VBA從列表中隨機抽取名稱不起作用

Question

我想從數千名作者的列表（動態範圍）中隨機抽取280個名稱，然後將它們連接成1個字符串，每個名稱由OR分隔。

到目前爲止，我被困在第一部分。當我運行下面的代碼時，沒有任何反應。誰能解釋爲什麼？謝謝。

Sub Authors() 

Dim InputRange As Range 
Dim AuthorCount As Long 
Dim AuthorRange As Excel.Range 

Set InputRange = Range("A:A") 
AuthorCount = Application.WorksheetFunction.CountA(InputRange) - 1 

Set AuthorRange = ThisWorkbook.Worksheets("Sheet").Range("A2:A" & AuthorCount) 

Const nItemsToPick As Long = 280 

Dim Authorlist As Variant 
Dim i As Long 

ReDim Authorlist(1 To nItemsToPick) 
For i = 1 To nItemsToPick 
    Authorlist(i) = AuthorRange.Cells(Int(AuthorCount * Rnd + 1), 1) 
Next i 
End Sub 

Answer 1

從您的意見，你似乎想要連接的字符串數組，然後把它放回到Excel。這一點，把剛剛End Sub前，都會把它放到單元格B1例如：

ThisWorkbook.Worksheets("Sheet1").Range("B1").Value = Join(Authorlist, "OR") 

Answer 2

此功能從arr陣列挑選nItemsToPick隨機元素起來，並使它們返回到一個數組：

Function PickNRandomElementsFromArray(arr As Variant, nItemsToPick As Long) As Variant 
    Dim arrSize As Long 
    Dim i As Long, iPick As Long 
    Dim temp As String 

    arrSize = UBound(arr) '<--| count the values as the array size 
    If nItemsToPick > arrSize Then nItemsToPick = arrSize '<--| the items to be picked cannot exceed array size 
    For i = 1 To nItemsToPick 
     iPick = Int((arrSize - (i - 1)) * Rnd + 1) + (i - 1) '<--| pick a random number between 'i' and 'arrSize' 

     ' swap array elements in slots 'i' and 'iPick' 
     temp = arr(iPick) 
     arr(iPick) = arr(i) 
     arr(i) = temp 
    Next i 
    ReDim Preserve arr(1 To nItemsToPick) '<--| resize the array to first picked items 
    PickNRandomElementsFromArray = arr '<--| return the array 
End Function 

你可以利用如下：

Option Explicit 

Sub Authors() 
    Dim Authors As Variant, AuthorsList As Variant 

    With ThisWorkbook.Worksheets("Sheet") '<--| reference your relevant worksheet 
     Authors = Application.Transpose(.Range("A2", .Cells(.rows.count, 1).End(xlUp)).Value) '<--| fill 'Authors' array with its column "A" values from row 2 down to its last not empty one 
     AuthorsList = PickNRandomElementsFromArray(Authors, 280) '<--| fill 'AuthorsList' array with a selection of 280 random elements of 'Authors' 
     .Range("B1").Value = Join(AuthorsList, " OR ") '<--| fill cell "B1" with a string build by concatenating 'AuthorsList' values delimited with " OR " 
    End With 
End Sub 

可以相當收縮（和作出更可讀）到：

Sub Authors() 
    With ThisWorkbook.Worksheets("Sheet") '<--| reference your relevant worksheet 
     .Range("B1").Value = Join(PickNRandomElementsFromArray(Application.Transpose(.Range("A2", .Cells(.rows.count, 1).End(xlUp)).Value), 280), " OR ") 
    End With 
End Sub 

Answer 3

使用下面的代碼

Sub PickSample(intSampleSize As Integer, intPicks As Integer) 
    Dim arr() As String 
Dim intCounter As Integer 

ReDim arr(intPicks) 

For intCounter = 0 To UBound(arr) 
    arr(intCounter) = CStr(Int((intSampleSize - (i - 1)) * Rnd + 1) + (i - 1)) 
Next intCounter 

Debug.Print Join(arr(), ",") 

