回答編集履歴
6
Update
test
CHANGED
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@@ -28,7 +28,7 @@
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> colnames(df)[apply(df,
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> colnames(df)[sapply(df, function(c){all(c(1, 2, 9) %in% c)})]
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[1] "X3" "X9" "X10"
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@@ -37,61 +37,3 @@
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~~`which` を使うと良いかもしれません。~~
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-
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```r
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> mat <- matrix(sample.int(15, 100, TRUE), 10, 10)
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[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
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[1,] 3 2 7 9 1 3 3 12 5 13
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[2,] 13 12 13 10 3 8 4 3 10 9
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[3,] 8 11 12 14 2 5 11 8 2 9
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[4,] 7 11 14 13 2 14 13 8 13 10
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[5,] 4 10 7 3 3 2 1 6 4 14
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[6,] 9 2 8 15 12 12 6 9 8 6
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[7,] 9 1 9 11 1 12 4 4 10 7
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[8,] 10 10 8 5 1 2 10 6 7 4
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[9,] 10 5 12 15 8 15 1 13 10 14
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[10,] 13 11 4 10 10 7 10 7 6 1
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> which(mat==4, mat)
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row col
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[1,] 10 2
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[2,] 4 3
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[3,] 2 5
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[4,] 8 6
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[5,] 9 6
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[6,] 4 7
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[7,] 9 7
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[8,] 6 8
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[9,] 6 10
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> unique(which(mat==4, mat)[, 'col'])
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[1] 2 3 5 6 7 8 10
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```
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5
Update
test
CHANGED
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@@ -1,6 +1,6 @@
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1
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```r
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> df <- data.frame(replicate(10,sample(
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> df <- data.frame(replicate(10,sample(1:10,10,rep=TRUE)))
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> df
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> colnames(df)[apply(df, 2, function(c){
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> colnames(df)[apply(df, 2, function(c){all(c(1, 2, 9) %in% c)})]
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[1] "X3" "X9" "X10"
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4
Update
test
CHANGED
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@@ -1,4 +1,42 @@
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1
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```r
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> df <- data.frame(replicate(10,sample(0:10,10,rep=TRUE)))
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> df
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X1 X2 X3 X4 X5 X6 X7 X8 X9 X10
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1 3 5 3 10 7 4 2 8 1 2
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2 6 9 8 8 8 4 7 1 10 1
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3 10 1 4 5 9 5 10 7 9 9
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4 2 5 4 6 6 0 0 6 4 1
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5 3 10 2 8 4 2 2 4 4 1
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6 0 10 3 4 10 3 8 2 4 10
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7 9 8 9 7 6 3 1 4 4 3
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8 2 5 9 10 6 7 4 10 8 5
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9 6 10 10 8 3 5 4 1 8 10
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10 7 4 1 6 9 8 0 2 2 6
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> colnames(df)[apply(df, 2, function(c){ all(c(1, 2, 9) %in% c)})]
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[1] "X3" "X9" "X10"
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```
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1
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-
`which` を使うと良いかもしれません。
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39
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+
~~`which` を使うと良いかもしれません。~~
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2
40
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3
41
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```r
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4
42
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3
Update
test
CHANGED
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@@ -50,4 +50,10 @@
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50
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[9,] 6 10
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> unique(which(mat==4, mat)[, 'col'])
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[1] 2 3 5 6 7 8 10
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```
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2
Update
test
CHANGED
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@@ -1,10 +1,8 @@
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1
1
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`which` を使うと良いかもしれません。
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2
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-
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3
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-
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4
2
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5
3
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```r
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6
4
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7
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> matrix(sample.int(15, 100, TRUE), 10, 10)
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5
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> mat <- matrix(sample.int(15, 100, TRUE), 10, 10)
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8
6
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9
7
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[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
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10
8
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@@ -28,7 +26,7 @@
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[10,] 13 11 4 10 10 7 10 7 6 1
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-
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> which(mat==4, mat)
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1
Update
test
CHANGED
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@@ -1,3 +1,7 @@
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1
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`which` を使うと良いかもしれません。
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2
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3
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4
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1
5
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```r
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2
6
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3
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> matrix(sample.int(15, 100, TRUE), 10, 10)
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