From mboxrd@z Thu Jan  1 00:00:00 1970
From: Brian Gough <bjg@network-theory.co.uk>
To: Kai Trukenmueller <trukenm@ag2.mechanik.tu-darmstadt.de>
Cc: gsl-discuss@sources.redhat.com
Subject: Re: gsl_multifit
Date: Wed, 19 Dec 2001 13:20:00 -0000
Message-id: <15311.12351.959808.416806@debian>
References: <4DFD94A38EB3104E838576A77AEBB36E166DC2@hermes.mathcore.se> <20011018182055.A2874@abb121.ram1st.wh.tu-darmstadt.de>
X-SW-Source: 2001/msg00618.html

Kai Trukenmueller writes:
 > Thanks for the tip. It's much faster now, but still slower than octave.
 > 
 > Order:	(300,200)  (600,400)  (900,600)  (1200,1000)  (1500,1200)
 > Octave:  0.340s     3.320s     11.580s    1m9.680s    2m1.090s
 > gsl(QR): 0.390s     4.560s     22.690s    1m38.640s   5m1.580s

For extra speed try recompiling the library with -DGSL_RANGE_CHECK_OFF=1.
Range checking is currently enabled by default, for safety, and puts an
overhead on every matrix/vector operation.