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* Rows collection, similar to Columns * Doc * Some minor clean up * Make DataFrameRow a view into the DataFrame * sq * Address feedback * Remove DataFrame.RowCount * More row count changes * sq * Address feedback * Merge upstream
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Prashanth Govindarajan
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Dec 5, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
|
|
||
| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.Diagnostics; | ||
| using System.Text; | ||
|
|
||
| namespace Microsoft.Data.Analysis | ||
| { | ||
| /// <summary> | ||
| /// A DataFrameRow is a collection of values that represent a row in a <see cref="DataFrame"/>. | ||
| /// </summary> | ||
| public class DataFrameRow : IEnumerable<object> | ||
| { | ||
| private readonly DataFrame _dataFrame; | ||
| private readonly long _rowIndex; | ||
| internal DataFrameRow(DataFrame df, long rowIndex) | ||
| { | ||
| Debug.Assert(rowIndex < df.Columns.RowCount); | ||
| _dataFrame = df; | ||
| _rowIndex = rowIndex; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Returns an enumerator of the values in this row. | ||
| /// </summary> | ||
| public IEnumerator<object> GetEnumerator() | ||
| { | ||
| foreach (DataFrameColumn column in _dataFrame.Columns) | ||
| { | ||
| yield return column[_rowIndex]; | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// An indexer to return the value at <paramref name="index"/>. | ||
| /// </summary> | ||
| /// <param name="index">The index of the value to return</param> | ||
| /// <returns>The value at this <paramref name="index"/>.</returns> | ||
| public object this[int index] | ||
| { | ||
| get | ||
| { | ||
| return _dataFrame.Columns[index][_rowIndex]; | ||
| } | ||
| set | ||
| { | ||
| _dataFrame.Columns[index][_rowIndex] = value; | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// A simple string representation of the values in this row | ||
| /// </summary> | ||
| public override string ToString() | ||
| { | ||
| StringBuilder sb = new StringBuilder(); | ||
| foreach (object value in this) | ||
| { | ||
| sb.Append(value?.ToString() ?? "null").Append(" "); | ||
| } | ||
| return sb.ToString(); | ||
| } | ||
|
|
||
| IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
|
|
||
| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
|
|
||
| namespace Microsoft.Data.Analysis | ||
| { | ||
| /// <summary> | ||
| /// Represents the rows of a <see cref="DataFrame"/> | ||
| /// </summary> | ||
| public class DataFrameRowCollection : IEnumerable<DataFrameRow> | ||
| { | ||
| private readonly DataFrame _dataFrame; | ||
|
|
||
| /// <summary> | ||
| /// Initializes a <see cref="DataFrameRowCollection"/>. | ||
| /// </summary> | ||
| internal DataFrameRowCollection(DataFrame dataFrame) | ||
| { | ||
| _dataFrame = dataFrame ?? throw new ArgumentNullException(nameof(dataFrame)); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// An indexer to return the <see cref="DataFrameRow"/> at <paramref name="index"/> | ||
| /// </summary> | ||
| /// <param name="index">The row index</param> | ||
| public DataFrameRow this[long index] | ||
| { | ||
| get | ||
| { | ||
| return new DataFrameRow(_dataFrame, index); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Returns an enumerator of <see cref="DataFrameRow"/> objects | ||
| /// </summary> | ||
| public IEnumerator<DataFrameRow> GetEnumerator() | ||
| { | ||
| for (long i = 0; i < Count; i++) | ||
| { | ||
| yield return new DataFrameRow(_dataFrame, i); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// The number of rows in this <see cref="DataFrame"/>. | ||
| /// </summary> | ||
| public long Count => _dataFrame.Columns.RowCount; | ||
|
|
||
| IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); | ||
| } | ||
| } |
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