Difficulties with Numerical Recipes Fortran

[Mattheau]

Hi all,<br><br>I am new to the Fortran Forum, and to programming.&nbsp;&nbsp;I have attempted to enter and use the Levenberg-Marquardt non-linear parameter estimation routine, coded from the Numerical Recipes book I purchased, but alas to no avail.&nbsp;&nbsp;I am pretty certain my syntax is good (thoroughly checked), and am uncertain why the program crashes.&nbsp;&nbsp;I would appreciate any help indeed as I would be very interested to have this code up and running.<br><br>Kind regards and thanks,<br><br>Mattheau<br><A HREF="mailto:matt@sspa.com">matt@sspa.com</A>