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

[Simon Zehnder]

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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