[R] extra digits added to data

[Mark Harrison]

Thanks for the quick response.

Read the FAQ.  If i want to keep the values in R the same as when inputed should i be converting the data to a different type - i.e. Not numeric?



Sent from my iPhone

On Oct 11, 2011, at 4:46 AM, Jim Holtman <jholtman at gmail.com> wrote:

> FAQ 7.31
> 
> Sent from my iPad
> 
> On Oct 11, 2011, at 1:07, Mark Harrison <harrisonmark1 at gmail.com> wrote:
> 
>> I am having a problem with extra digits being added to my data which I think
>> is a result of how I am converting my data.frame data to xts.
>> 
>> I see the same issue in R v2.13.1 and RStudio version 0.94.106.
>> 
>> I am loading historical foreign exchange data in via csv files or from a sql
>> server database.  In both cases there are no extra digits and the original
>> data looks like the following:
>> 
>>       Date   Open   High    Low  Close
>> 1 2001-01-03 1.5021 1.5094 1.4883 1.4898
>> 2 2001-01-04 1.4897 1.5037 1.4882 1.5020
>> 3 2001-01-05 1.5020 1.5074 1.4952 1.5016
>> 4 2001-01-08 1.5035 1.5104 1.4931 1.4964
>> 5 2001-01-09 1.4964 1.4978 1.4873 1.4887
>> 6 2001-01-10 1.4887 1.4943 1.4856 1.4866
>> 
>> So for 2001-01-03 the Open value is 1.5021 with only 4 digits after the
>> decimal place - i.e. .5021.
>> 
>> I then proceed to do the following in R to convert the 'british pound' data
>> above from data.frame to xts:
>> 
>> Require(quantmod)
>> rownames(gbp) <- gbp$Date
>> head(gbp)
>> 
>>            Open   High    Low  Close
>> 2001-01-03 1.5021 1.5094 1.4883 1.4898
>> 2001-01-04 1.4897 1.5037 1.4882 1.5020
>> 2001-01-05 1.5020 1.5074 1.4952 1.5016
>> 2001-01-08 1.5035 1.5104 1.4931 1.4964
>> 2001-01-09 1.4964 1.4978 1.4873 1.4887
>> 2001-01-10 1.4887 1.4943 1.4856 1.4866
>> 
>> gbp<- as.xts(gbp[,2:5])
>> class(gbp)
>> 
>> [1] "xts" "zoo"
>> 
>> The data at this point looks ok until you look closer or output the data to
>> excel at which point you see the following for the 'Open' 2001-01-03:
>> 1.50209999084473
>> 
>> It is not just the above 'Open' or the first value but all the data points
>> contain the extra digits which I think is the original date data and/or row
>> numbers that are being tacked on.
>> 
>> My problem is the extra digits being added or whatever I am doing wrong in R
>> to cause the extra digits to be added.  I need 1.5021 to be 1.5021 and not
>> 1.50209999084473.
>> 
>> Thanks for the help.
>> 
>>   [[alternative HTML version deleted]]
>> 
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