End Sub 

我跑這個放在下面，PickSample（10,5），並得到了以下，顯示出重複的可能性，這將不再爲拾取器間的差異並且樣本增加。

9,9,6,10,10,2 
5,3,6,7,2,3 
10,4,5,8,0,6 
9,8,4,10,9,0 
0,8,8,7,0,4 
7,5,6,3,3,8 

如果你的選擇是280，但數據集只有300，易受騙的人仍可能出現

PickSample 300,280 228,**92**,248,216,269,66,**107**,166,**107**,61,174,189,41,18,190,252,192,127,56,149,292,231,114,145,164,202,11,194,270,102,35,128,232,**107**,124,225,131,216,152,52,83,26,294,85,186,**92**,256,96,239,52,90,21,148,136,179,9,95,40,98,228,188,290,249,166,182,57,271,95,180,179,230,215,206,228,77,165,153,170,84,125,105,292,156,175,139,9,113,41,196,46,59,112,28,185,211,132,126,101,210,64,13,266,13,138,222,227,247,63,141,261,249,123,139,105,75,242,163,162,188,26,214,77,17,82,289,98,194,109,111,98,64,63,127,185,72,206,177,181,23,13,46,74,120,175,86,251,270,158,116,0,75,49,194,295,93,72,264,39,171,182,183,208,255,29,118,247,80,204,119,251,130,251,65,220,270,65,295,290,262,157,195,137,47,193,184,257,110,15,152,16,112,135,89,291,3,195,184,160,8,215,94,295,87,109,96,106,70,178,211,80,173,173,298,280,75,243,231,122,189,148,150,40,291,53,177,205,32,195,222,234,129,24,150,172,17,124,35,43,94,298,181,82,125,141,19,137,131,284,82,52,152,103,154,119,78,20,192,109,164,265,127,178,114,17,32,43,43,228,79,41,12,208,254,155,240,296,157,20,188,99,83 4,50,49,153,122,31,83,193,255,149,56,269,112,97,232,65,134,71,264,183,112,117,259,176,280,155,99,261,77,78,53,104,0,223,253,83,211,121,244,223,131,23,123,102,213,93,240,45,178,287,73,282,34,296,190,180,271,173,73,258,22,132,228,73,113,119,158,81,174,63,23,269,33,196,271,69,285,254,132,148,231,251,115,58,98,124,45,186,29,61,208,151,55,298,141,1,128,86,226,268,247,53,32,3,45,113,56,294,262,175,219,43,77,8,249,235,238,100,135,167,241,169,61,62,109,172,103,158,128,172,15,164,62,289,280,298,252,123,242,297,77,52,209,5,102,208,33,33,87,120,168,93,88,243,93,113,120,253,123,218,198,122,286,194,155,67,175,225,137,272,85,200,267,84,110,4,88,296,229,174,182,80,152,238,258,28,163,125,22,135,210,150,122,284,296,178,160,185,26,55,85,5,45,126,165,168,235,12,122,17,93,181,155,179,99,273,231,173,129,220,49,17,73,228,286,103,205,238,10,239,145,62,181,273,284,196,4,199,290,2,287,22,88,175,243,12,16,169,94,124,153,220,135,97,22,123,172,229,174,196,243,125,239,217,208,219,57,232,21,74,286,246,66,55,71,278,77,77,215,200,232 209,294,73,160,32,300,203,4,173,30,31,240,85,13,89,114,90,285,294,120,83,48,49,194,123,124,214,98,190,62,55,175,24,137,272,78,236,114,87,276,190,188,128,29,168,209,275,251,6,163,275,129,204,151,154,139,106,121,81,16,73,294,18,117,109,147,46,142,77,189,163,47,282,197,152,117,32,235,138,226,179,250,5,63,22,31,99,38,0,161,197,163,249,24,57,204,136,107,45,212,279,159,26,228,120,139,148,62,99,28,177,51,279,29,133,82,262,225,82,202,77,27,9,97,237,89,70,144,76,102,13,145,62,260,177,227,279,99,163,24,190,123,289,34,277,186,104,44,144,66,299,39,8,103,164,277,162,122,255,248,202,217,300,102,149,124,209,53,127,163,245,162,128,153,68,186,147,204,266,111,91,88,45,159,67,175,109,263,143,57,205,224,184,235,48,243,60,287,19,18,238,114,139,35,34,52,14,215,160,168,65,140,224,226,120,271,224,26,191,214,4,129,120,82,296,241,209,125,221,83,107,130,284,36,194,104,31,55,23,130,288,163,148,292,65,114,119,84,151,41,155,290,167,273,197,132,208,19,227,210,149,46,67,98,236,15,155,227,241,97,292,242,203,272,263,125,37,287,239,209,120

使用字典來處理受騙者，使用此代碼

Sub PickSample(intSampleSize As Integer, intPicks As Integer) 

Dim dicPicked As New Scripting.Dictionary 
Dim arr() As String 
Dim intCounter As Integer 
Dim intPicked As Integer 
ReDim arr(intPicks) 

For intCounter = 0 To UBound(arr) 
RetryPick: 
    intPicked = CStr(Int((intSampleSize - (i - 1)) * Rnd + 1) + (i - 1)) 
    If dicPicked.Exists(CStr(intPicked)) Then 
     GoTo RetryPick 
    Else 
     dicPicked.Add CStr(intPicked), 1 
     arr(intCounter) = intPicked 
    End If 
Next intCounter 

