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[kmrcl.git] / math.lisp

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+;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name:          math.lisp
+;;;; Purpose:       General purpose math functions
+;;;; Programmer:    Kevin M. Rosenberg
+;;;; Date Started:  Nov 2002
+;;;;
+;;;; $Id: math.lisp,v 1.1 2002/11/08 06:43:34 kevin Exp $
+;;;;
+;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
+;;;;
+;;;; KMRCL users are granted the rights to distribute and use this software
+;;;; as governed by the terms of the Lisp Lesser GNU Public License
+;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
+;;;; *************************************************************************
+
+
+(in-package :kmrcl)
+(declaim (optimize (speed 3) (safety 1) (compilation-speed 0) (debug 3)))
+
+(defun deriv (f dx)
+  #'(lambda (x)
+      (/ (- (funcall f (+ x dx)) (funcall f x))
+        dx)))
+
+(defun sin^ (x)
+    (funcall (deriv #'sin 1d-8) x))
+
+;;; (sin^ pi)