From: "Kevin H. Hobbs" <hobbsk@ohiou.edu>
To: gsl-discuss@sourceware.org
Subject: ODE IV Control and Variable Scale
Date: Thu, 18 Mar 2010 18:28:00 -0000 [thread overview]
Message-ID: <4BA2707F.50105@ohiou.edu> (raw)
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I'm trying make sure that I am using the gsl_odeiv_control functions
correctly.
I'm modelling neurons and my variables have different scales. Voltage is
usually between -100 and 50 mV. The membrane current gating variables
stay between 0 and 1. Internal calcium concentration is usually between
0 and a few hundred micro molar.
Each time I read the descriptions of the gsl_odeiv_control functions I
become more convinced that the parameters eps_rel, a_y, and a_dydt are
there to excuse some error in variables and derivatives that are far
from zero. Is that correct?
Since I have no reason to care more about values close to zero (unless I
do some complicated remapping of the variable values) should I set
eps_rel, a_y, and a_dydt to 0?
Since my variables have different ranges should I use
gsl_odeiv_control_scaled_new with an appropriate eps_abs and scale_abs
set with something like 1 for internal calcium concentration, 0.3 for
membrane voltage, and 0.001 for all of the gating variables?
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next reply other threads:[~2010-03-18 18:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-18 18:28 Kevin H. Hobbs [this message]
2010-03-20 19:18 ` Tuomo Keskitalo
2010-03-22 14:49 ` Kevin H. Hobbs
2010-03-22 17:26 ` Tuomo Keskitalo
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