Get ppm indexes

get_idx() finds which ppm elements are within certain bounds provided in the argument 'r'.

get_idx(r, p)

Arguments

r	the lower and upper bounds of the ppm region you wish to find the indexes of
p	the ppm variable you want to find the indexes of

Value

An array containing the indexes between the lower and upper bounds

Details

The ppm variable matched to a spectrum indicates at what frequency the peak resides. To look at x values between certain frequencies, ask get_idx() to find what columns of x are between the frequency values. For instance, to find the values of creatinine (which resides between ppm 3 and 3.1) in your x variable, input 3 and 3.1 into get_idx() and provide the ppm variable p. From there, get_idx() asks what ppm values are both above the lower ppm of 3 and below the upper ppm of 3.1. These ppm values are then returned as the output of get_idx().

See also

Other estimation: alter8r(), citra(), crea(), noi_(), roundr(), shift_pickr(), tota()

Author

Torben Kimhofer torben.kimhofer@murdoch.edu.au

Kyle Bario kylebario1@gmail.com

Examples

data(p)
idx <- get_idx(r = c(3,3.1), p)