Nick
try
as.numeric(
strsplit(gsub("[[:alpha:][:punct:][:space:]]{2,}",",",tmpstr),",")[[1]][-1]
)
see ?regexpr for information
HTH
Duncan
Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mac...@northnet.com.au
At 15:06 16/06/2013, you wrote:
Hi all,
I have been beating my head against this problem for a bit, but I
can't figure it out.
I have a series of strings of variable length, and each will have
one or more numbers, of varying format. E.g., I might have:
tmpstr = "The first number is: 32. Another one is: 32.1. Here's a
number in scientific format, 0.3523e10, and another, 0.3523e-10, and
a negative, -313.1"
How could I get R to just give me a list of numerics containing the
numbers therein?
Thanks very much to the regexp wizards!
Cheers,
Nick
--
====================================================
Nicholas J. Matzke
Ph.D. Candidate, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley
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Mailing address:
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1005 Valley Life Sciences Building #3140
Berkeley, CA 94720-3140
-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When
people thought the earth was spherical, they were wrong. But if you
think that thinking the earth is spherical is just as wrong as
thinking the earth is flat, then your view is wronger than both of
them put together."
Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical
Inquirer, 14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
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