Re: ppl VECSET and VECKEY commands

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

Hi Vincent,
Apologies to everyone for all the messages on this.  I have one
more thing to note. There is also a qualifier to the VECTOR command
which is simpler to use than the PPLUS commands

   VECTOR/LENGTH=

The length specified is the value of the vector magnitude that you want
to correspond to 1/2 inch on the plot page. 

   VECTOR/LENGTH=8  uwnd,vwnd

is equivalent to using the command  "PPL VECSET 0.5, 8"

The label on the key will be 8, since a vector of magnitude of 8 corresponds
to a vector on the page that is the length of the arrow key.

My previous example:

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

   yes? vector/LENGTH=5 uwnd,vwnd
       !  The key is labelled as 5 m/s

   yes? vector/OVER/LENGTH=10 uwnd,vwnd
       ! Now, 0.5 inches represents 10 m/s so the vectors are
       ! shorter, and the key is labelled 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