ftp.nice.ch/pub/next/unix/audio/cmusic.bs.N.tar.gz#/src/lib/libran/logist.c

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#include <math.h>

double logist(rfun, alpha, beta)
	double (*rfun)();
	double alpha, beta;
{
	register double rtn, x; 

	rtn = (-beta - log(1.0/(*rfun)(0.0,1.0) - 1.0)) / alpha;

	return(rtn);
	}

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