Module diferencial

Localiza a posicao de dado ponto a partir de dois adjacentes.

argumentos: func --- funcao ou tabela de entrada xx --- tabela de entrada n --- numero de pontos da tabela x --- valor de x que se deseja determinar y j --- posicao de saida

Fornece a derivada de y em relacao a x.
argumentos:  func --- funcao a ser integrada
             x    --- dlog10 m ou z
             h    --- passo para a diferencicao
             err  --- parametro interno de erro da function

__status__

    This file is part of pystar.
    copyright : Eduardo dos Santos Pereira
    31 mar. 2011.

    pystar is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License.
    pystar is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Foobar.  If not, see <http://www.gnu.org/licenses/>.

Fornce as funcoes locate(xx,n,x), dfridr(func,x,h,err) e
int_simples(func,a,b,dx =0.001)

Value:

'Stable'