ROutputParser is parsing NA as 0

[gb5256]

Hi,
please check this function:

public function singleNumber($output)
{
    //TODO properly check if r output is a valid number
    return 0 + substr($output, 4);
}

The problem is that if the return from R is like this:
[0] NA
the script will return "0".
But 0 is something else than NA, right?

gb5256

[kachkaev]

Yeah, it should probably return null in this case. Could you please submit a PR?