[R] help to make a map on R

Magnus Lie Hetland magnus at hetland.org
Wed Oct 2 23:30:51 CEST 2002

Ronaldo Reis Jr. <chrysopa at insecta.ufv.br>:
> Hi all,
> I need a little help for construct an state's map on R.
> The first problem is to get the data.
> I have a datafile of longitude and latitude in the follow format:
> To read a file is simple, but I need that R change the value of
> trajectory after a blank line, reading something like this:
> Each trajectory is a line that is a little piece of my map.

Not sure if this is heresy ;) but this sort of thing would be very
easy to do with a programming language such as Python, Ruby, or Perl
(or even awk) as a preprocessing step.

For example (in Python):

num = 1
lines = iter(open('map.data'))
print lines.next(),
for line in lines:
    if line.isspace():
        num += 1
        fields = line.split()
        fields[0] += str(num)
	print '\t'.join(fields)

Just a thought :)

Magnus Lie Hetland        Practical Python          The Anygui Project
http://hetland.org        http://ppython.com        http://anygui.org
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