gsll-devel October 2008

gsll-devel@common-lisp.net

3 participants
2 discussions

[Gsll-devel] closure out of letm
by Tamas K Papp 03 Oct '08

03 Oct '08

Hi, I am trying to create a function that would return another function that generates draws from a beta distribution. Something like this: (defun make-beta-generator (a b) (letm ((rng (random-number-generator *mt19937* 0))) (lambda () ;; of course this won't work, letm deallocated rng (beta-rd rng a b)))) As the comment says, this does not work. Is there a way to prevent letm from deallocating rng (or achieve the effect I want by some other means)? Thanks, Tamas

2 3

[Gsll-devel] Using the numerical differentiation functions
by Zach 03 Oct '08

03 Oct '08

Hey Liam et al. I wanted to use the numerical differentiation functions of GSL (specifically gsl_deriv_central or the GSLL equiv CENTRAL-DERIVATIVE). Does anyone have some examples of it's usage? i have tried this with my home brewed GSL bindings. However, it is a bit trickier than most stuff I have played with since it involves a callback function. The callback must be placed in a slot of a gsl_function object. Both of these steps seem trivial enough, but I am getting some memory error that I am having trouble debugging (bringing back old nightmares of C). Anyway, thanks for reading, Zach

2 1

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

gsll-devel October 2008