[英]How to find the row number of a matrix when its two columns match the given values in r
我有一個 4X5 矩陣示例：
a = 1 2 3 4 5
2 3 3 4 1
5 6 77 8 9
10 9 3 4 17
在這里，我想知道a[,3] == 3和a[,4] == 4的行號。 我想得到的答案是 1,2 和 4 How do I get it in r
用這個
a = matrix(c(1,2,3,4,5,2,3,3,4,1,5,6,77,8,9,10,9,3,4,17), byrow = T, ncol = 5)
which(a[, 3] == 3 & a[ ,4] == 4)
[1] 1 2 4
如何找到包含大於或等於給定數字的值的 R 矩陣的列數？
[英]How to find the number of columns of an R matrix that contains values greater than or equal to a given number?
如何在 R 中找到一列的最高編號並打印該行的兩列？
[英]How to find the highest number of a column and print two columns of that row in R?
如何在R的兩列中找到多個值的組合（而不是排列）？
[英]How to find a number of combinations (not permutations) of values in two columns in R?
如何計算 R 中任意兩個給定值連續出現的次數？
[英]How do I count the number of times any two given values occur together in a row in R?
如何重新排列數據框中的兩列，以便 R 中的行值匹配？
[英]How do I rearrange two columns in a dataframe so that row values match in R?
R-給定一行，計算在其自己的時間戳記的30秒內有多少其他行具有相同的兩個列值和一個時間戳記
[英]R - Given a row, count how many other rows have same two column values and a timestamp within 30 seconds of its own timestamp
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