ephEarthMoonBarycenter405.mat not found error although toolbox is installed

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Gökhan 2024-6-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2125821-ephearthmoonbarycenter405-mat-not-found-error-although-toolbox-is-installed

回答： Gökhan 2024-6-11

Hi

Although I have the Aerospace Blockset, Aerospace Toolbox and Ephemeris Data for Aerospace Toolbox installed; I receive the following error. Is this some kind of path problem? Or is the mat file really missing ?

The error message is:

The ephemeris data file "ephEarthMoonBarycenter405.mat" could not be found. check that the "Ephemeris Data for Aerospace Toolbox" support package is installed.

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Answer 1

Gökhan 2024-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/2125821-ephearthmoonbarycenter405-mat-not-found-error-although-toolbox-is-installed#answer_1470436

I have found the resolution to my earlier problem (I think).

What I realized is the following:

when you write a MATLAB script (*.m file) if you specify some local paths for your own (home made) files/folders, you would use addpath command for example:

addpath("Functions\");

this command however, as I understand, messes up with the built in paths and renders some of original MATLAB built-in paths invalid. That was the reason, when I opened a brand new MATLAB session, the scripts which did not have any "path" commands worked (hence finding the ephemeris file). As soon as I used the "path" command, the existing file could not be found. After some test and trial I found that adding my custom paths to the end of path list by the command:

addpath("Functions\",'-end');

worked fine.