<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I have looked into the problem and it is not obvious what the solution is. Yes a bug report with some test data would help.<div class=""><br class=""></div><div class="">Arno</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Sep 2, 2015, at 6:44 PM, Makoto Miyakoshi <<a href="mailto:mmiyakoshi@ucsd.edu" class="">mmiyakoshi@ucsd.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><i style="font-family: Helvetica; font-size: 13.333333015441895px; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">Eigenvalue range sigma must be a valid 2-element string</i></div></blockquote></div><br class=""></div></body></html>