scatter plot color gradient

plot(rodrigo$Lat, rodrigo$Long, pch=21, bg=rainbow(3)[rodrigo$Day+1])
legend("topleft", pch=21, pt.bg=rainbow(3), legend=c("Day 1", "Day 2", "Day 3"))

Dear all,

I have a dataset (table) with daily geographycal coordinates
(latitude-longitude) for a fish larvae population that looks like as this:

Day    Lat    Long
0        23.3    47.2
0        23.35  47.0
0        23.4    47.0
0        23.4    47.3
1        24.2    47.5
1        24.1    47.23
1        24.4    47.8
1        24.36   47.85
2        24.5     47.8
2        25.2     48.1
2        25.3     48.2
.
.

In other words: each row corresponds to a single larva position in a given
date.

I would like to plot the trajectory of the whole larvae population
as a simple dispersion  for the entire period studied, but the idea is
that each point has a color according to age (days) in order to
form agradient with the colors of the rainbow . Also, I want a caption bar
(legend)  for the gradient (for example, day 0 = yellow and day 30 = red).

Anybody around can help me out with that, or at least indicate a packege
that may be useful to me?

I acknowlede your attention in advance.

Regards,

Rodrigo
-- 
=8-->=8-->=8-->=8-->=8-->=8-->=8-->=8-->=8-->=8-->=8-->=8-->

Rodrigo Silvestre Martins, PhD
Bolsista FAPESP P?s-Doutorado

Laborat?rio de Ecossistemas Pesqueiros (LabPesq)
Universidade de S?o Paulo, Instituto Oceanogr?fico
Pra?a do Oceanogr?fico, 191. Cidade Universitaria (sala 107-A/B)
Butant? - S?o Paulo/SP, Brasil
05508-900
Tel: +55 11 3091 6549
Email: rodrigo.plei at gmail.com ; ocersm at lycos.com; rsmartins at usp.br

CV Lattes: http://lattes.cnpq.br/5350064124902777

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