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    Use addfiles to read all 24 files and select the variable which you
    want to write to the new file.<br>
    <br>
    Assume your 24 files are netCDF  and their names start with
    'infile':<br>
    <br>
    <font color="#3333ff"><tt>...<br>
        filelist = systemfunc("ls infile*.nc")</tt><tt><br>
      </tt><tt><br>
      </tt><tt>f = addfiles(filelist,"r")</tt><tt><br>
      </tt><tt><br>
      </tt><tt>pres_pa = wrf_user_getvar(wrfin,"pres",-1) </tt></font>
    <div><font color="#3333ff"><tt>t_k     =
          wrf_user_getvar(wrfin,"tk",-1)</tt></font></div>
    <br>
    <font color="#3333ff"><tt>system("rm -rf "+file_out)</tt><span
        class=""><tt><br>
        </tt><tt>wrfpost = addfile(file_out,"c")<br>
          ...<br>
          <br>
        </tt></span></font>-Karin<br>
    <br>
    <div class="moz-cite-prefix">Am 19.01.18 um 13:33 schrieb Noelia
      otero:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAG7o=LsrLxXj2DE5EPXQBpZFObZ=ECgRx+XbJiLx2ZWSSHzTfQ@mail.gmail.com">
      <div dir="ltr">Hi Karin,
        <div><br>
        </div>
        <div>Yes, I know..that's why I am not sure how I can do it. If I
          have 24 files for one day, I just wanted to extract some
          variables and storage the daily values in one single file. </div>
        <div>Is there any way? If I use system("rm -rf" +file_out) my
          file with previous value is removed...so I would have a new
          file with the current time, which I don't want.. any
          suggestion? </div>
        <div><br>
        </div>
        <div>Thanks!</div>
        <div>Noelia</div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">2018-01-19 13:30 GMT+01:00 Karin
          Meier-Fleischer via ncl-talk <span dir="ltr"><<a
              href="mailto:ncl-talk@ucar.edu" target="_blank"
              moz-do-not-send="true">ncl-talk@ucar.edu</a>></span>:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div text="#000000" bgcolor="#FFFFFF"> Hi Noelia,<br>
              <br>
              NCL can't create a new file when it already exits. You
              have to make sure that the file doesn't exist or delete it
              before using addfile.<br>
              <br>
              <font color="#3333ff"><tt>system("rm -rf "+file_out)</tt><span
                  class=""><tt><br>
                  </tt><tt>wrfpost = addfile(file_out,"c")</tt></span></font><br>
              <br>
              -Karin<br>
              <br>
              <div class="m_-3521044922961557663moz-cite-prefix">Am
                19.01.18 um 13:15 schrieb Noelia otero via ncl-talk:<br>
              </div>
              <blockquote type="cite">
                <div>
                  <div class="h5">
                    <div dir="ltr">Hi all,
                      <div><br>
                      </div>
                      <div>I have hourly files from WRF and I wanted to
                        create daily files (with the hourly outputs,
                        Time=24). I was using addfile(, "c")....I know
                        the error I got it is caused by "c", once the
                        first file is created I can´t opened again..(If
                        I am not wrong, right?) Is there any way to do
                        it?</div>
                      <div><br>
                      </div>
                      <div>
                        <div>
                          <div>print(file_in)</div>
                          <div>; wrfout_d01_2010-01-01_00:00:<a
                              href="http://00.nc" target="_blank"
                              moz-do-not-send="true"><wbr>00.nc</a></div>
                          <div>wrfin = addfile(file_in,"r")</div>
                          <div><br>
                          </div>
                          <div>; I want the output: file_out=<a
                              href="http://met_wrfout_d01_2010-01-01.nc"
                              target="_blank" moz-do-not-send="true">met_wrfout_d01_2010-<wbr>01-01.nc</a> </div>
                          <div>wrfpost = addfile(file_out,"c")   
                            ;create new netCDF file<br>
                          </div>
                          <div><br>
                          </div>
                          <div>pres_pa = wrf_user_getvar(wrfin,"pres",-<wbr>1)</div>
                          <div>t_k = wrf_user_getvar(wrfin,"tk",-1)</div>
                        </div>
                        <div><br>
                        </div>
                        <div>
                          <div>wrfpost->t_k= t_k</div>
                          <div>wrfpost->pres_pa= pres_pa</div>
                        </div>
                        <div>
                          <div><br>
                          </div>
                          <div>Time = wrf_user_getvar(wrfin,"Times",<wbr>-1)</div>
                          <div>lat = wrf_user_getvar(wrfin,"lat",-<wbr>1)</div>
                          <div>lon = wrf_user_getvar(wrfin,"lon",-<wbr>1)</div>
                          <div><br>
                          </div>
                          <div>wrfpost->time    = Time</div>
                          <div>wrfpost->lat= lat</div>
                          <div>wrfpost->lon= lon</div>
                        </div>
                      </div>
                      <div><br>
                      </div>
                      <div><br>
                      </div>
                      <div>Thanks in advance,</div>
                      <div>Best</div>
                      <div>Noelia</div>
                      <div><br>
                      </div>
                    </div>
                    <br>
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                    <br>
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              </blockquote>
              <br>
              <pre class="m_-3521044922961557663moz-signature" cols="72">-- 
Dipl. Geophys. Karin Meier-Fleischer
Visualization, NCL, CDO
Application Support

Deutsches Klimarechenzentrum GmbH (DKRZ)
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</pre>
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