x=[0 0 0 400 400 400 800 800 800 1200 1200 1200 1600 1600 1600];y=[1 1 1 .669165 .676168 .691259 .720724 .766052 .647044 .674313 .689165 .772529 .706594 .567078 .734642];y=exp(-x/A(1))求高手编程拟合指数函数,程序和结果表达式,多谢
最小二乘
function A=funtestxxf(x,y)x=x(:);y=log(y(:));A=(x.'*x)^-1*(x.'*y);A=-1/A;end
麻烦你把整个命令和画图命令都给我吧,初学,你这么写我不是太懂