Syntax of integer lists


Integer lists are used in a wide variety of contexts, e.g. in the preprocessor repeat directive. This web page documents the syntax of integer lists.

Note: in some contexts elements of the list are real numbers, not integers. The syntax is the same for real numbers.

Integer lists consist of a sequence of strings separated by commas:


Each of the   strn1, strn2, …   can assume one of the following three forms:

  1. a single integer or algebraic expression

  2. two integer expressions separated by a colon, viz


    gets expanded into

    low, low+1, low+2, ... high
  3. Three integer expressions separated by colons, viz


    gets expanded into:

    low, low+step, low+2*step, ... high
  4. (Extension, applicable only in some contexts). The dup tag:


    duplicates the entire list to this point, and # is added to the duplicate elements. Thus the list doubles in size.


  5+1         	becomes a single number, 6.
  5+1:8+2     	becomes a sequence of numbers, 6 7 8 9 10
  5+1:8+2:2   	becomes a sequence of numbers, 6 8 10
  1:4,7:11    	becomes the sequence 1 2 3 4  7 8 9 10 11

  5,6,8,dup=16  becomes 5 6 8  21 22 24  (where applicable)

Note:  slatsm/mkilst.f contains the source code for generating integer lists.

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