version 0.2.3 (positive)

This version of prospectris now available on CRAN

New features

• The kenStone function now includes a new feature that allows to initialize the
  calibration sample search with a user-defined subset of observations (which are
  to be included in the final calibration subset). Thanks to Thorsten Behrens and
  Philipp Baumann for suggesting this feature.

• The gap-segment derivatives (gapDer) function now allows for high order
  derivatives. In previous versions the function only allowed up to derivatives of
  4th order, in this version the the function accepts as derivative order
  any integer larger than 1.

Improvements and fixes

• binning() a bug in the creation of the binning groups has been fixed. This bug
  is in fact inherited from a problem in the findInterval() function. The breaks
  (given in the vec arument) might get corrupted when they contain many decimal
  places. These breaks (in vec) are used to define the final bins. The problem in
  the binning function was that when a frequency
  variable (e.g. wavelength) was exactly on the left of the bin
  range the variable was assigned to the next bin. In some cases this lead to
  small discrepancies in the in the computation of the mean of the bins.

• spliceCorrection() now accepts one or two values as input for the splice
  argument. Previously it only accepted a vector of length two. For example, now it
  corrrects for splice steps of spectra that originates from spectrometers
  with two detectors (i.e. it corrects for the potential abrupt transition
  betwteen the two detectors).

• An extra sanity check has been added to the read_nircal() function. The
  function evaluaes whether it is indeed a file properly produced by the BUCHI
  nircal software.

• There was a bug in the filter for the 3rd order derivative in gap segment
  derivative (gapDer) function. One of the factors in the filter had a wrong
  negative sign.

• There was a bug in the read_nircal function. It emerged only in some files and
  prevented the function from reading the Description field properly

Changes

• In the msc() function the argument reference_spc has been renamed to
  ref_spectrum to emphasize that its input must be is a vector and not a
  matrix of spectra.