![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/262337/image.png)
How to calculate the derivate of an equation ?
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Hi All
I have the crack energy equation :
![c1.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/262334/c1.png)
In which R and G are numbers , also c and m. N is loading cycle : so it's a signal.
in which rho is defined as :
![c2.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/262335/c2.png)
Having the second equation, how can I derivate it with respect to N numerically ?
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Star Strider
2020년 1월 18일
If ‘N’ is a vector, use gradient on it, then multiply that result by the other term in the
expression.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/262337/image.png)
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Star Strider
2020년 1월 18일
My pleasure!
The MATLAB gradient function calculates the central difference approximation of the numerical derivative. Mathematically, Gradient is a specific term that the gradient function actually creates with a matrix argument. With a vector, the MATLAB gradient function returns the derivative of the vector. See the documentation for a full description of the function and its use.
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