error using the g2s (grad2surf) function on R2024a

Question

noam ginio 2024-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/2116637-error-using-the-g2s-grad2surf-function-on-r2024a

评论： noam ginio 2024-5-11

Hello all,

I have used the functions alot on version R2021b and they ran perfect.

When i tried to run it on R2024a and got an error regarding the lyap function (the function g2s calls for g2sSylvester which calls for "lyap" function on line 100).

Just to verify, I ran it again with same variables on the older version and the error disappeared.

Any idea what is causing this and how it can be solved?

As i am using the new DL functions of the later version i would like to keep using the later version

BR

Noam

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Pooja Kumari 2024-5-8

Can you share the screenshot of exact error you are getting?

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Answer 1

John D'Errico 2024-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/2116637-error-using-the-g2s-grad2surf-function-on-r2024a#answer_1454622

移动：John D'Errico 2024-5-8

在 MATLAB Online 中打开

Odds are, you don't have lyap on that installation.

which lyap -all
/MATLAB/toolbox/control/control/lyap.m

It is part of the control toolbox. So if you had a license for that TB on the old installation, but not on the 2024a installation, it would fail. We need to see the error message you got to be more sure.

You can check though. Use the command

ver

on those systems, and I expect you will see one has the control TB and the other lacks it.