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Bill Allombert on Wed, 17 Jan 2024 11:31:43 +0100
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Re: Bizarre semantic of Mat
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- To: pari-dev@pari.math.u-bordeaux.fr
- Subject: Re: Bizarre semantic of Mat
- From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
- Date: Wed, 17 Jan 2024 11:31:39 +0100
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On Tue, Jan 16, 2024 at 06:36:52PM -0800, Ilya Zakharevich wrote:
> Today I (finally) looked through the documentation of Mat() — and it
> seems to be very convenient for interactive usage! On the other hand,
> such “cute” semantics have a tendency to become a limiting factor when
> one wants to write down general-purpose algorithms…
>
> Is there a simple way to convert a vector-column into a 1 column
> matrix (without using matrix())? Mat() is almost there — except for
> bizarre special-cases — which are impossible to switch off!
There is a trick:
? V=[[1]~,[2]~,[3]~]
%28 = [[1]~,[2]~,[3]~]
? Mat(V~)~
%29 = Mat([[1]~,[2]~,[3]~])
? V=[[1],[2],[3]]~
%30 = [[1],[2],[3]]~
? Mat(V~)~
%31 = [[1];[2];[3]]
Cheers,
Bill