<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Once you extract all you can then just pick the points you like to use. </div><div><br>On 28 Feb 2017, at 17:20, <<a href="mailto:youchamianshidai@sina.com">youchamianshidai@sina.com</a>> <<a href="mailto:youchamianshidai@sina.com">youchamianshidai@sina.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div><span style="color: rgb(51, 51, 51); font-family: Verdana, 宋体, Helvetica, sans-serif; font-size: 18.6667px; line-height: 30.9867px;">Dear All:</span> </div><div><span style="color: rgb(51, 51, 51); font-family: Verdana, 宋体, Helvetica, sans-serif; font-size: 18.6667px; line-height: 30.9867px;"> I have a problem with my calculations. I want to extract the density data of the same point in several periods, </span><font color="#333333" face="Verdana, 宋体, Helvetica, sans-serif"><span style="font-size: 18.6667px; line-height: 30.9867px;">but I don't know how to solve it. I can only extract the data of all grid points. </span></font><span style="font-size: 18.6667px; line-height: 30.9867px; color: rgb(51, 51, 51); font-family: Verdana, 宋体, Helvetica, sans-serif;">If anyone knows, I hope you can tell me. I would be very grateful!</span></div><div><span style="font-size: 18.6667px; line-height: 30.9867px; color: rgb(51, 51, 51); font-family: Verdana, 宋体, Helvetica, sans-serif;"> Best wishes</span></div></div></blockquote><blockquote type="cite"><div><span></span><br><span></span><br><span>----</span><br><span>Comp-phys-alps-users Mailing List for the ALPS Project</span><br><span><a href="http://alps.comp-phys.org/">http://alps.comp-phys.org/</a></span><br><span></span><br><span>List info: <a href="https://lists.phys.ethz.ch//listinfo/comp-phys-alps-users">https://lists.phys.ethz.ch//listinfo/comp-phys-alps-users</a></span><br><span>Archive: <a href="https://lists.phys.ethz.ch//pipermail/comp-phys-alps-users">https://lists.phys.ethz.ch//pipermail/comp-phys-alps-users</a></span><br><span></span><br><span>Unsubscribe by writing a mail to <a href="mailto:comp-phys-alps-users-leave@lists.phys.ethz.ch">comp-phys-alps-users-leave@lists.phys.ethz.ch</a>.</span></div></blockquote></body></html>