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    Hi Soma,<br>
    <br>
    the warning is telling you exactly what is wrong. Your latitude
    values associated with your variable t is decreasing not increasing.
    <br>
    <br>
    <div style="font-size: 12.8px;" dir="auto"><tt>      level: [   1.. 
        60]</tt></div>
    <div style="font-size: 12.8px;" dir="auto"><tt><b>      latitude:
          [40.. 0]</b></tt></div>
    <div style="font-family:sans-serif;font-size:12.8px" dir="auto"><tt> 
            longitude: [65..100]</tt><br>
      <br>
      Reorder lat dimension of the variable     <tt>t = t(:,::-1,:)</tt>   
      <br>
      <br>
      -Karin<br>
      <br>
    </div>
    <div class="moz-cite-prefix">Am 20.06.18 um 09:28 schrieb Soma Roy:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAAJRSQdtvt98J_hCXWJGGiiwi7doWPzKhAOT3fATiMns-oxEog@mail.gmail.com">
      <div dir="auto">Hello
        <div dir="auto"><br>
        </div>
        <div dir="auto">I am trying to plot transect of vertical
          velocity using ERA-interim pressure level data.</div>
        <div dir="auto">For this I am using the attached script below.</div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">I am getting this warnings:</div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">
            <div>warning:linint2_points: xi and yi must be monotonically
              increasing</div>
            <div>warning:linint2_points: xi and yi must be monotonically
              increasing</div>
            <div>warning:linint2_points: xi and yi must be monotonically
              increasing</div>
            <div>warning:linint2_points: xi and yi must be monotonically
              increasing</div>
            <div>warning:linint2_points: xi and yi must be monotonically
              increasing</div>
          </div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto"><br>
          </div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">
            <div>Variable: trans</div>
            <div>Type: float</div>
            <div>Total Size: 24000 bytes</div>
            <div>            6000 values</div>
            <div>Number of Dimensions: 2</div>
            <div>Dimensions and sizes:   [60] x [100]</div>
            <div>Coordinates:</div>
            <div>Number Of Attributes: 8</div>
            <div>  missing_value :       -32767</div>
            <div>  missing_value_original :      -32767</div>
            <div>  _FillValue_original : -32767</div>
            <div>  units :       Pa s**-1</div>
            <div>  long_name :   Vertical velocity</div>
            <div>  standard_name :     
               lagrangian_tendency_of_air_pressure</div>
            <div>  time :        969336</div>
            <div>  _FillValue :  -32767</div>
            <div>warning:ContourPlotInitialize: no valid values in
              scalar field; ContourPlot not possible:[errno=1101]</div>
            <div>warning:ContourPlotSetValues: cnLevelSpacingF value
              exceeds or equals data range: defaulting</div>
          </div>
        </div>
        <div dir="auto"><br>
        </div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">PrintVarSummary of the input data is below;</div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">Variable: t</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">Type: float</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">Total Size: 5448240 bytes</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">            1362060 values</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">Number of Dimensions: 3</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">Dimensions and sizes:   [level | 60] x [latitude
            | 161] x [longitude | 141]</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">Coordinates:</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">            level: [   1..  60]</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">            latitude: [40.. 0]</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">            longitude: [65..100]</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">Number Of Attributes: 8</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">  time :        969336</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">  standard_name :     
             lagrangian_tendency_of_air_pressure</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">  long_name :   Vertical velocity</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">  units :       Pa s**-1</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">  _FillValue_original : -32767</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">  _FillValue :  -32767</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">  missing_value_original :      -32767</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto">  missing_value :       -32767</div>
          <div style="font-family:sans-serif;font-size:12.8px"
            dir="auto"><br>
          </div>
        </div>
        <div dir="auto">Kindly inform me how to resolve it.</div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">Thanks,</div>
        <div dir="auto">Soma</div>
      </div>
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    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Dipl. Geophys. Karin Meier-Fleischer
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