[英]How to count number of occurrences of data combinations and save in a matrix in R?
[英]How to count a change of number in a matrix in R?
我有一個名為'cmat'的矩陣:
> cmat
[,1]
[1,] 0
[2,] 0
[3,] 0
[4,] 1
[5,] 0
[6,] 1
[7,] 0
[8,] 1
[9,] 0
[10,] 1
[11,] 1
[12,] 1
[13,] 0
[14,] 0
[15,] 1
[16,] 0
[17,] 1
[18,] 0
[19,] 0
[20,] 1
[21,] 0
[22,] 1
[23,] 0
現在,我想要實現的是我想要計算值從之前的值0變為1的次數。如何在R中執行此操作?
如果只有二進制值, sum(diff(cmat)==1)
可能是一種方法。
你可以做到
sum( cmat[, 1] == 1 & c(NA, head(cmat[, 1], -1)) == 0 , na.rm = TRUE)
在這里添加一個替代方案。 rle(cmat)
將允許您識別值更改的每個位置以及新值。
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