Jacobian of Coordinate Change | Error using sym/jacobian (line 44) Second argument must be a vector of variables.

Question

Daniel Pusicha 2022-3-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1663029-jacobian-of-coordinate-change-error-using-sym-jacobian-line-44-second-argument-must-be-a-vector

回答： Daniel Pusicha 2022-3-8

采纳的回答： Daniel Pusicha

Hello everyone,

My goal is to compute the jacobian

of a symbolic vector-valued function

, however I get the error message:

Error using sym/jacobian (line 44)

Second argument must be a vector of variables.

The same error message appears when I try to execute the code from the example 'Jacobian of Coordinate Change' from the help page. By the way, inserting the 'Copy Comand' in my Matlab command line (currently I use MATLAB 2021a) also gives an error message:

>> openExample('symbolic/JacobianOfCoordinateChangeExample')

Error using findExample (line 35)

Example "JacobianOfCoordinateChangeExample" not found in "/Applications/MATLAB_R2021a.app/examples/symbolic/examples.xml".

I also found this post where it is suggested to use symbolic variables instead of symbolic functions but I think that is explicitly what I want to do?

UPDATE 1: I also checked this on an MATLAB 2020b release and the problems exist there as well however running the example in MATLAB Online works as it should. So maybe this is a new feature of the MATLAB 2021b release, however I couldn't find anything that indicates toward this in the release notes.

UPDATE 2: I just installed MATLAB 2021b on my local machine and it works 😄

Best,

Daniel