Ode45的步长以及RelTol AbsTol
look hereThe stepsize of ode45 is not constant, but chosen such that the error tolerances you prescribe are met. Thus mean step size can only be controlled indirectly by strengthening (-> smaller stepsize) or weakening (-> larger stepsi
JSP 制作验证码的实例详解
JSP 制作验证码的实例详解
验证码
验证码(CAPTCHA)是“Completely Automated Public Turing test
正则基础之 神奇的转义
1 概述这或许会是一个让人迷惑,甚至感到混乱的话题,但也正因为如此,才有了讨论的必要。在正则中,一些具有特