Numerical derivative in matlab

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dont panic
dont panic 2013-9-26
回答： Tamas Kis 2021-4-14
Hello,
I'm using Matlab 2012 and would need the numerical derivative of a function. What is the Malab command for that ?
Thank you in advance

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-9-26
If you have a series of data
t=[0 1 2 3 4 5] % Vector time
y=[1 2 4 8 12 13] % Your signal
% The derivative can be approximated :
diff(y)./diff(t)
%You can also use symbolic derivative
syms t y
y=cos(t)
dy=diff(y)

更多回答（2 个）

Rohit Garud
Rohit Garud 2020-8-16
编辑：Rohit Garud 2020-8-16
You can use the gradient() function in newer versions of matlab
dy_by_dt = gradient(y(:)) ./ gradient(t(:))
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Daphne PARLIARI
Daphne PARLIARI 2021-1-6
Oh I got confused... What would be the solution to that?
Walter Roberson
Walter Roberson 2021-1-6
for k = 2:length(percent_change)
text(x(k),y(k),sprintf('%0.1f%%',percent_change(k)),...
'HorizontalAlignment','center',...
'VerticalAlignment','bottom')
end

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Tamas Kis
Tamas Kis 2021-4-14
https://www.mathworks.com/matlabcentral/fileexchange/89719-numerical-differentiation-differentiate
Function that can differentiate a set of points given as vectors (such as how you would use cumtrapz to integrate), or differentiate a function defined using a function handle. It can differentiate at any specified point(s) or over an entire domain. Also is of slightly higher accuracy than using diff(y)./diff(t) because it uses central approximation at the interior nodes.

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