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From: pls@sortac.UUCP (Pat Sullivan)
Newsgroups: comp.text
Subject: Re: Register in troff
Message-ID: <175@sortac.UUCP>
Date: Fri, 31-Jul-87 07:27:05 EDT
Article-I.D.: sortac.175
Posted: Fri Jul 31 07:27:05 1987
Date-Received: Sat, 1-Aug-87 22:20:18 EDT
References: <2730@crcge1.UUCP>
Reply-To: pls@sortac.UUCP (Pat Sullivan)
Organization: AT&T Southern Region, Atlanta
Lines: 17
Keywords: .nr

In article <2730@crcge1.UUCP> gobbi@crcge1.UUCP writes:
>	.nr xx nn	
>	means :
>	the register xx takes the value nn (everybody knows...)
>	But what means :
>	.nr xx n1 n2

Actually, in ".nr xx nn", nn may be signed, in which case register xx
is incremented or decremented by nn.

In ".nr xx n1 n2", xx takes the value n1, and xx's auto-increment value
is set to n2.  After this form of .nr, "\n+(xx" would be interpreted as
the value of xx after incrementing xx by n2; "\n-(xx" would likewise be
interpreted as the value of xx after decrementing xx by n2.

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Pat Sullivan - {akgua|ihnp4}!sortac!pls - voice 404-257-7382