findEqualGreater: Find values in sorted vectors

In sneumann/xcms: LC-MS and GC-MS Data Analysis

Find values in sorted vectors

Description

Find values in sorted vectors.

Usage

findEqualGreater(x, value)
findEqualLess(x, value)
findEqualGreaterM(x, values)
findRange(x, values, NAOK = FALSE)

Arguments

x	numeric vector sorted in increasing order
value	value to find in x
values	numeric values to find in x
NAOK	don't check for NA values in x

Details

findEqualGreater finds the index of the first value in x that is equal or greater than value. findEqualLess does same except that it finds equal or less. findEqualGreaterM creates an index of a vector by finding specified values. findRange locates the start and stop indicides of a range of two x values.

The only things that save time at this point are findeEqualGreaterM (when the length of values approaches the lenght of x) and findRange (when NAOK is set to TRUE). They run in log(N) and N time, respectively.

Value

An integer vector with the position(s) of the values(s).

Author(s)

Colin A. Smith, [e-mail]

sneumann/xcms documentation built on Nov. 23, 2024, 6:53 p.m.