Re: aline

[Mick Spillane <spillane@xxxxxxxxxxxxx>]

Hi Richard,
Your syntax is not correct but, depending on how the initial plot was
drawn, there is another quirk of ALINE that can cause unexpected
results.  Try the following

def axis/x=1:32:1 xax ; def grid/x=xax grd 
let dang=atan(1.)/4 ; let ang=(x[g=grd]-1)*dang 
let x1=cos(ang) ; let y1=sin(ang) 
let x2=2*x1     ; let y2=2*y1 
plot/vs/nolab x2,y2 
let ipen=mod(i,6)+1 
ppl line,1,0,0 
repeat/i=1:32 (ppl pen,1,`ipen` ; ppl aline,1,`x1`,`y1`,`x2`,`y2`) 

Things to note are as follows
1) the syntax, luckily simpler for aline
2) the way you can change pen color, maybe not of use in your problem
3) most important here is the need for "ppl line,1,0,0" in the above.
   The plot/vs/nolab x2,y2 command sets the line style as MARKS ONLY
   which appears to stay in force.  The command "ppl line,1,0,0"
   resets the line style of line 1 to LINE ONLY.

Good luck,
Mick.

PS For further info on PlotPlus and its Ferret-specific enhancements
   see the links on the Ferret documentation page
	http://ferret.wrc.noaa.gov/Ferret/Documentation/

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