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Re: [ferret_users] How to use barb with Ferret
Hi Ashranf,
I don't know grads so I can't say exactly what the equivalent Ferret
command might be. It looks like this commad is skipping some data and
plotting vectors. The Ferret command VECTOR/XSKIP/YSKIP will do this.
Ferret does not have the option of removing the arrows on vectors (is
that what is meant by a barb plot?), but there is a script called
poly_vectors.jnl that draws vectors using polygons, and using that
script you can choose not to draw the arrows. Please run the demo script
yes? go poly_vec_demo
For examples of how to call this script. Read the text as the demo
runs; there are some variables to define before running
poly_vectors.jnl. There is also a script vector_demo.jnl which shows a
variety of ways to draw vector plots with the standard VECTOR command.
To set the line type for contour lines, you need to use settings on the
/LEVELS qualifier. The LINE sets the line type to a solid line for the
contour levels that are given just after it. Normally the negative
contour levels would be dashed, so this comand resets them to a thin
solid line
yes? use etopo120
yes? contour/lev="(-4000,4000,1000)LINE(-4000,-1000,1000)" rose
Once again, there is a demo script for this topic:
yes? go custom_contour_demo.jnl
There are a number of Ferret demonstrations. Some are available as
on-line demos with graphics and text, others are just scripts. They are
all listed at
http://www.ferret.noaa.gov/Ferret/on_line_demonstrations.html
Ansley
Ashraf Zakey wrote:
Hello everyone,
I would like to draw wind speed and direction
using barb. For example in Grads we can do it as:
set gxout barb
d skip(u*2,6,6);v*2
How we can do it in Ferret?
-Also, I noticed that the negative contour in Ferret
it take dot style , How I can force this contouro
be solid style.
Looking for your kind reply
All the best
Ashraf
''~``
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| Ashraf Saber Zakey |
| Department of Chemistry |
| Atmospheric Science group |
| Universty of Gothenburg |
| SE 412 96 Gothenbrg |
| Sweden |
| e-mail: zakey@chem.gu.se |
| ashraf_saber123@yahoo.com |
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