2019-05-22 19:02:42 +08:00
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#Region "Microsoft.VisualBasic::10c538a5029327a24db621be937c1762, Microsoft.VisualBasic.Core\Scripting\Expressions\Aggregate.vb"
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2018-08-02 20:14:48 +08:00
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Module Aggregate
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' Function: GetAggregateFunction
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' /********************************************************************************/
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#End Region
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Imports System.Runtime.CompilerServices
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Namespace Scripting.Expressions
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Public Module Aggregate
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''' <summary>
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''' Get ``Aggregate`` function by term.
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''' </summary>
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''' <param name="name$">
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''' + max
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''' + min
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''' + average
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''' </param>
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''' <returns></returns>
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'''
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<Extension> Public Function GetAggregateFunction(name$) As Func(Of IEnumerable(Of Double), Double)
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Select Case LCase(name)
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Case "max"
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Return Function(x) x.Max
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Case "min"
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Return Function(x) x.Min
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Case "average", "avg", "mean"
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Return Function(x) x.Average
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Case Else
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Throw New NotImplementedException(name)
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End Select
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End Function
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End Module
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End Namespace
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