[Maxima] How to find out runtime version of Maxima? (confused by new format of eigenvectors() in 5.19.2)

[Alexander Shulgin]

Hi,

Is it possible to find out which version of Maxima is used at runtime?

I'm asking because the latest version 5.19.2 breaks my program:
eigenvectors now returning a list in different format.  How can I
write code to run on both 5.19.2 and earlier versions?

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Regards,
Alex