Derivative of symbolic funtion at a specific value

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Ahmed Elkady
Ahmed Elkady 2012-9-22
评论： Mohammad Tauquir Iqbal 2018-7-10
I have a symbolic function of variable "x"
Function = @(x) 8-4.5*(x-sin (x));
say I need to get the derivative at x=5
what should i do?

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Azzi Abdelmalek
Azzi Abdelmalek 2012-9-22
编辑：Azzi Abdelmalek 2012-9-22
Function = @(x) 8-4.5*(x-sin (x));
Function(5)
%derivative
Function_d = @(x) diff('8-4.5*(x-sin (x))');
x=5; eval(Function_d(1))
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Ahmed Elkady
Ahmed Elkady 2012-9-22
Still not working, it gives the derivative as function of "x" but it doesn't evaluate at x=5
>> Function_d = @(x) diff('8-4.5*(x-sin (x))'); >> Function_d(5)
4.5*cos(x) - 4.5
Azzi Abdelmalek
Azzi Abdelmalek 2012-9-22
编辑：Azzi Abdelmalek 2012-9-22
try this
Function_d = @(x) diff('8-4.5*(x-sin (x))');
x=5; eval(Function_d(1))

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更多回答（1 个）

Ahmed Sheta
Ahmed Sheta 2017-4-25
syms x y=sin(x) a=diff(y,2,x) subs(a,x,pi/2)

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