difference between d u;v and d u;v;w

[M.Mahakur]

Hi,


> Thank you all for your reply and suggestions.
>
> I wanna know how to set the ccolor to 1 while mag(u,v)<10?

Use clevs and ccols (see the grads doc for color code 0-15 and RGB settings. you can try
something as:

'set clevs 10 15 ....'
'set ccols 1 5 ....'

color (ccols) 0 and 1 as white (RGB: 0 0 0) and black (RGB: 255 255 255)..


>
> Thanks in advance.
>
> Best Regards,
>
> 2009-11-20
>
> Yan Libin
>
> [UTF-8?]发件人： L. Qi
> [UTF-8?]发送时间： 2009-11-20  15:48:06
> [UTF-8?]收件人： GRADSUSR
> [UTF-8?]æ „é€ï¼š
> [UTF-8?]主题： Re: difference between d u;v and d u;v;w
>
> When using "d u;v;w", the wind vector colors will change  with the
> magnitude of w; similarly, you can try "d u;v;mag(u,v)", in which the
> wind vector colors will change with the magnitude of wind velocity.
> There were discussions on this topic recently in this mail list
> (Subject: colored vector).
> For your second question, probably you can try to plot velocity
> contours at the same time, that is:
>  d u;v
>  d mag(u, v)
> Good luck.
> Regards,
> Lixin
> On Fri, Nov 20, 2009 at 1:32 AM, Yan Libin <zjuyanlibin at 163.com> wrote:
> > Hi, everyone!
> >
> > Can anyone tell me the difference between d u;v and d u;v;w?
> >
> > BTW, When I plotted the global U-V wind field, the U-V values of some places
> > were so large that
> > the others with small U-V values were invisible. Is there any method which
> > can overcome this problem?
> >
> > Any suggestion is welcome!
> >
> > Thanks in advance!
> >
> > Best regards,
> >
> > Libin Yan
> >
> >
> > 2009-11-19
> > ________________________________
> > Yan Libin
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