[R] Parse Expression

[Duncan Murdoch]

livia wrote:
> Hello everyone, I would like to construct a datafram with the following
> command. 
>
> eval(parse(text=paste("df=data.frame(", cmd, ")", sep="")))
>
> But it comes out " Error in parse(file, n, text, prompt, srcfile, encoding)
> : 
>         syntax error, unexpected $undefined, expecting ',' in
> "df=data.frame(cbcDummy10to12 = 1,cbcForeWrld_Ret = 1,cbcYC10-2_"
>
>
> "cmd" is a character string I obtained before, it is like:
>  
> cmd
> [1] "cbcDummy10to12 = 1,cbcForeWrld_Ret = 1,cbcYC10-2_wld = 1"
>
> Could anyone give me some advice? Many thanks.
>   
You can't have a hyphen "-" in a variable name, i.e. cbcYC10-2_wld is 
not legal.  It is treated as a subtraction.
I think the "$undefined" refers to 2_wld; the parser has no idea what 
that is supposed to be. 

Duncan Murdoch


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