我有一个我想扩展的shapefile（基本上添加了一些NA行和列）。是否有像raster::extend这样的功能？不幸的是，这仅适用于raster个对象。
我可以使用raster::crop裁剪它，SpatialPolygonsDataFrame有Public Sub emailList()
'Setting up the Excel variables.
Dim olApp As Object
Dim olMailItm As Object
Dim iCounter As Integer
Dim Dest As Variant
Dim SDest As String
'Create the Outlook application and the empty email.
Set olApp = CreateObject("Outlook.Application")
Set olMailItm = olApp.CreateItem(0)
'Using the email, add multiple recipients, using a list of addresses in column A.
With olMailItm
SDest = ""
For iCounter = 1 To WorksheetFunction.CountA(Workbooks("Book1.xls").Sheets(1).Columns(1))
If SDest = "" Then
SDest = Range.Cells(iCounter, 1).Value
Else
SDest = SDest & ";" & Range.Cells(iCounter, 1).Value
End If
Next iCounter
'Do additional formatting on the BCC and Subject lines, add the body text from the spreadsheet, and send.
.BCC = SDest
.Subject = "FYI"
.Body = ActiveSheet.TextBoxes(1).Text
.Send
End With
'Clean up the Outlook application.
Set olMailItm = Nothing
Set olApp = Nothing
End Sub
的方法，但我无法找到任何扩展方法。
答案 0 :(得分：2)
我找到了办法！
SpatialPolygons的范围数据似乎存储在名为bbox的插槽中。在插槽内（您可以通过my.polygon@bbox访问），您将找到一个像这样的简单矩阵：
min max
x -81 -80
y 11 12
只需将另一个矩阵替换为您想要获得的矩阵，就会改变SpatialPolygons的范围。您甚至可以使用其他多边形或栅格的范围来制作矩阵：
my.polygon@bbox <- as.matrix(extent(my.raster))
它不像光栅延伸那么整洁......但它的工作方式相同:) 希望现在还不晚！