Re: ppl VECSET and VECKEY commands

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi Vincent,
You need both the VECSET and VECKEY commands.  I will assume we
are keeping length of the arrow in the key at 0.5 inches.  VECSET resets the
vector length that is equivalent to the length on the page of 0.5 plot inches,
the length of the key. It changes the lengths of all the arrows on the plot, so
that vectors having the physical length of the second argument to VECSET
(5 m/s) has the plot-length of the first argument (0.5 inches) . Compare the
vector field in your plot  if you use "vecset 0.5, 1", and then use "vecset 0.5, 5". 
If you give the command "vecset 0.5, 5"  the key label will now be 5, because
the standard vector arrow of 0.5 inches now represents the physical vector
length 5 m/s. 

Then you can use VECKEY to position and label the vector key.  For example:

   yes? use coads_climatology
   yes? set region/L=1/x=240:280/y=0:20

   yes? vector uwnd,vwnd
       !  Here the default key is labeled as 8.13

   yes? vector/set uwnd,vwnd
   yes? ppl vecset 0.5, 5.
   yes? ppl veckey/nouser 3.5,-1.3,,(f3.0," m/s")
   yes? ppl vector 
       !  The vectors are longer, and the key is labeled as 5 m/s

   yes? vector/over/set uwnd,vwnd
   yes? ppl vecset 0.5, 10.
   yes? ppl veckey/nouser 5.5,-1.3,,(f3.0," m/s")
   yes? ppl vector/over
       ! Now, 0.5 inches represents 10 m/s so the vectors are
       ! shorter, and the key is labeled as 10. m/s


Vincent Le Fouest wrote:

Hi, 
Actually, the problem is the following:

Using the default arguments of the VECSET command I obtain a too much
longer arrow relative to my plot with a label corresponding in my case
to the mean wind field intensity of my 2D grid, i.e. 1.3E01

Using ppl VECSET 0.5,1, I obtain an arrow of correct length but it
substitutes my numerical label 1.3E01 by 1
Similarly, using ppl VECSET 0.5,5 it substitutes my numerical label
1.3E01 by 5

do You have an idea?

Vincent



On Thu, 2003-12-04 at 14:52, William.S.Kessler@noaa.gov wrote:
  

Use VECSET only to set the vector scale length.
Use VECKEY to control the label format and text:

vector/set .... var1,var2
ppl veckey,xpos,ypos,,(f3.0," m s^-^1")
ppl vector

Note that the numerical part of the format must be
floating point, not integer. Using f3.0 as above will
leave an unwanted decimal point but that shouldn't be
too much of a problem.

Also note that the 3rd argument to VECKEY is not used,
and must be passed over with those sequential commas.

Billy K

    

I have some difficulties with the ppl VECSET and VECKEY commands.

Using the default arguments of the VECSET command, VECKEY draws a vector
key with a label indicating, in my case, "13 m/s" (it is the mean value
of my 2D wind field). Using the following command "ppl VECSET 0.5,1", it
gives me a good length of my vector key but replaces my label "13 m/s"
by "1". Does somebody know how to conserve my "13 m/s" label or if it is
possible to modify the VECSET command?

Thanks,

Vincent