[datatable-help] Weird error in package with older data.table version

[Simon Zehnder]

My idea below made everything work … problem solved.

Best

Simon

On 13 Mar 2014, at 09:18, Simon Zehnder <szehnder at uni-bonn.de> wrote:

> Ok, what I found out so far is the following:
> 
> Column 9 (containing characters in the .csv-file) is read first as LGL (logical I think) because the character in the first rows of this column is just ’T’ (and ‘fread' reads T/True/TRUE as TRUE). After some lines there comes a ‘C’ and now this column cannot be anymore logical (LGL) but has to be character. Therefore this column gets bumped and the program stops.
> 
> As the ordering of columns can change in my package I need to tell ‘fread', that it should not consider LGL at all - is that possible? I would like to avoid to bother the user by asking him to provide colClasses. 
> 
> My data sample is always the TRACE data but I cannot know what variables of the TRACE data a user has retrieved. So my only idea to avoid the above mentioned error in my fread would be:
> 
> 1. Read column names via ’scan’.
> 
> 2. Check what variables are in and then choose via key/value pairs the appropriate colClasses and use them in ‘fread’.
> 
> Any other suggestions?
> 
> 
> Best
> 
> Simon
> 
> On 12 Mar 2014, at 20:28, Simon Zehnder <szehnder at uni-bonn.de> wrote:
> 
>> I am having a weird error in a package I wrote some time ago with an older data.table version. ‘fread’ gives:
>> 
>> Internal error: attempt to bump from type 0 to type 1. Please report to datatable-help
>> 
>> The data is the same that I read in before. Any ideas? 
>> 
>> 
>> Best
>> 
>> Simon
>> 
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