How to write a code to calculate the f '(3)?

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yang-En Hsiao
yang-En Hsiao 2019-10-13
回答： darova 2019-10-13
If f(x)=,then i want to know what is the value after i differential it and replace x with 3
I mean first i calculate f ' (x)=,then now i replace x with 3= f ' (3)== -5.4783
how do i write a code to calculate to the -5.4783?
I know i can use diff() to calculate the f ' (x),but how do i calculate the f ' (3) directly?

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回答（1 个）

darova
darova 2019-10-13
Try symbolic expression
syms f(x)
f(x) = x^2;
f1 = diff(f);
f1(5)

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