
@@ -389,7 +389,7 @@ class DataFrame {
       ++i;
     }
     if (ind == null) {
-      throw ColumnNotFoundException("Can not find column $colName");
+      throw ColumnNotFoundException('Can not find column $colName');
     }
     return ind;
   }

pubspec.yaml

@@ -7,11 +7,11 @@ environment:
   sdk: ">=2.4.0 <3.0.0"
 
 dependencies:
-  meta: ^1.1.8
-  pedantic: ^1.8.0
   extra_pedantic: ^1.1.1+3
-  ml_linalg: ^12.7.1
   jiffy: ^3.0.1
+  meta: ^1.1.8
+  ml_linalg: ^12.7.1
+  pedantic: ^1.8.0
 
 dev_dependencies:
   test: ^1.6.5