Debug.Print Join(arr(), ",") 

dicPicked.RemoveAll 
Set dicPicked = Nothing 

End Sub 

給出結果，希望免費愚弄

PickSample 300,280 203,125,69,114,26,208,39,219,36,174,220,113,24,74,104,282,128,112,223,205,200,147,44,143,152,162,157,300,70,54,108,177,13,276,153,91,7,168,89,145,127,12,16,257,187,229,61,213,117,214,254,171,59,242,23,51,224,52,185,165,193,189,21,296,63,173,160,280,190,232,235,141,256,56,87,98,32,5,267,195,77,120,197,82,288,68,57,136,132,182,122,15,47,48,261,96,110,258,49,105,155,86,186,97,225,80,264,140,11,46,199,230,275,19,34,83,222,66,116,294,298,259,292,271,272,84,115,101,124,43,183,71,289,291,25,188,55,158,150,216,243,92,58,0,290,148,255,149,250,167,27,233,228,265,9,299,65,283,62,88,207,240,109,179,161,178,268,278,175,139,237,234,169,297,269,281,184,262,270,164,202,279,253,295,196,212,8,274,159,75,172,163,130,38,154,73,99,247,249,263,273,67,40,20,221,138,14,33,218,286,227,251,94,166,209,156,211,37,137,90,131,111,107,2,215,85,146,100,293,204,231,285,79,53,126,60,239,260,248,78,4,217,29,64,121,226,201,210,45,206,134,17,1,192,246,3,35,191,236,93,28,41,244,287,129,277,142,118,6,81,18,135,181,241,180,103,50,252,31,95,30 44,278,132,10,232,56,146,193,284,276,236,155,79,117,102,61,119,200,229,131,138,133,235,173,204,34,7,98,3,202,167,143,130,30,126,206,13,262,221,166,174,298,111,116,39,288,263,76,47,170,89,268,154,253,52,91,217,148,12,22,83,33,77,264,85,214,55,127,279,251,101,86,230,35,172,59,198,62,286,296,220,29,191,242,271,5,54,84,297,158,38,270,231,107,95,110,57,129,9,273,53,269,68,4,234,228,211,207,70,153,151,194,179,128,169,63,142,109,145,58,186,24,245,60,87,0,17,246,225,222,218,184,258,26,161,226,247,31,144,178,223,122,88,124,137,210,293,94,99,213,190,281,80,72,104,40,6,123,290,259,254,45,78,66,227,289,261,141,65,135,8,274,69,257,203,168,196,42,248,67,73,125,37,11,287,181,92,291,238,108,212,1,118,28,216,244,164,249,240,150,46,74,277,36,189,188,255,224,195,260,15,175,267,280,49,180,27,165,50,113,243,201,237,149,205,156,199,292,136,48,71,75,285,41,81,239,209,185,266,160,176,152,171,163,100,2,32,183,16,97,19,294,187,20,282,272,157,182,121,140,106,112,265,295,51,21,256,64,241,114,162,90,252,115,25,82,103,23,299,120,197 57,241,105,1,247,289,284,72,89,68,101,225,295,242,290,5,291,217,267,87,62,80,24,106,103,38,285,197,286,300,151,222,219,254,201,113,195,245,243,15,179,98,145,192,74,118,142,109,70,58,11,4,154,277,129,115,250,202,293,163,181,168,288,268,281,112,79,49,60,175,236,23,266,186,59,167,190,187,41,228,174,157,48,231,165,253,227,171,66,176,135,238,120,258,19,110,194,164,131,296,91,206,159,255,8,189,124,148,114,13,75,121,95,272,119,214,50,117,279,213,205,133,96,196,137,173,246,218,233,77,27,264,141,184,193,263,102,83,244,210,78,127,36,63,188,42,0,152,198,271,169,298,207,111,3,158,182,282,30,226,199,17,273,297,191,166,46,144,252,55,25,26,200,86,162,237,211,299,212,287,161,12,40,45,69,216,54,125,71,47,132,93,22,20,76,126,51,262,107,229,234,257,2,39,278,235,84,37,280,208,153,251,67,136,104,28,221,149,248,276,170,140,14,269,180,16,108,34,94,43,92,52,204,65,134,85,183,7,146,143,97,270,64,259,139,160,260,223,32,81,177,33,178,185,90,292,9,232,209,265,10,88,283,147,123,99,261,240,6,138,274,122,61,203,249,155,256,44,294,116,35