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

Well, without much prospect of v.6 of Maxima in the near future, it is 
tempting to do the following:

MAXIMA_VERSION:map(parse_string, tokens(?\*autoconf\-version\*, 'digitcharp));
MAXIMA_VERSION_NUM:float(MAXIMA_VERSION[2]+MAXIMA_VERSION[3]/10),

... in any case I'd love to have some way of knowing the runtime version 
of Maxima which is stable over future versions inside the Maxima core!

Thanks for this tip,
Chris



On Wed, 16 Sep 2009, Leo Butler wrote:

>
>
> On Wed, 16 Sep 2009, Alexander Shulgin wrote:
>
> < On Fri, Sep 4, 2009 at 13:20, Andrej Vodopivec
> < <andrej.vodopivec at gmail.com> wrote:
> < > Lisp variable *autoconf-version* contains the version as a string. You
> < > can then use stringproc functions to compare versions.
> < >
> < > (%i1) version: ?\*autoconf\-version\*;
> < > (%o1) 5.19.2
> <
> < Thanks, this worked! :)
> <
> < I've come up with the following:
> <
> < maxima_version() :=
> <   map(parse_string, tokens(?\*autoconf\-version\*, 'digitcharp));
> <
> < version_compare(v1, v2) := block(
> <   [len1: length(v1), len2: length(v2), v, i, cmp: 0],
> <   if len2 > len1 then v1: append(v1, makelist(0, i, 1, len2 - len1)),
> <   if len1 > len2 then v2: append(v2, makelist(0, i, 1, len1 - len2)),
> <   v: v1 - v2,
> <   i: 1,
> <   while i <= length(v) and cmp = 0 do
> <     (cmp: v[i],
> <      i: i + 1),
> <   cmp);
>
> I notice that stringproc has imported the lisp character comparison
> functions, but only the string= function. As a result, you have written
> lots of code to overcome this. Here is an alternative,
>
>
> slessp(s1,s2):=if stringp(s1) and stringp(s2) then ?string\<(s1,s2) else
> error("...");
>
> vc(v):= if stringp(v) then if slessp(?\*autoconf\-version\*,v)#false then 1 elseif
> slessp(v,?\*autoconf\-version\*)#false then -1 else 0 else error("...");
>
> The first function imports lisp's string< to maxima, and the second does
> the comparison you want.
>
> (%i15) vc("5.18.1");
>
> (%o15) 0
> (%i16) vc("5.18.0");
>
> (%o16) -1
> (%i17) vc("5.19.1");
>
> (%o17) 1
>
>
>
> -- 
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> Scotland, with registration number SC005336.
>
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