Re: [ferret_users] legend for scatter plot

["William S. Kessler" <William.S.Kessler@xxxxxxxx>]

With regard to the first question (legend for scatter), I still think  
it is very easy to do by hand (maximum 4 commands as below).

For the second question (plot limits), obviously Ferret cannot know  
the min/max until all the lines have been given. So then the problem  
is to control the line colors while giving multiple lines? You can do  
this with the PPL COLOR command:

ppl color,2,0,80,0    ! change pen 2 to dark green
ppl color,3,50,35,5  ! change pen 3 to brown
....

Now you can have any colors you want.

One note is that there can be problems converting to pdf if a line is  
white. In that case do almost white:

ppl color,6,99,99,99

One use for this is to draw white contour lines on top of a color- 
shade plot.

Also see SET MODE LINECOLOR, which lets you have more than 6 line  
colors.

Billy K


On May 3, 2011, at 2:04 AM, Yue Chao wrote:

> Thank you William. I think I must make my question simple and clear  
> by giving example. I'm trying to give an example like this:
>
> yes? plot/i=1:100/set_up/nolab sin(i/5)   ! the first line plot
> yes? ppl plot
> yes? plot/over/i=1:100/nolab sin(i/5)+i/100   ! the second line plot
> yes? plot/over/symbol=27/i=1:100/nolab sin(i/5)-i/100   ! a scatter  
> plot
> yes? go text_legend_put2 65 68 30 "sin(i/5)"                   !  
> text_legend_put2 is another shared script within our lab to add  
> lenged for lines
> yes? go text_legend_put2 65 68 35 "sin(i/5)+i/100"
>
> Now I added the legend for the lines in the plot, but I also want to  
> add a legend for the third overlayed scatter points.
> Maybe there is already easy way for this but I don't know.
>
> Another question is (maybe it's better to give another mail by using  
> different theme title), in the above plot we make, when overlaying  
> plots,
> ferret doesn't know to adjust the vertical limits (min & max values)  
> to  accommodate appropriately the later-coming data and plots. so if  
> you want to
> make several lines in the same plot by using plot/overlay, you need  
> to know the maximum and minimum (absolute) value of all data first,  
> and must use
> plot/set_up/vlimits=`minimum`:`maximum`, and this is tedious.  Or  
> you can also do like:
>
> yes? plot/i=1:100/set_up/nolab sin(i/5), sin(i/5)+i/100, sin(i/5)-i/ 
> 100, but you cannot select the color for lines.
> I hope this is not too long.
>
> Again thank you for your help!!
>
> Chao
>
> 2011/5/2 William S. Kessler <William.S.Kessler@xxxxxxxx>
> Do you mean have two different scatter plots overlaid? (Otherwise  
> you would not need a legend). That is not a common situation so I  
> would do this by hand:
>
> ! suppose your dots are drawn with thick red circles:
> plot/set/nolab/over/col=8/sym=27 {xpos},{ypos}          ! position  
> outside the plot border
> ppl  
> window 
> ,off                                                          ! need  
> this to allow drawing outside the border
> ppl plot/over
> label `xpos+.1` `ypos-.1` -1 0 .14 legend label
>
> BK
>
>
> On 02 May 2011, at 9:50 AM, Yue Chao wrote:
>
> Dear ferret users,
>
> As sometimes we want to draw both line and scatter points in one  
> plot. I know how to add line legend in the plot. but for the scatter  
> point legend,
> Is there any available way for this? as I read through the reference  
> mannual and the mail archives on line, few is discussed.  Thank you.
>
> Chao
>
> --
> ***********************************************************************************
> Chao YUE
> Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
> UMR 1572 CEA-CNRS-UVSQ
> Batiment 712 - Pe 119
> 91191 GIF Sur YVETTE Cedex
> Tel: (33) 01 69 08 77 30
> Portable Phone (Mobil phone) : (33) 07 60 54  23 71
> ************************************************************************************
>
>
>
>
>
> --
> ***********************************************************************************
> Chao YUE
> Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
> UMR 1572 CEA-CNRS-UVSQ
> Batiment 712 - Pe 119
> 91191 GIF Sur YVETTE Cedex
> Tel: (33) 01 69 08 77 30
> Portable Phone (Mobil phone) : (33) 07 60 54  23 71
> ************************************************************************************