How to write a code to calculate the f '(3)?
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If f(x)=
,then i want to know what is the value after i differential it and replace x with 3
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/242398/image.png)
I mean first i calculate f ' (x)=
,then now i replace x with 3= f ' (3)=
= -5.4783
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/242399/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/242400/image.png)
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?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/242401/image.png)
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Respuestas (1)
darova
el 13 de Oct. de 2019
Try symbolic expression
syms f(x)
f(x) = x^2;
f1 = diff(f);
f1(5)
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