Hi Tan Dai,
It looks like you have little or no variance in your measurements, and
so the result is degenerate. The functions you are using are probably
working properly, but there is nothing to display.
Jim
On Sat, Dec 10, 2016 at 6:04 PM, Tan Dai Chuan via R-help
<r-help at r-project.org> wrote:> Hi, i face the problem as i attached in below. although i enlarge it, i
still a straight and any solutions to solve it? Hope can get repsonse this few
days. It is urgent.
>
> Thank you so much.
> Regards,Tan Dai Chuan
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