I believe that as Devon said the subarray selected by m in x m} y must not
contain any fill elements, which isn't the case of your example as in its case
the first element of m specifies a length 4 vector while the other two elements
specify length 2 vectors. This leads to a 2 by 2 matrix of fills (spaces)
visible (or not) in m{y.
Another workaround is to manually specify all locations individually (which
isn't too much work):
n=: 5 8$'O'
i=: (<0;0 1 2 3),(<1;2 3),<2 4;5
]j=: ; {&.> i
+---+---+---+---+---+---+---+---+
|0 0|0 1|0 2|0 3|1 2|1 3|2 5|4 5|
+---+---+---+---+---+---+---+---+
'=' j} n
====OOOO
OO==OOOO
OOOOO=OO
OOOOOOOO
OOOOO=OO
Cheers,
Louis
> On 23 Nov 2019, at 20:35, Devon McCormick <[email protected]> wrote:
>
> Not sure why but it seems to have to do with length compatibility of the
> indexes:
>
> '='((<0; 0 1 2 3),(<1; 2 3),< 2 4 ; 5)}n
> |domain error
> | '=' ((<0;0 1 2 3),(<1;2 3),<2 4;5)}n
>
> but
>
> '='((<0; 0 1 2 3),(<1;2 2 2 3),< 2 2 2 4 ; 5)}n
> ====OOOO
> OO==OOOO
> OOOOO=OO
> OOOOOOOO
> OOOOO=OO
>
> and
>
> (0,&.>0 1 2 3),(1,&.>2 3),2 4,&.>5
> +---+---+---+---+---+---+---+---+
> |0 0|0 1|0 2|0 3|1 2|1 3|2 5|4 5|
> +---+---+---+---+---+---+---+---+
> '=' ((0,&.>0 1 2 3),(1,&.>2 3),2 4,&.>5) } n
> ====OOOO
> OO==OOOO
> OOOOO=OO
> OOOOOOOO
> OOOOO=OO
>
>
>
>> On Sat, Nov 23, 2019 at 2:19 PM Jimmy Gauvin <[email protected]> wrote:
>>
>> Hi,
>>
>> is there any way of making this kind of assignment ?
>>
>> '='((<0; 0 1 2 3),(<1; 2 3),< 2 4 ; 5)}n
>> |domain error
>> | '=' ((<0;0 1 2 3),(<1;2 3),<2 4;5)}n
>>
>> But this works :
>> '='((<1; 2 3),< 2 4 ; 5)}n
>> OOOOOOOO
>> OO==OOOO
>> OOOOO=OO
>> OOOOOOOO
>> OOOOO=OO
>>
>> and so does :
>>
>> ((<0; 0 1 2 3),(<1; 2 3),< 2 4 ; 5){n
>>
>> OOOO
>>
>> OO
>>
>> OO
>>
>>
>>
>> Thanks
>> ----------------------------------------------------------------------
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>>
>
>
> --
>
> Devon McCormick, CFA
>
> Quantitative Consultant
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
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