Hi Zeng, This kind of plot is called a "stick plot" in the Ferret documentation. The plot style looks similar to your figure, but does not have arrow heads on the vector lines. Here is an example: yes? use monthly_navy_winds yes? set region/x=180/y=0 yes? plot/set uwnd,vwnd yes? ppl plotuv Here is a message from the Users' List archives which gives another example and more details about using the VECTOR command for this kind of plot. http://ferret.pmel.noaa.gov/Ferret/Mail_Archives/fu_2003/msg00395.html Ansley Manke Ganning Zeng wrote: dear ferret users How does ferret plot the vector's time series file? like what shows in the following attachment,i.e.horizontal coordinate is time,vertical coordinate is U(U=sqrt(u*u+v*v)). thank you very much. Led_rs@scsio.ac.cn 2003-10-22 |