ir_multiply: Multiply infrared spectra or multiply infrared spectra with a...

In henningte/ir: Functions to Handle and Preprocess Infrared Spectra

Multiply infrared spectra or multiply infrared spectra with a numeric value

Description

ir_multiply takes two objects of class ir, x and y, and multiplies their intensity values, or it takes one object of class ir, x, and one numeric value, y, and multiplies all intensity values in x with y.

Usage

ir_multiply(x, y)

Arguments

x	An object of class ir.
y	An object of class ir or a numeic value. If y is an object of class ir, it must have the same number of rows as x and the same x axis values (e.g. wavenumber values) in each matching spectrum as in x.

Value

x where for each spectrum intensity values are multiplied with the respective intensity values in y (if y is an object of class ir), or where all intensity values are multiplied with y if y is a numeric value.

Examples

# multiplication with y as ir object
x1 <-
  ir::ir_multiply(ir::ir_sample_data, ir::ir_sample_data)
x2 <-
  ir::ir_multiply(ir::ir_sample_data, ir::ir_sample_data[1, ])

# multiplication with y being a numeric value
x3 <-
  ir::ir_multiply(ir::ir_sample_data, y = -1)

# multiplication with y being a numeric vector
x4 <-
  ir::ir_multiply(
     ir::ir_sample_data,
     seq(from = 0, to = 2, length.out = nrow(ir::ir_sample_data))
  )

henningte/ir documentation built on July 4, 2025, 5:12 p.m.