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MATLAB PCode Warning on R2021a

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Danny Gho
Danny Gho 2022-9-10
评论： Kiran Kintali 2023-5-4
I am running MATLAB r2021a and I got this warning
Warning: P-file /home1/apps/matlab/2021a/toolbox/matlab/datatypes/isprop.p is older than MATLAB file /home1/apps/matlab/2021a/toolbox/matlab/datatypes/isprop.m.
/home1/apps/matlab/2021a/toolbox/matlab/datatypes/isprop.p may be obsolete and may need to be regenerated.
I understand that this mean that I need to regenerate the P-Code, but considering this is from matlab default toolbox, is there any way I can 'reset' my installation? Keep in mind that my matlab install is managed so I prefer something that can be done in the command line.
Thank you very much for your attention.

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Jan
Jan 2022-9-10
编辑：Jan 2022-9-10
This can happen only, if somebody has edited the file isprop.m . Modifying Matlab's built-in functions is not useful and this cannot happen, if you work without admin privileges.
"I understand that this mean that I need to regenerate the P-Code." - no, don't do this. Usually the M-files of the toolbox functions contain the help section only. If you P-code them and overwrite the original P-file, the Matlab installation is damaged and need a repair e.g. by a re-installation.
The solution is to restore the original version of isprop.m from a backup or to re-install Matlab. Afterwards do not work with admin privilegs such that you cannot change the toolbox functions by accident.
  2 个评论
Tim King
Tim King 2023-5-3
I get this same error with a brand new fresh install. So is it important or can I ignore it?
Warning: P-file C:\Xilinx\Model_Composer\2022.2\simulink\hdl\xlscale_init.p is older than MATLAB file
C:\Xilinx\Model_Composer\2022.2\simulink\hdl\xlscale_init.m.
C:\Xilinx\Model_Composer\2022.2\simulink\hdl\xlscale_init.p may be obsolete and may need to be regenerated.

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更多回答（1 个）

Walter Roberson
Walter Roberson 2022-9-10
I can tell from the path that you are using Linux. For Linux or MacOS, you can use the system utility touch utility to change the modification date associated with a file; see https://man7.org/linux/man-pages/man1/touch.1.html

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