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' Miscelaneous Math Functions for DWSIM
' Copyright 2008 Daniel Wagner O. de Medeiros
'
' This file is part of DWSIM.
'
' DWSIM is free software: you can redistribute it and/or modify
' it under the terms of the GNU General Public License as published by
' the Free Software Foundation, either version 3 of the License, or
' (at your option) any later version.
'
' DWSIM is distributed in the hope that it will be useful,
' but WITHOUT ANY WARRANTY; without even the implied warranty of
' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
' GNU General Public License for more details.
'
' You should have received a copy of the GNU General Public License
' along with DWSIM. If not, see <http://www.gnu.org/licenses/>.
Imports System.Linq
Namespace MathEx
Public Class Common
Shared Function CopyToVector(ByVal arr As ArrayList, ByVal index As Integer) As Double()
Dim i As Integer = 0
Dim values(arr.Count - 1) As Double
For i = 0 To arr.Count - 1
values(i) = arr(i)(index)
Next
Return values
End Function
Shared Function Max(ByVal Vv As Array, ByVal Vz As Array)
Dim n = UBound(Vv)
Dim mx As Double
If n >= 1 Then
Dim i As Integer = 1
mx = Vv(i - 1)
i = 0
Do
If Vv(i) > mx And Vz(i) <> 0 Then
mx = Vv(i)
End If
i += 1
Loop Until i = n + 1
Return mx
Else
If Vv.Length > 0 Then Return Vv(0) Else Return 0
End If
End Function
Shared Function Max(ByVal Vv As Array)
Dim n = UBound(Vv)
Dim mx As Double
If n >= 1 Then
Dim i As Integer = 1
mx = Vv(i - 1)
i = 0
Do
If Vv(i) > mx Then
mx = Vv(i)
End If
i += 1
Loop Until i = n + 1
Return mx
Else
If Vv.Length > 0 Then Return Vv(0) Else Return 0
End If
End Function
Shared Function Min(ByVal Vv As Array, ByVal Vz As Array)
Dim n = UBound(Vv)
Dim mx As Double
If n >= 1 Then
Dim i As Integer = 1
'Do
' mx = Vv(i - 1)
' i += 1
'Loop Until i = n + 1
mx = Vv(i - 1)
i = 0
Do
If Vv(i) < mx And Vz(i) <> 0 Then
mx = Vv(i)
End If
i += 1
Loop Until i = n + 1
Return mx
Else
If Vv.Length > 0 Then Return Vv(0) Else Return 0
End If
End Function
Shared Function Min(ByVal Vv As Array)
Dim n = UBound(Vv)
Dim mx As Double
If n >= 1 Then
Dim i As Integer = 1
Do
If Vv(i - 1) <> 0 Then
mx = Vv(i - 1)
Exit Do
End If
i += 1
Loop Until i = n + 2
i = i - 1
Do
If Vv(i) < mx Then
mx = Vv(i)
End If
i += 1
Loop Until i = n + 1
Return mx
Else
If Vv.Length > 0 Then Return Vv(0) Else Return 0
End If
End Function
Shared Function Sum(ByVal vx() As Double) As Double
If vx.Length = 0 Then Return 0
Return vx.Sum()
End Function
Shared Function AbsSum(ByVal vx() As Double) As Double
Dim n = UBound(vx)
Dim i As Integer
Dim sumv As Double = 0
For i = 0 To n
sumv += Math.Abs(vx(i))
Next
Return sumv
End Function
Shared Function WgtAvg(ByVal vw() As Double, ByVal vx() As Double) As Double
Dim n = UBound(vx)
Dim i As Integer
Dim sumv As Double = 0
Dim total As Double = 0.0#
For i = 0 To n
total += vw(i)
Next
For i = 0 To n
sumv += vw(i) * vx(i) / total
Next
Return sumv
End Function
Shared Function SumSqr(ByVal vx() As Double) As Double
Dim n = UBound(vx)
Dim i As Integer
Dim sumv As Double = 0.0#
For i = 0 To n
sumv += Math.Pow(vx(i), 2)
Next
Return sumv
End Function
End Class
End Namespace
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