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matlab中极限的使用——Limit variable must be a symbolic variable.

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晨曦
晨曦 2023-12-7
编辑： Arka 2023-12-27
syms I1 I2 I3 Q1 Q2 Q3
limit(acos((I2-I1)*(I3-I2)+(Q2-Q1)*(Q3-Q2)/(sqrt((I2-I1)^2+(Q2-Q1)^2)*sqrt((I3-I2)^2+(Q3-Q2)^2)))/(sqrt(I3-I1)^2+(Q3-Q1)^2),(sqrt(I3-I1)^2+(Q3-Q1)^2),inf)

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回答（1 个）

Arka
Arka 2023-12-26
编辑：Arka 2023-12-27
Hi @晨曦,
You can go through the standard usage of the "limit" function from the MathWorks documentation link below:
https://www.mathworks.com/help/symbolic/limits.html
As can be seen from the link above, you need to calculate the limit of a function with respect to a symbolic variable. In your case, it is a symbolic expression, and not a symbolic variable.
Hope this helps!
  1 个评论
Dyuman Joshi
Dyuman Joshi 2023-12-26
编辑：Dyuman Joshi 2023-12-26
OP already knows about limit, as they have used it in the code posted above.
Your answer does not add any extra info to this thread.
And it's not a function, but a symbolic expression.

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