ftp.nice.ch/pub/next/unix/audio/cmusic.bs.N.tar.gz#/src/cmusic/ug.abs.c

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/* Absolute Value unit generator */

#include "ug.head.h"
#include <math.h>

#define IN 1

Abs

UGHEAD{
    UGINIT;
    UGLOOP{
	VAL(OUT)++ = fabs((double)VAL(IN));
    UGEND(1)
    }
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.