用matlab求函数在指定点的数值导数f(x)=根号(x^2+1)x=1,2,3

Question

用matlab求函数在指定点的数值导数
f(x)=根号(x^2+1) x=1,2,3

Answer 1

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