R devel - Dec 2005 - Rserve setSEXP command

Can any valid SEXP expression be given in the setSEXP command?

I tried to send a numeric matrix by including the dim attribute with the
data, but get an error code 68 (some parameters are invalid). Is the dim
attribute not supported by setSEXP? If so, does this mean a matrix
should be sent as a list, then a dim command sent in a second step?

Hi Chris,

On Dec 26, 2005, at 5:57 AM, Chris Burke wrote:
> Can any valid SEXP expression be given in the setSEXP command?
>
> I tried to send a numeric matrix by including the dim attribute  
> with the data, but get an error code 68 (some parameters are  
> invalid). Is the dim attribute not supported by setSEXP? If so,  
> does this mean a matrix should be sent as a list, then a dim  
> command sent in a second step?
It's a combination of a bug and missing feature. The bug is that the  
attribute of an expression is not decoded at all. The missing feature  
is that (dotted-pair) lists are not supported in decode, so you can't  
pass an attribute anyway, because they are stored in dotted-pair  
lists. So, for now, yes, you have to assign the names in a separate  
step - I'll need to fix that ... I'll keep you posted.

Thanks for spotting this!

Cheers,
Simon