[R] export dataframe's column classes to a list

[Alexander Shenkin]

It does indeed!  thank you very much, and thanks to mark leeds as well,
who emailed me off list with a similar solution.

On 5/19/2010 3:49 PM, Peter Alspach wrote:
> Tena koe Allie
>
> Does
>
> sapply(myframe, class)
>
> do what you want?
>
> Peter Alspach
>
>   
>> -----Original Message-----
>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
>> project.org] On Behalf Of Alexander Shenkin
>> Sent: Thursday, 20 May 2010 8:19 a.m.
>> To: r-help at r-project.org
>> Subject: [R] export dataframe's column classes to a list
>>
>> Hi Folks,
>>
>> I want to export a dataframe's column classes to a list so that I can
>> reinstantiate the dataframe from a CSV file in the future.  (I know
>> about save(), which I'm using in addition to this).
>>
>> what I want to do is the following:
>>     write.csv(myframe);
>>     col_classes = get_col_classes(myframe);
>>     write.csv(col_classes, "column_classes")
>>
>>     ... time passes, R gets closed, etc ...
>>
>>     col_classes = read.csv("column_classes")
>>     new_myframe = read.csv("myfile.csv", colClasses = col_classes)
>>
>>
>> My question is how to construct the "get_col_classes()" function
>>     
> above.
>   
>>  Any thoughts are greatly appreciated!
>>
>> Thanks,
>> Allie
>>
>> --
>> Alexander Shenkin
>> PhD Candidate
>> School of Natural Resources and Environment
>> University of Florida
>>
>> http://snre.ufl.edu/people/students.asp
>>
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