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    Hi Elikana,<br>
    <br>
    Based on your code, it would seem the coordinates for your
    individuals are saved in FRAcoordinates. Hence try:<br>
    <br>
    FRA.lxy <- xyt.lxy(xy=<font color="#ff0000">FRAcoordinates</font>,
    dt=FRA.localtime, id="FRA",proj4string=CRS("+proj=utm +south
    +zone=36 +ellps=WGS84"))<br>
    <br>
    If you still get the error message, email me back and I'll help you
    diagnose the error.<br>
    <br>
    Cheers,<br>
    <br>
    Andy<br>
    <br>
    <br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 2/15/2015 6:04 PM, elikana kalumanga
      wrote:<br>
    </div>
    <blockquote
      cite="mid:271837679.3882918.1424052263795.JavaMail.yahoo@mail.yahoo.com"
      type="cite">
      <div style="color:#000; background-color:#fff;
        font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica
        Neue, Helvetica, Arial, Lucida Grande,
        sans-serif;font-size:16px">
        <div><span></span></div>
        <div id="yui_3_16_0_1_1424042947328_16059" dir="ltr"> Hi people,</div>
        <div id="yui_3_16_0_1_1424042947328_23298" dir="ltr"><br>
        </div>
        <div id="yui_3_16_0_1_1424042947328_27208" dir="ltr">I am at
          the very initial stages of learning tlocoh so that I
          can estimate home ranges and calculate revisitation rate of
          elephants. While creating an xyt.lxy object, I constantly
          receive error message; <font
            id="yui_3_16_0_1_1424042947328_26608" color="#cd232c"><strong
              id="yui_3_16_0_1_1424042947328_28174">Error in min(xy[,
              1]) : invalid 'type' (S4) of argument. </strong><font
              id="yui_3_16_0_1_1424042947328_27818" color="#000000">I
              will be happy to know what is going wrong with my code? </font></font></div>
        <div id="yui_3_16_0_1_1424042947328_27811"><br>
        </div>
        <div id="yui_3_16_0_1_1424042947328_27510" dir="ltr"><font
            id="yui_3_16_0_1_1424042947328_27508" color="#cd232c"><font
              id="yui_3_16_0_1_1424042947328_28777" color="#000000">Thanks,
              and here are my codes: </font> </font><br>
        </div>
        <div id="yui_3_16_0_1_1424042947328_18811"><br>
        </div>
        <div id="yui_3_16_0_1_1424042947328_18810"><br>
        </div>
        <div class="signature" id="yui_3_16_0_1_1424042947328_18196"><font
            id="yui_3_16_0_1_1424042947328_17564" color="#4c76a2">>
            head(FRAcoordinates)</font><br>
                   x       y<br>
          0 386924.1 9369662<br>
          1 387761.6 9369931<br>
          <br>
          <font id="yui_3_16_0_1_1424042947328_18809" color="#4c76a2">>
            head(as.character(FRA$Date_))</font><br>
          [1] "2012-08-31 20:09:00.000" "2012-08-31 16:09:00.000"
          "2012-08-31 12:09:00.000"<br>
          [4] "2012-08-31 8:10:00.000"  "2012-08-31 4:09:00.000" 
          "2012-08-31 0:11:00.000" </div>
        <div class="signature" id="yui_3_16_0_1_1424042947328_18197"><br>
          <font color="#4c76a2">> FRA.localtime[1:3]</font><br>
          [1] "2012-08-31 23:09:00 EAT" "2012-08-31 19:09:00 EAT"
          "2012-08-31 15:09:00 EAT"<br>
        </div>
        <div class="signature" id="yui_3_16_0_1_1424042947328_16592"><br>
        </div>
        <div class="signature" id="yui_3_16_0_1_1424042947328_16593">><font
            id="yui_3_16_0_1_1424042947328_18508" color="#4c76a2">
            FRA.lxy <- xyt.lxy(xy=FRA, dt=FRA.localtime,
            id="FRA",proj4string=CRS("+proj=utm +south +zone=36
            +ellps=WGS84"))<br>
          </font><strong id="yui_3_16_0_1_1424042947328_16944"><font
              id="yui_3_16_0_1_1424042947328_16943" color="#cd232c">Error
              in min(xy[, 1]) : invalid 'type' (S4) of argument<br>
            </font></strong><br>
        </div>
        <div class="signature" id="yui_3_16_0_1_1424042947328_16062"><br>
        </div>
        <div class="signature" id="yui_3_16_0_1_1424042947328_29683"
          dir="ltr">/Elikana</div>
        <div class="signature" id="yui_3_16_0_1_1424042947328_29983"
          dir="ltr">University of Dar es Salaam-Tanzania</div>
        <div class="qtdSeparateBR"><br>
          <br>
        </div>
        <div class="yahoo_quoted" style="display: block;">
          <div style="font-family: HelveticaNeue-Light, Helvetica Neue
            Light, Helvetica Neue, Helvetica, Arial, Lucida Grande,
            sans-serif; font-size: 16px;">
            <div style="font-family: HelveticaNeue, Helvetica Neue,
              Helvetica, Arial, Lucida Grande, sans-serif; font-size:
              16px;">
              <div dir="ltr"> <font face="Arial" size="2"> On
                  Wednesday, February 11, 2015 7:33 PM, Andy Lyons
                  <a class="moz-txt-link-rfc2396E" href="mailto:lyons.andy@gmail.com"><lyons.andy@gmail.com></a> wrote:<br>
                </font> </div>
              <br>
              <br>
              <div class="y_msg_container">
                <div id="yiv6929604027">
                  <div> Hi Julia, <br>
                    <br>
                    That's a good question. It seems you need a way to
                    identify hulls that belong to specific sites, and
                    save the site location as an ancillary variable
                    (which can then serve as a hull metric). There isn't
                    a function currently in the package that can
                    classify points or hulls based on their location in
                    space, but we could develop one because I think this
                    would have general utility. <br>
                    <br>
                    How specifically would you want to assign points /
                    hulls to sites? One option for defining a site would
                    be with a polygon, either by drawing one on the plot
                    window or bringing in a shapefile. Another option
                    would be defining a site based on distance from a
                    given location (i.e., a circle). After defining the
                    site, would you want to say that any point (and thus
                    the hull for that point) that falls within the site?
