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Number registers can also be auto-incremented and auto-decremented. The
increment or decrement value can be specified with a third argument to
the nr
request or \R
escape.
Set number register ident to value; the increment for
auto-incrementing is set to incr. Note that the \R
escape
doesn’t support this notation.
To activate auto-incrementing, the escape \n
has a special syntax
form.
Before interpolating, increment or decrement ident (one-character
name i, two-character name id) by the auto-increment
value as specified with the nr
request (or the \R
escape).
If no auto-increment value has been specified, these syntax forms are
identical to \n
.
For example,
.nr a 0 1 .nr xx 0 5 .nr foo 0 -2 \n+a, \n+a, \n+a, \n+a, \n+a .br \n-(xx, \n-(xx, \n-(xx, \n-(xx, \n-(xx .br \n+[foo], \n+[foo], \n+[foo], \n+[foo], \n+[foo]
produces
1, 2, 3, 4, 5 -5, -10, -15, -20, -25 -2, -4, -6, -8, -10
To change the increment value without changing the value of a register (a in the example), the following can be used:
.nr a \na 10