<!DOCTYPE html PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'>
<html><head><meta http-equiv="Content-Type" content="text/html;charset=us-ascii">
<style>BODY{font:10pt Tahoma, Verdana, sans-serif}</style></head><body>
<div style="text-align: left;">you could create a mask with a circular shape:<br><div style="margin-left: 40px;">'define mask=maskout(lon,-1)'<br>loop over i, j in region of interest<br>'set defval mask i j 1'<br>check if it's a circle (d mask)<br>'set gxout stat'<br>'d field*mask'<br></div>it's all<br>hoping it helps<br>bye bye<br>Davide<br></div><blockquote style="padding-left: 5px; margin-left: 5px; border-left: 2px solid rgb(0, 0, 255); margin-right: 0px;"><hr><b>From:</b> Rodrigo de Souza Barreto Mathias [mailto:rodrigowind@yahoo.com.br]<br><b>To:</b> gradsusr@gradsusr.org [mailto:gradsusr@gradsusr.org]<br><b>Sent:</b> Sat, 25 Feb 2012 06:05:32 +0100<br><b>Subject:</b> [gradsusr] Meteorological field in circular area<br><br><div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: times new roman,new york,times,serif; font-size: 12pt;"><div><div>Good morning!</div><div>I wanna calculate a meteorological field in a circular area with radius R starting at a point (lat, lon). For example: average temperature in a circular area with 200 km of radius from a point 20N/020W. I don't know a specific function in Grads to do what I want. Could you help me with some function or a script using a mask?</div><div><br></div><div>Thanks a lot!</div><div>Rodrigo Mathias</div></div></div></blockquote><style>
</style>
</body></html>