                    Or would you only want hulls whose entire area falls
                    within the site? <br>
                    <br>
                    Comment from other people welcome also. <br>
                    <br>
                    Thanks.<br>
                    <br>
                    Andy<br>
                    <br>
                    <br>
                    <blockquote type="cite">
                      <div class="yiv6929604027"><br
                          class="yiv6929604027">
                        <div>
                          <blockquote class="yiv6929604027" type="cite">
                            <div class="yiv6929604027">On Feb 11, 2015,
                              at 5:53 AM, Julia Krejci <<a
                                moz-do-not-send="true"
                                class="yiv6929604027"
                                href="mailto:julia.krejci@chello.at"
                                target="_blank" rel="nofollow"
                                ymailto="mailto:julia.krejci@chello.at">julia.krejci@chello.at</a>>

                              wrote:</div>
                            <br
                              class="yiv6929604027Apple-interchange-newline">
                            <div class="yiv6929604027">
                              <div class="yiv6929604027WordSection1"
                                style="font: 12px/normal Helvetica;
                                text-transform: none; text-indent: 0px;
                                letter-spacing: normal; word-spacing:
                                0px; white-space: normal;
                                font-size-adjust: none; font-stretch:
                                normal; background-color: rgb(255, 255,
                                255);">
                                <div class="yiv6929604027MsoNormal"
                                  style="margin: 0cm 0cm 12pt;
                                  font-family: Calibri, sans-serif;
                                  font-size: 11pt;"><span
                                    class="yiv6929604027" style="color:
                                    rgb(31, 73, 125);" lang="EN-GB">Dear
                                    Mailinglist,</span></div>
                                <div class="yiv6929604027MsoNormal"
                                  style="margin: 0cm 0cm 12pt;
                                  font-family: Calibri, sans-serif;
                                  font-size: 11pt;"><span
                                    class="yiv6929604027" style="color:
                                    rgb(31, 73, 125);" lang="EN-GB">I’m
                                    currently trying to compare hull
                                    metrics (nsv and mnlv) of several
                                    individuals and several sites. I
                                    want to know how long and how often
                                    individual A visited site 1 and 2
                                    and the same for individual B. Is
                                    there a way to get more accurate
                                    values for specific sites than I can
                                    receive from the images? Currently I
                                    have just plotted the hpp with the
                                    respective colour code and try to
                                    compare colours but of course that’s
                                    not very accurate, also because the
                                    colours only represent ranges of
                                    values (like, yellow is 1 – 12,
                                    orange is 12 – 24 and so on).<span
                                      class="yiv6929604027Apple-converted-space"> </span>
                                  </span></div>
                                <div class="yiv6929604027MsoNormal"
                                  style="margin: 0cm 0cm 12pt;
                                  font-family: Calibri, sans-serif;
                                  font-size: 11pt;"><span
                                    class="yiv6929604027" style="color:
                                    rgb(31, 73, 125);" lang="EN-GB">Thank
                                    you for every advice!
                                  </span></div>
                                <div class="yiv6929604027MsoNormal"
                                  style="margin: 0cm 0cm 12pt;
                                  font-family: Calibri, sans-serif;
                                  font-size: 11pt;"><span
                                    class="yiv6929604027" style="color:
                                    rgb(31, 73, 125);" lang="EN-GB">Best
                                    wishes,<span
                                      class="yiv6929604027Apple-converted-space"> </span>
                                  </span></div>
                                <div class="yiv6929604027MsoNormal"
                                  style="margin: 0cm 0cm 12pt;
                                  font-family: Calibri, sans-serif;
                                  font-size: 11pt;"><span
                                    class="yiv6929604027" style="color:
                                    rgb(31, 73, 125);" lang="EN-GB">Julia<span
class="yiv6929604027Apple-converted-space"> </span>
                                  </span></div>
                              </div>
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                <br>
                _______________________________________________<br>
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