Question

I have a vector of x. I would like to create a matrix of pair elements which their difference is less than or equal 1e-2. How can I do this in R?

    x = c(0.0001560653, 0.0001685597, 0.0002793819, 0.0006336307, 0.0455676525,
    0.3184740837, 0.3195122279, 0.3195122606)

    i = which(diff(x) <= 1e-2)

My desired matrix is as follows:

    > M
         [,1]         [,2]
  [1,] 0.0001560653 0.0001685597
  [2,] 0.0001685597 0.0002793819
  [3,] 0.0002793819 0.0006336307
  [4,] 0.3184740837 0.3195122279
  [5,] 0.3195122279 0.3195122606

Answer 1

Like that:

idx <- which(diff(x) <= 0.01)
cbind(x[idx], x[idx+1])
#              [,1]         [,2]
# [1,] 0.0001560653 0.0001685597
# [2,] 0.0001685597 0.0002793819
# [3,] 0.0002793819 0.0006336307
# [4,] 0.3184740837 0.3195122279
# [5,] 0.3195122279 0.3195122606