[R] how to convert strings back to values?

[Illyes Eszter]

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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