On Tue, Feb 2, 2010 at 8:26 AM, Gisele Zepka <span dir="ltr"><<a href="mailto:gzepka@dge.inpe.br">gzepka@dge.inpe.br</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hello users!!<br>
<br>
I have two files with different resolutions and I want to compare the differences between them. I used the regrid function to take both in the same resolution. The regrided file is just one hour, while in the other I have a range of 22 times. I want to compare just the hour of the first, so I have two problems when I try to do that: an error of resolution, because the two files don't have the same quantity of points in x and y and I don't know how to set the time just for the second and then calculate the difference.<br>
<br></blockquote><div><br></div><div>I am not sure I understand exactly what your problem is. First step is to get the 2 files in the same horizontal grid. This means the same number of points and same origin. Same grid. You can do that with the re() function that comes with the opengrads bundle:</div>
<div><br></div><div> <a href="http://opengrads.org/doc/udxt/re/">http://opengrads.org/doc/udxt/re/</a></div><div><br></div><div>For the sake of argument let's say that you have done the regridding and prepared 2 files on the same grid. Then open the 2 files</div>
<div><br></div><div>ga-> open file1</div><div>ga-> open file2</div><div><br></div><div>To compare variables valid at different times explicitly specify the t-index, e.g.,</div><div><br></div><div>ga-> d var.2(t=3) - var.1(t=1)</div>
<div><br></div><div> Good Luck,</div><div><br></div><div> Arlindo</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Please any help will be nice!<br>
<br>
Thanks,<br>
Gisele<br><font color="#888888">
<br>
<br>
-- <br>
Msc. Gisele dos Santos Zepka<br>
Atmospheric Electricity Group (ELAT)<br>
National Institute for Space Research (INPE)<br>
Av. dos Astronautas, 1758<br>
São José dos Campos/ SP/ Brazil CEP 12227-010<br>
Phone ++55(12)39456841<br>
</font></blockquote></div><br><br clear="all"><br>-- <br>Arlindo da Silva<br><a href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a><br>