Ah! I believe the difference between medover and median is a clump(-1) to
collapse the dimensions
There does it indeed to be something wrong with clump too, so that is probably
the underlying cause
pdl> $x = rcols 'tmp.dat'
Reading data into ndarrays of type: [ Double ]
Read in 4 elements.
pdl> p $x
[1 2 3 4]
pdl> $x *= 100
pdl> p $x
[100 200 300 400]
pdl> p $x->clump(-1)
[0 0 0 0]
What could be happening in rcols() that produces an ndarray that behaves like
that?
Karl
> On 7 Jan 2024, at 12:48 pm, Luis Mochan <[email protected]> wrote:
>
> I noticed that medover and maxover do work as expected in this case.
>
>
> On Sun, Jan 07, 2024 at 11:26:56AM +1100, Karl Glazebrook via pdl-general
> wrote:
>> Hi all,
>>
>> This dinosaur just upgraded from PDL v2.025 to v.2.084 (yes, I know that is
>> lame)
>>
>> I noticed a few things when running one of my complicated codes, I will
>> start seperate email threads
>>
>> First there seems to be a serious rcols bug:
>>
>>
>> e.g. create a file
>>
>> # tmp.dat
>> 1
>> 2
>> 3
>> 4
>>
>>
>> Loaded PDL v2.084 (supports bad values)
>> pdl> $x = rcols 'tmp.dat'
>> Reading data into ndarrays of type: [ Double ]
>> Read in 4 elements.
>>
>> pdl> p $x
>> [1 2 3 4]
>> pdl> $x *= 100
>>
>> pdl> p $x
>> [100 200 300 400]
>> pdl> p median($x)
>> 0
>> pdl> p $x
>> [100 200 300 400]
>>
>>
>> It seems the median function sees the values BEFORE the inplace
>> multiplacation, whereas print does not. This is very bad. min() and max()
>> are similar. No idea what is going on here! The behaviour or absent from
>> v2.025
>>
>> Notes
>> - making a $x->copy() removes the effect
>> - creating $x using sequence also removes, so it is something to do with
>> rcols() and not inplace in general?
>>
>> I’d be interested to know if others can reproduce this. It definitely needs
>> a fix
>>
>> best
>>
>> Karl
>>
>>
>>
>
>
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>
>
> --
>
> o
> W. Luis Mochán, | tel:(52)(777)329-1734 /<(*)
> Instituto de Ciencias Físicas, UNAM | fax:(52)(777)317-5388 `>/ /\
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