源程序：function [u,x,t] = EF_Euler(A,xf,T,it0,bx0,bxf,M,N)解方程 A u_xx = u_t ， 0 <= x <= xf, 0 <= t <= T 初值: u(x,0) = it0(x)边界条件: u(0,t) = bx0(t), u(xf,t) = bxf(t)M ： x 轴的等分段数 N ： t 轴的等分段数 dx = xf/M...