Hi

You should use "copy" in this case.

https://metacpan.org/pod/PDL::Core#sever
https://metacpan.org/pod/PDL::Core#copy

On 08/26/2016 01:23 PM, Ingo Schmid wrote:
> 
> Hi,
> 
> I got this unexpected behaviour recently: I think it is a bug. If it is,
> it is very serious, I would say.
> v2.016.
> 
> Ingo
> 
> pdl> $a=rvals(5,5)
> 
> pdl> $b=$a->sever
> 
> pdl> p $a
> 
> [
>  [ 2.8284271   2.236068          2   2.236068  2.8284271]
>  [  2.236068  1.4142136          1  1.4142136   2.236068]
>  [         2          1          0          1          2]
>  [  2.236068  1.4142136          1  1.4142136   2.236068]
>  [ 2.8284271   2.236068          2   2.236068  2.8284271]
> ]
>  
> 
> pdl> p $b
> 
> [
>  [ 2.8284271   2.236068          2   2.236068  2.8284271]
>  [  2.236068  1.4142136          1  1.4142136   2.236068]
>  [         2          1          0          1          2]
>  [  2.236068  1.4142136          1  1.4142136   2.236068]
>  [ 2.8284271   2.236068          2   2.236068  2.8284271]
> ]
>  
> 
> pdl> $b(0,).=100
> 
> pdl> p $b
> 
> [
>  [       100   2.236068          2   2.236068  2.8284271]
>  [       100  1.4142136          1  1.4142136   2.236068]
>  [       100          1          0          1          2]
>  [       100  1.4142136          1  1.4142136   2.236068]
>  [       100   2.236068          2   2.236068  2.8284271]
> ]
>  
> 
> pdl> p $a
> 
> [
>  [       100   2.236068          2   2.236068  2.8284271]
>  [       100  1.4142136          1  1.4142136   2.236068]
>  [       100          1          0          1          2]
>  [       100  1.4142136          1  1.4142136   2.236068]
>  [       100   2.236068          2   2.236068  2.8284271]
> ]
>  
> 
> 
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