<br><font size=2 face="sans-serif">I think this will also work:</font>
<br><font size=2 face="sans-serif">'set clevs 0 [or any number]'</font>
<br>
<br><font size=2 face="sans-serif">When you display constant-field variable,
it should result in a blank map with no message. Note: I'm using GrADS
1.8 (Win32e).</font>
<br>
<br><font size=2 face="sans-serif">Steve Mc</font>
<br>
<br>
<br>
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<td width=40%><font size=1 face="sans-serif"><b>Dave Allured <dave.allured@NOAA.GOV></b>
</font>
<br><font size=1 face="sans-serif">Sent by: GRADSUSR@LIST.CINECA.IT</font>
<p><font size=1 face="sans-serif">11/27/2005 09:00 PM</font>
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<div align=center><font size=1 face="sans-serif">Please respond to<br>
GRADSUSR@LIST.CINECA.IT</font></div></table>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td valign=top><font size=1 face="sans-serif">GRADSUSR@LIST.CINECA.IT</font>
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<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
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<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td valign=top><font size=1 face="sans-serif">Re: remove "Constant
field. Value ="</font></table>
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<br><font size=2><tt>When I ran into this a while back, I found that it
was sufficient to<br>
change a single grid point by a small value, such as multiplying the<br>
corner point by 1.001, to make the constant field message go away.<br>
</tt></font>
<br><font size=2><tt>I mention this because it runs faster than computing
a trig function<br>
across the whole grid. This is not important if you are generating
only<br>
a few frames. Arindam's method is very elegant, occupying only one
line<br>
of code, and handling grids with distributed missing values.<br>
</tt></font>
<br><font size=2><tt>--Dave A.<br>
CDC/PSD/NOAA/CIRES<br>
</tt></font>
<br><font size=2><tt>Arindam Chakraborty wrote:<br>
</tt></font>
<br><font size=2><tt>>hi Yun,<br>
> since grads shades between two values rather
than at a single<br>
>value, you may have to add a slowly varying function to the constant<br>
>field you want to display. Set the clevs before the display. An<br>
>example for 2-d x-y grid:<br>
><br>
>...<br>
>'set gxout shaded'<br>
>'set clevs 10' * assuming var has the constant value of 10<br>
>'d var+cos(lat*3.1416/180)*1e-6'<br>
><br>
>where var is the constant field variable to display. The cos() allows<br>
>a slow variation in the field (along with the multiplication of 1e-6).<br>
>The order of magnitude of this factor should be must less than the<br>
>value of the variable to display.<br>
><br>
><br>
><br>
><br>
>On Sun, 27 Nov 2005, Ji-Yun SEO wrote:<br>
><br>
><br>
><br>
>>Hi, everyone,<br>
>> I'd like to display a constant field using Grads,<br>
>> unfortunately, there is always a warning of "Constant field.
Value = xx"<br>
>>on picture window, and I'm now asking about whether there is a
command to<br>
>>avoid such a warning?<br>
>> Thanks in advance.<br>
>><br>
>></tt></font>
<br><font size=2><tt>>></tt></font><font size=2 face="sans-serif"><br>
<br>
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