Shading the solution of quadratic inequality
An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-sig-teaching/attachments/20120215/881f3fd5/attachment.pl>
An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-sig-teaching/attachments/20120215/881f3fd5/attachment.pl>