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Bill Allombert on Fri, 24 Nov 2023 09:21:33 +0100
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- To: pari-users@pari.math.u-bordeaux.fr
- Subject: Re: Lookup Table
- From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
- Date: Fri, 24 Nov 2023 09:21:07 +0100
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On Thu, Nov 23, 2023 at 11:16:35PM -0800, Thomas D. Dean wrote:
> I want to create a sparse lookup table with a key and value or key and set.
> When I do table[N], or a function call, I want to get back either 1 or 0.
> Another use, I want to return a set, {1,2,3,...} or {}.
>
> For example, I want table[N] to return 0 if entry N exists or 1 if it does
> not.
>
> I tried
> ? M=Map();
> %131 = Map([;])
> ? mapput(~M,7,0)
> ? mapget(M,7)
> %133 = 0
>
> Does mapget(M,7) use pass by value or is M passed by reference?
It is semantically passed by value, but it is not copied.
> ? mapget(M,8)
> *** at top-level: mapget(M,8)
> *** ^-----------
> *** mapget: nonexistent component in mapget: index not in map
>
> Is it possible to do this?
Use mapisdefined(M,8)
Cheers,
Bill.