Re: [Gretl-devel] [Gretl-users] Problem with Add Random Variable menu command
On Thu, 10 Jan 2019, Sven Schreiber wrote:
Am 10.01.2019 um 17:20 schrieb Riccardo (Jack) Lucchetti:
> On Wed, 9 Jan 2019, Artur T. wrote:
>>> Am 09.01.19 um 21:39 schrieb Alecos Papadopoulos:
>>>> I have version 2018d Windows 64-bit.
>>>>
>>>> I try to generate random numbers using the "Random variable..."
command
>>>> in the Add menu and I get
>>>>
>>>> <<'U1' -- no numeric conversion performed!>>
>>
>> I can confirm this using current git (2019a) on ubuntu linux.
>
> This should be now fixed in git.
Good, I tend to think it's a pretty severe bug, for example for teaching
purposes...
[I'm moving this to gretl-devel because it's fairly technical, but IMO
wotrh reading for people who like to see what's going on in the C sources]
In fact, it was pretty subtle: the C construct that was causing trouble
was
na(x[j++])
and you would think: "OK, this evaluates if x[j] is missing, and then
moves on"; not quite. In fact, na(x) has become (after the big NADBL
reoganisation) a macro in which TWO calls are performed, so j would go
straight from 0 to 2. I performed a search for similar construct in the
whole source tree and fortunately there seem to be no more instances.
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Riccardo (Jack) Lucchetti
Dipartimento di Scienze Economiche e Sociali (DiSES)
Università Politecnica delle Marche
(formerly known as Università di Ancona)
r.lucchetti(a)univpm.it
http://www2.econ.univpm.it/servizi/hpp/lucchetti
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