matlab求导(matlab如何计算某点处的导数)

用matlab求函数在指定点的数值导数代码如下 clear; clc; syms x f = sqrt(x^2+1); diff_f = diff(f); y1 = subs(diff_f,x,1) y2 = subs(diff_f,x,2) y3 = subs(diff_f,x,3) 结果 y1 =0.7071 y2 =0.8944 y3 =0.9487