** Next:** Structure: struct cubic_grid
** Up:** GRASP Routines: Template Bank
** Previous:** Function: match_cubic()
** Contents**

##

Example: `match_fit` program

This program will try to find the fit to the match function
about some template. It is called with four arguments: the
mass of body 1 (in solar masses), the mass of body 2 (in
solar masses), the value of the match for which it tries
to fit, and (twice) the order of the post-Newtonian expansion
used to compute the templates. For example,
`match_fit 1.2 1.8 .98 4` will try to find a fit to
the .98 match contour near the template for the
using post-2-Newtonian templates.

The program first attempts to find a parabolic fit; if it
is unable to do so, it then tries a cubic. If the cubic
fails, you are in a region of parameter space where the match
is badly behaved. This is typically the case if you ask for
masses that are too large--for example, no fit can be found
near a
solar mass binary with the
LIGO 40-meter prototype noise curve. When the masses are large,
the system radiates very few gravitational-wave cycles in the
instrument's frequency band; and, those cycles typically correspond
to a strongly relativistic regime of inspiral. If you find
yourself in this circumstance, either give up on the large
mass binaries, or try to find a fit at a match level closer to
1.

Includes/match_fit.tex

- Author: Scott Hughes, hughes@tapir.caltech.edu

** Next:** Structure: struct cubic_grid
** Up:** GRASP Routines: Template Bank
** Previous:** Function: match_cubic()
** Contents**
Bruce Allen
2000-11-19