R help - Oct 2021 - Strange behavior of 2-d array within function

Hi,

I have a function, which defines an array of dimensions 5000 by 60, calculates
the values within that array and then returns the array on exit.

I get an error: Error in my_simulated[ir, 1:it] : incorrect number of dimensions

For some strange reason, the array is somehow being changed from
       mode "numeric" and attributes $dim=6000 by 50
       to
       mode "list" and attributes NULL

This change occurs at more or less random iterations within a loop (all within
the same function call). I am not explicitly manipulating the mode or attributes
of the array after it is created.

I would appreciate any suggestions on what may be causing this problem. I have
stared at the code for a long time, run the debugger, etc.

Thanks,

Gabriel

	[[alternative HTML version deleted]]

Likely impossible to answer without seeing your  code.

Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Wed, Oct 6, 2021 at 11:33 AM Gabriel Toro <toro at lettisci.com> wrote:
> Hi,
>
> I have a function, which defines an array of dimensions 5000 by 60,
> calculates the values within that array and then returns the array on exit.
>
> I get an error: Error in my_simulated[ir, 1:it] : incorrect number of
> dimensions
>
> For some strange reason, the array is somehow being changed from
>        mode "numeric" and attributes $dim=6000 by 50
>        to
>        mode "list" and attributes NULL
>
> This change occurs at more or less random iterations within a loop (all
> within the same function call). I am not explicitly manipulating the mode
> or attributes of the array after it is created.
>
> I would appreciate any suggestions on what may be causing this problem. I
> have stared at the code for a long time, run the debugger, etc.
>
> Thanks,
>
> Gabriel
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
	[[alternative HTML version deleted]]

Hi

I would print/save iteration number to see at what time this occured and
probably traceback() could give you some hint.
Alternatively you could make a function from your code see ?function and use
debug to trace the error.

Without some working example it is impossible to see where is the problem.

Cheers
Petr
> -----Original Message-----
> From: R-help <r-help-bounces at r-project.org> On Behalf Of Gabriel
Toro
> Sent: Wednesday, October 6, 2021 8:32 PM
> To: r-help at r-project.org
> Subject: [R] Strange behavior of 2-d array within function
> 
> Hi,
> 
> I have a function, which defines an array of dimensions 5000 by 60,
calculates
> the values within that array and then returns the array on exit.
> 
> I get an error: Error in my_simulated[ir, 1:it] : incorrect number of
dimensions
> 
> For some strange reason, the array is somehow being changed from
>        mode "numeric" and attributes $dim=6000 by 50
>        to
>        mode "list" and attributes NULL
> 
> This change occurs at more or less random iterations within a loop (all
within
> the same function call). I am not explicitly manipulating the mode or
> attributes of the array after it is created.
> 
> I would appreciate any suggestions on what may be causing this problem. I
> have stared at the code for a long time, run the debugger, etc.
> 
> Thanks,
> 
> Gabriel
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.