how to differentiate this equation

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areej abdulshaheed 2020-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/508451-how-to-differentiate-this-equation

编辑： KALYAN ACHARJYA 2020-3-2

if I have this equation

theta=-2*alpha*sin(kn*pi/n)*sin(2*kn*pi*s/L+2*kn*pi*(i)/n+kn*pi/n)

how can I differenat theta(s) to theta_D and theta_DD

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Answer 1

KALYAN ACHARJYA 2020-3-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508451-how-to-differentiate-this-equation#answer_418026

编辑：KALYAN ACHARJYA 2020-3-2

在 MATLAB Online 中打开

syms s 
theta_D=diff(theta,s);
theta_2D=diff(theta,s,2); %or theta_2D=diff(theta_D,s);

diff

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areej abdulshaheed 2020-3-2

this erroer occur

Error using diff

Difference order N must be a positive integer scalar.

Error in mohammed (line 43)

theta_D=diff(theta,s)

Walter Roberson 2020-3-2

diff() can only be used to differentiate symbolic expressions or symbolic functions. If you attempt to differentiate a numeric array but pass in a symbolic variable as the second parameter, or pass in anything that is not a scalar integer (such as a vector of numeric values), then you would get that error.

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