Re: label the value of a nunmber variable

[Arindam Chakraborty <arch@xxxxxxxxxxxxxx>]

hi Gao,
	the value of a scaler variable is obtained by enclosing it in 
the back-quotes as `variable_name`. Now if you precede this by a ~ 
character, it'll become a string and you can use it in a label 
command. Moreover, you can use the font specification symbols @XY 
where XY is the font type to label the value of that variable.
Here's one example:

! make a sine plot
plot/x=0:360 sin(x*3.1415/180)

! we'll label this variable
let corr = 12/190

! label it, using the default font and precision
label 250,0.80,0,0,0.13 ~`corr`

! now if you want a different font
label 250,0.70,0,0,0.13 @TR`corr`

! and the precision as per your need
label 250,0.60,0,0,0.13 @TR`corr,p=-3` !p=-3 means the user wants 3 
digits after the decimal point.

For more details about font control, look at
http://ferret.wrc.noaa.gov/Ferret/Documentation/Users_Guide/current/Chapter6_Customizing_Plots.htm#_VPINDEXENTRY_762

or precision control, look at

http://ferret.wrc.noaa.gov/Ferret/Documentation/Users_Guide/current/Chapter3_Variables_and_Expressions.htm#_VPINDEXENTRY_517

or label command, look at

http://ferret.wrc.noaa.gov/Ferret/Documentation/Users_Guide/current/Chapter6_Customizing_Plots.htm#_VPINDEXENTRY_721


----------------------------
 ARINDAM CHAKRABORTY
 Department of Meteorology
 Florida State University
 Tallahassee, FL-32306, USA
 Tel: +001-850-6443524 (Off)
      +001-850-5758550 (Res)
 Fax: +001-850-6449642
____________________________

On Sat, 1 Jan 2005, [gb2312] ¸ßÈÙÕä wrote:

> Hi, All
> 
> My problem this time is how to label the value of a nunmber variable on the plot?
> 
> For example:
>   let corr=12/190.
>  
> Now, i want to label the value of corr, and how can i achieve it?  Thanks!
> 
> Gao Rongzhen
>