Question

我想评估一个包含一些符号的表达式（在矩阵v中给出），其值在矩阵s: matrix([a,b,c]); v: matrix([1,2,3]); expr: a*b+c; ev(expr,s=v); /* not working but gives the idea of the purpose */中给出：

[a=1,b=2,c=3]

如何生成要传递给ev的正确作业列表{{1}}？

提前致谢。

Answer 1

经过很长时间我发布了second argument。我建议使用新的解决方案而不是下面的解决方案。

在Maxima邮件列表上，我找到了一种方法来生成要传递给[a=1,b=2,c=3]的分配列表ev，使用更通用的方法（允许使用A=B求解矩阵方程m2l(M):= xreduce('append,args(M)) $双方的unknonws - 从来没有用火焰喷射器煮热狗？）。只要矩阵可以转换为具有函数

的列表

[a=1,b=2,c=3]

可以通过

获取要传递给ev的作业列表

assign_list(s,v):= algsys(xreduce('append, args(s-v)), m2l(s)) $

因此，给定矩阵v，expr和表达式expr，ev(expr,assign_list(s,v));只需使用

进行评估

function Get-SEPVersion {
  # Connect to Registry
  try {
    $reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey("LocalMachine",$Server)

    # Create object to enable access to the months of the year
    DateTimeFormat = New-Object System.Globalization.DateTimeFormatInfo

    # Check OS Architecture
    $is64bitSystem = (Get-WmiObject Win32_OperatingSystem -computername $Server).OSArchitecture

    if ($is64bitSystem -eq "64-bit") {
      # Set Registry keys to query
      $SMCKey = "SOFTWARE\\Wow6432Node\\Symantec\\Symantec Endpoint Protection\\SMC"
      $AVKey = "SOFTWARE\\Wow6432Node\\Symantec\\Symantec Endpoint Protection\\AV"
      $SylinkKey = "SOFTWARE\\Wow6432Node\\Symantec\\Symantec Endpoint Protection\\SMC\\SYLINK\\SyLink"
    }
    if ($is64bitSystem -eq $true) {
      # Set Registry keys to query
      $SMCKey = "SOFTWARE\\Symantec\\Symantec Endpoint Protection\\SMC"
      $AVKey = "SOFTWARE\\Symantec\\Symantec Endpoint Protection\\AV"
      $SylinkKey = "SOFTWARE\\Symantec\\Symantec Endpoint Protection\\SMC\\SYLINK\\SyLink"
    }

    # Obtain Product Version value
    $SMCRegKey = $reg.opensubkey($SMCKey)
    $SEPVersion = $SMCRegKey.GetValue('ProductVersion')

    # Obtain Pattern File Date Value
    $AVRegKey = $reg.opensubkey($AVKey)
    $AVPatternFileDate = $AVRegKey.GetValue('PatternFileDate')

    # Obtain Pattern File Revision Value
    $AVRevisionKey = $AVRegKey.GetValue('PatternFileRevision')

    # Convert PatternFileDate to readable date
    $AVYearFileDate = [string]($AVPatternFileDate[0] + 1970)
    $AVMonthFileDate = $DateTimeFormat.MonthNames[$AVPatternFileDate[1]]
    $AVDayFileDate = [string]$AVPatternFileDate[2]
    $AVFileVersionDate = $AVDayFileDate + " " + $AVMonthFileDate + " " + $AVYearFileDate

    # Obtain Sylink Group value
    $SylinkRegKey = $reg.opensubkey($SylinkKey)
    $SylinkGroup = $SylinkRegKey.GetValue('CurrentGroup')

    $Credential = [System.Management.Automation.PSCredential]::Empty
    $hostdns = [System.Net.DNS]::GetHostEntry($Server)
               $OS = Get-WmiObject win32_operatingsystem -ComputerName $Server -ErrorAction Stop -Credential $Credential
               $BootTime = $OS.ConvertToDateTime($OS.LastBootUpTime)
               $Uptime = $OS.ConvertToDateTime($OS.LocalDateTime) - $boottime
    $MYObject = "" | Select-Object ComputerName,SEPProductVersion,SEPDefinitionDate,SylinkGroup,BootTime,UpTime
    $MYObject.ComputerName = $Server
    $MYObject.SEPProductVersion = $SEPVersion
    $MYObject.SEPDefinitionDate = "$AVFileVersionDate, Revision $AVRevisionKey"
    $MYObject.SylinkGroup = $SylinkGroup
    $MYObject.UpTime = $UpTime
    LogWrite "$Server, $SEPVersion, $AVFileVersionDate, Revision $AVRevisionKey, $SylinkGroup, $Boottime, $UpTime"
    $MYObject
  } catch {
    LogWrite  "$Server, - Manual Check Required"
    Write-Host "$Server - Manual Check Required"
  }
}

# Write Headers to the log file
function StartLog {
  Param ([string]$logstring)
  $Logfile = "C:\Temp\PS Scripts\Logs\SEP Status.log"
  $Logstring = "Computer, SEP Version, Def Date, Sylink Group, BootTime, Uptime"
  Add-Content $Logfile -Value $logstring
}

# Write results to a log file
function LogWrite {
  Param ([string]$logstring)
  $Logfile = "C:\Temp\PS Scripts\Logs\SEP Status.log"
  Add-Content $Logfile -Value $logstring
}

# Get list of Computers to process
function Get-FileName {
  [void][System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms")

  $OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
  $OpenFileDialog.filter = "Text Files (*.txt)|*.txt|CSV files (*.csv)|*.csv|All Files (*.*)|*.*" # Set the file types visible to dialog

  # Alternate filters include:
  # "CSV files (*.csv) | *.csv"

  $OpenFileDialog.InitialDirectory = "c:\test\"

  $OpenFileDialog.ShowDialog() | Out-Null
  $OpenFileDialog.FileName
}

# Main Script

StartLog
$filename = Get-FileName
$filecontents = Get-Content $filename
foreach ($Computername in $filecontents) {
  # Determine if the OS running this script is 32-bit
  if (Test-Connection -ComputerName $Server -Count 1 -Quiet -ErrorAction SilentlyContinue) {
    Get-SEPVersion
  } else {
    Write-Warning "$Server Offline or not responding to pings"
    LogWrite  "$Server, - is OFFLINE"
  }
}

Answer 2

You can use lists instead of matrices and create an adapter for subst

(%i1) msubst(a, b, c):=block([L: map(lambda([a0, b0], a0=b0), a, b)], subst(L, c)) $
(%i2) s   : [a,b,c] $
(%i3) v   : [1,2,3] $
(%i4) msubst(s, v, a*b+c);
(%o4)                                  5

If you need to convert a matrix to a list

(%i1) m2l(M):=block([L: []], matrixmap(lambda([e], push(e, L)), M), L) $
(%i2) s: matrix([a,b,c]) $
(%i3) m2l(s);
(%o3)                              [c, b, a]

Answer 3

有一个更简单的解决方案：

arm64-v8a

在我们的情况下，m2l(M):= xreduce('append,args(M)) $ massl(A,B):= map("=",m2l(A),m2l(B)) $ /*massl stands for "matrix assignment list"*/根据需要返回分配列表massl(s,v)。

千里马：将矩阵方程转换为赋值列表

3 个答案: