Commands that Change or Create Data

 calculate/vcalculate
Invokes the interpreter for vector arithmetics, with/without the interpolation of y-values. See chapter 9 for details.

 combin
Averages over groups of points or creates a new binning (sec. 15.3.12).

 check/x
Averages points with identical x-values (sec. 15.3.7).

 create/...
Creates GQEs (sec. 15.3.16).

 cursor
Invokes the software cursor (sec. 15.3.17).

 cut/keep
Creates a new SCAN by removing/copying a part of another SCAN (sec. 15.3.18).

 exchange
Exchanges the x- and y-values of a SCAN (sec. 15.3.27).

 fft
Fast Fourier transformation (sec. 15.3.30).

 merge
Puts two SCANs together (sec. 15.3.45).

 smooth
Smoothes a SCAN (sec. 15.3.73).

 sort
Sorts the points of a SCAN with respect to the x-values (sec. 15.3.74).

 type
Types the points of a SCAN/ARRAY on the screen (sec. 15.3.78).

 user
Calls a user-function (VMS). A user-function can be written in any language. It has to be linked as a shared image before SPECTRA is started. An example is given in sec. 15.3.79.