Hi Ashraf, There are a couple of different ways to do this. There is a script, multi_variable_demo, which shows how to use some tools written for this. There can sometimes be problems with these scripts when used with time series; the line sample that they draw for a key may not be drawn. Another way, when you want one scale on the left and another on the right, but with the same horizontal axis, is to define two viewports, exactly the same size and location, and draw each variable in its own viewport. The plots are drawn on top of each other, creating an overlay effect. With this method, you have to do some work to get the labelling correct: The unlabel commands remove the Longitude and Latitude labels that are automatically placed in the upper left; and the /TITLE qualifiers set a general title that applies to both plots. yes? use coads_climatology yes? let aa = sst[x=180,y=0] yes? let bb = sst[x=180,y=40] yes? define view/x=0:1/y=0:1 aaview yes? define view/x=0:1/y=0:1 bbview yes? set view aaview yes? plot/axes=1,1,1,0/color=red/title="SST"/set aa yes? ppl ylab "Deg C (180,0)" yes? go unlabel 4 yes? go unlabel 5 yes? ppl plot yes? set view bbview yes? plot/axes=1,1,0,1/color=blue/title=" "/set bb yes? ppl ylab "Deg C (180,40)" yes? go unlabel 4 yes? go unlabel 5 yes? ppl plot Ashraf Zakey wrote: Hi, Ansley: Thank you very much for your kind reply and for your help. As matter of fact, I'm new user for Ferret and I found that it is very interesting visualization package. I think my contour line looking good now. One more question please, I have netcdf data and I would like to select one grid point "latitude, longitude" and on one panel I would like to draw two variables each of them has different scale. How I can do that? Is there any possibility to draw and backward trajectory? Thanks one more for your kind help All the best Ashraf --- Ansley Manke <ansley.b.manke@noaa.gov> wrote: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 athttp://www.ferret.noaa.gov/Ferret/on_line_demonstrations.htmlAnsley 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 inFerretit take dot style , How I can force this contouro be solid style. Looking for your kind reply All the best Ashraf''~`` ( o o ) +------------------.oooO--(_)--Oooo.------------------+ | | | 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 | | | | .oooO | | ( ) Oooo. | +---------------------\ (----( )--------------------+ \_) ) / (_/ ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs |