[R] Ploting graphics using X tints from a color

[Romain Francois]

Le 13.12.2005 19:34, Sérgio Nunes a écrit :

>Hi,
>
>I'm trying to draw a 2D plot using multiple tints of red. The
>(simplified) setup is the following: || year | x | y ||
>
>My idea is that each year is plotted with a different tint of red.
>Older year (lightest) -> Later year (darkest). I've managed to plot
>this with different scales of grays simply by doing:
>
>palette(gray(length(years):0/length(years)))
>
>before the plot and for each year the color used is a different tint of gray.
>
>So, is there any way to do this for any color?
>Any tip or advice?
>
>With this, I hope to visualize patterns in my dataset more easily.
>
>Thanks in advance for any help.
>
>Best regards,
>Sérgio Nunes
>  
>
Hi,

You want to travel in the RGB space.
See http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=107

plot(0, xlim=c(0,10), ylim=c(0,1))
pal <- rgb(1, 0:10/10,0:10/10)
rect(xleft=0:9, xright=1:10, ytop=1, ybottom=0, col=pal)

Romain

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| Romain FRANCOIS - http://francoisromain.free.fr               |
| Doctorant INRIA Futurs / EDF                                  |
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