sample
置換を有する標本化
呼び出し手順
s = sample(n, X, orient)
パラメータ
- n
正の整数 (標本の大きさ)
- X
任意のデータ型の配列、またはセル配列. この配列からサンプルが抽出されます.
- orient
The shape of samples:
'*'(default): elements ofXare sampled.1or'r': rows ofXare sampled.2or'c': rolumns ofXare sampled.
- s
同じタイプのサンプルを含むベクトル、行列、またはセル配列
Xとして.
説明
s = sample(n, X)
(or s = sample(n, X, '*'))
returns a vector s of n elements randomly chosen
among X elements, with replacement.
s = sample(n, X, 'r')
(or s = sample(n, X, 1))
returns a matrix of size n x size(X,'c') of randomly chosen Rows
of X, with replacement.
s = sample(n, X, 'c')
(or s = sample(n, X, 2))
returns a matrix of size size(X,'r') x n of randomly chosen Columns
of X, with replacement.
例
Sampling some numbers:
data = (1:9)' * 10.^(-3:3) sample(8, data) sample(5, data, "r") sample(5, data, "c")
--> data = (1:9)' * 10.^(-3:3) data = 0.001 0.01 0.1 1. 10. 100. 1000. 0.002 0.02 0.2 2. 20. 200. 2000. 0.003 0.03 0.3 3. 30. 300. 3000. 0.004 0.04 0.4 4. 40. 400. 4000. 0.005 0.05 0.5 5. 50. 500. 5000. 0.006 0.06 0.6 6. 60. 600. 6000. 0.007 0.07 0.7 7. 70. 700. 7000. 0.008 0.08 0.8 8. 80. 800. 8000. 0.009 0.09 0.9 9. 90. 900. 9000. --> sample(8, data) ans = 0.02 0.06 10. 0.009 0.007 70. 6000. 60. --> sample(5, data, "r") ans = 0.002 0.02 0.2 2. 20. 200. 2000. 0.009 0.09 0.9 9. 90. 900. 9000. 0.005 0.05 0.5 5. 50. 500. 5000. 0.002 0.02 0.2 2. 20. 200. 2000. 0.004 0.04 0.4 4. 40. 400. 4000. --> sample(5, data, "c") ans = 10. 0.1 100. 0.1 0.001 20. 0.2 200. 0.2 0.002 30. 0.3 300. 0.3 0.003 40. 0.4 400. 0.4 0.004 50. 0.5 500. 0.5 0.005 60. 0.6 600. 0.6 0.006 70. 0.7 700. 0.7 0.007 80. 0.8 800. 0.8 0.008 90. 0.9 900. 0.9 0.009
Sampling some texts:
data = [ "a" "aa" "aaa" "aaaa" "aaaaa" "aaaaaa" "b" "bb" "bbb" "bbbb" "bbbbb" "bbbbbb" "c" "cc" "ccc" "cccc" "ccccc" "cccccc" "d" "dd" "ddd" "dddd" "ddddd" "dddddd" "e" "ee" "eee" "eeee" "eeeee" "eeeeee" "f" "ff" "fff" "ffff" "fffff" "ffffff" ]; sample(5, data) sample(4, data, "r") sample(4, data, "c")
--> sample(5, data) ans = "ffff" "bb" "aaaa" "d" "c" --> sample(4, data, "r") ans = "d" "dd" "ddd" "dddd" "ddddd" "dddddd" "f" "ff" "fff" "ffff" "fffff" "ffffff" "d" "dd" "ddd" "dddd" "ddddd" "dddddd" "b" "bb" "bbb" "bbbb" "bbbbb" "bbbbbb" --> sample(4, data, "c") ans = "aaaaaa" "a" "aaa" "a" "bbbbbb" "b" "bbb" "b" "cccccc" "c" "ccc" "c" "dddddd" "d" "ddd" "d" "eeeeee" "e" "eee" "e" "ffffff" "f" "fff" "f"
Sampling some cells:
data = {%f, %pi, "abc", 1-%z ; 1+%z, "ABC", %e, %f} sample(5, data) sample(3, data, "r") sample(3, data, "c")
--> data = {%f, %pi, "abc", 1-%z ; 1+%z, "ABC", %e, %f}
data =
[1x1 boolean ] [1x1 constant] [1x1 string ] [1x1 polynomial]
[1x1 polynomial] [1x1 string ] [1x1 constant] [1x1 boolean ]
--> sample(5, data)
ans =
[1x1 constant] [1x1 polynomial] [1x1 string] [1x1 string] [1x1 boolean]
--> sample(3, data, "r")
ans =
[1x1 boolean ] [1x1 constant] [1x1 string ] [1x1 polynomial]
[1x1 polynomial] [1x1 string ] [1x1 constant] [1x1 boolean ]
[1x1 polynomial] [1x1 string ] [1x1 constant] [1x1 boolean ]
--> sample(3, data, "c")
ans =
[1x1 polynomial] [1x1 boolean ] [1x1 string ]
[1x1 boolean ] [1x1 polynomial] [1x1 constant]
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