Re: Few Basic Questions

[Billy Kessler <kessler@xxxxxxxxxxxxx>]

1) After you set multiple data sets exactly what syntax is used to delete or cancel a data set?

SHOW DATA	! will show you what datasets are open (get the number)
CAN DATA N	! where N is the dataset number (can also use the name)

2) Can you designate what file or directory you want a file saved into when using the frame/file command and if so how?

FRAME/FILE=filename.gif

I have never tried specifying a different directory. It might work if
you put the full path and filename in double quotes.

3) When using the "pen = some #" command to designate the color of a feature how can you designate white.  Chap 6, sec 5.1.2 of the ferret user's manual indicates pen number 0 or 1 as black or white but designating pen = 0 does not work.  I am superimposing current velocity vectors over bathymetry contours with multiple color shading as well. 

Pen #19 is white. For contouring white over a color-fill plot:

CONTOUR/OVER/COL=19 variable_name

I have never tried vectors with specified colors, but the documentation
gives two options:

VECTOR/COL=white vx,vy		or VECTOR/PEN=19 vx,vy
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The documentation is really quite good. Try:

http://ferret.pmel.noaa.gov/Ferret/Documentation/

Then click "Users Guide".

Billy K