How can I get outcome at a particular value after performing differentiation?

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onsagerian
onsagerian 2019-2-15
评论： onsagerian 2019-2-17
Hello,
I would like to know how I can get outcome at a particular value after performing "differentiation" of a function using Matlab code. For example, after obtaining the first derivative of the particular function x^2-2*x+6, substituting x=3 into the derivative, then the outcome will be 4. See the simple program I've constructed, and please let me know how to fix the error.
syms x
f=x^2-2*x+6;
diff(f,x=2)

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采纳的回答

Walter Roberson
Walter Roberson 2019-2-16
subs(diff(f,x),x,2)

更多回答（1 个）

madhan ravi
madhan ravi 2019-2-16
Another option:
dx(x)=diff(f);
dx(3)

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