[R] how to convert strings back to values?

[Francisco J. Zagmutt]

Examples of the code you used would have helped i.e. We don't know how you 
transposed your matrix.  Did you use t()?  In any event, as.integer() may be 
what you need.

Francisco


>From: Illyes Eszter <illyese at freemail.hu>
>To: r-help at stat.math.ethz.ch
>Subject: [R] how to convert  strings back to values?
>Date: Wed, 9 Nov 2005 21:55:44 +0100 (CET)
>
>Dear All,
>
>It's Eszter from Hungary, a total beginner with R. My problem is the
>following:
>
>I have a dataset with binary values as a comma separated textfile. The
>samples are in the coloumns and the species are in the rows.
>
>I have to transpose it for the further PCoA analysis. There is no
>problem with reading the dataset.
>
>When I transpose the dataset, the original values become strings
>(instead of 0,1,0,0,1 I have "0","1","0","0","1"). The distance matrix
>cannot be counted from the transposed dataset, I have 2 error
>messages:
>
><Warning in vegdist(tdf1, method = "jaccard", binary = FALSE, diag =
>FALSE,  : results may be meaningless because input data have
>negative entries>
>
><Error in rowSums(x, prod(dn), p, na.rm) : 'x' must be numeric>
>
>I do not understand the first, since I have only 1 and 0 in the dataset. I
>guess I have the second because of the strings instead of values in the
>dataset.
>
>Could you please help me solving these problems? I could not find
>anything about these in the manuals.
>
>Thank you, cheers:
>
>Eszter
>
>p.s. This is a new problem, last week I worked with a similar dataset
>and I did not get any error message like these.
>
>
>
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